Permaculture education should be in every school, everywhere. If it was, I believe most of the world’s problems could be solved within a decade.

A gentle slice of moon on the star crowded sky of southwestern Madagascar just set gracefully and yet another day is over; we are now in the second half of January 2010.

And what day is today: Monday, Wednesday or perhaps Sunday? We easily lose track when in the field, especially during our prolonged stays – keeping busy in the nursery, forest and the village of Ranobe with several community participatory projects – keeping the momentum of excitement and action. The dynamics are encouraging and there is wonderful energy flowing. Every day is somewhat special; ups and downs along the journey to the ultimate balance. Capacity building is about trust building and about generosity, patience, humbleness as well as discipline. It’s a wonderful lesson for all of us, for ho avy team and for FIMPAHARA.

And what is the fresh news? Ino vao vao? As expressed in Malagasy. Aha… tsisy vao vao, is the universal answer – there is no news (even though there actually are news). In fact, misy maro vao vao – there are many good news in the process of ‘growing for the future’. And so let us fill you on those:

Work in our three native tree nurseries has been truly a rewarding time; reconnecting with nature and sharing the cheerful time with FIMPAHARA members actively involved. It’s been a pleasureable time of nature observations, provided that we are situated between a nice patch of mostly continuous forest in southwestern Madagascar and diverse agricultural land. Our nurseries attract a lot of incredibly interesting wildlife. Spectacular wildlife moments are abundant: we have been observing several local endemic species of frogs, a slim worm-sized transparent skink Voeltzkowia sp. ‘pallida’, about which not much is known, ancient looking dragonflies, beautiful butterflies and their colorful caterpillars, bizarre insects, flies, beetles and even a ‘may fly’ specimen looking quite prehistoric.

The forest is culminating in its green coat refreshed by spectacular flowers of the most bizarre shapes and structures, opening after a couple rain storms, the first just before Christmas and in the first week of January, each yielding about 20 mm. Days have been pretty hot here with maximum of 39°C and up to 70% humidity, so we like to spend our lunch breaks at what we call ‘a la plague’ (on the ‘beach’ of the lake Ranobe) in a shadow of graceful bananas. Since the beginning of January we have a very good track of weather measurements logged by our meteorological station; great tool for long term monitoring of climatic changes.

Trees in our two full-to-capacity nurseries are doing well. New species are germinating continuously and we have been monitoring their growth each month. Replanted trees have each gotten their unique tags for long-term monitoring. FIMPAHARA receives introductions to plant growth monitoring. Ho avy together with FIMPAHARA is finding local solutions to upcoming issues such as nutrient balance and plant survival. We have been supplying the saplings with compost tea, with a solution of local natural insecticides: the soaked bark of katrafay (Cedrelopsis grevei and soaked crushed leaves of neem, Azedirachta indica), keeping the insect herbivores off and strengthening the health of the seedlings; this is part of our nursery maintenance lessons we have engaged FIMPAHARA into.

Creating sunken vegetable beds

Our third nursery’s construction has just been completed we have been filling it up with pots rapidly. It is an extensive nursery, 4m wide and 16m long, with a capacity of more than 6000 pots. At the moment we have 4000 pots waiting for planting in just a few days and we are continuously filling new pots. We anticipate the seed planting will be finished by the end of January – when we will be up to 10,000 pots with growing native plants. This is certainly exciting progress. The children are a dynamic component in that progress; they have been engaged in pot filling and cheerfully carrying bags on their heads. One boy has carried a pot filled with soil on his nose; laughing when we called him ‘mifioky’ (which is the vernacular name for the endemic ephemeral chameleon Furcifer labordi – meaning the one with long nose who can whistle). We have been designing the third nursery to combine natives, food and medicinal plants, using the full potential of the nursery and proximity to the agricultural field for future tree transplanting to agroforestry schemes.

Last Sunday we had an important meeting in the village, during which FIMAPAHRA and ho avy organized a guided tour through the three nurseries, potato cropped land, our two new completed biogas installments, of which the first one has started to produce biogas already, just after two weeks. This is certainly one exciting alternative to the local cooking options – that being open fire and charcoal from the endemic forest wood. One night, returning from the nursery after the sunset, Ondra, our biogas technician grabbed our attention and whispers "come over… I’ll show you something." Taking us to the biogas storage tank, he lit the burner and … a powerful blue flame lightened up the scene. We have natural gas! It’s methane produced by anaerobic fermentation from zebo dung and water.

The villagers were impressed by the flame, and with the fact this may reduce the amount of wood they burn to cook their daily rice. More than 75 members of the community, the local land and land management association (GELOSE), local forest service (SAGE), WWF, the inter-communal association MITOIMAFI, ho avy and FIMPAHARA have gathered to carry discussion on forest protection and sustainable use within the new protected area being finally zoned. All the involved parties have officially approved patrolling against further wood cutting and charcoal making and assist ecological restoration within an area of up to one thousand hectares behind the nursery. This is certainly an incredible step forward with the prospect of sustainable conservation of the unique spiny forest in Southwest Madagascar. We are currently drafting and discussing further agreements between individual parties and discussing the local land policy (dina) for protection and enforcement. The next couple months will be an exciting time to get these documents finalized and implemented.

Along with the nursery works many activities have been carried on in the village through the interactions of ho avy and FIMPAHARA: an effective wood burning mud stove built by ho avy as demonstration has been already replicated in the seasonal home at rice fields, a new well with natural and effective filtering system put in place, language exchange has become popular and we have finally started and are highly energized for building our reforestation center which will be developed over the next month.

Well building

For more information about our progress look at issue three of the newsletter (PDF) of the program ho avy.

Recent photo galleries can be viewed at:

• http://picasaweb.google.com/martina.petru/FinalPicasaNewYear#
• http://picasaweb.google.com/martina.petru/ForNFWebblogging#

Before…

On November 15th, a group of relative strangers gathered on the dry, red dirt of Moloka’i with the same question firing in their minds. How will we create permanent agriculture on this parched, eroded acre of red dust?

Once the proper introductions were made, our fearless leader, instructor Andrew Jones faced the burning question head-on. Both class and client got a quick review of the Permaculture design process before heading out for a site tour. Site conditions (minimal rainfall, soil erosion, landscape slope) and the challenges of a bustling axis deer super-highway bisecting the property were observed then discussed.

The next day’s visit to Perma-farmer Joe Kennedy’s 25 acres provided numerous examples of effective dry land systems. Dragonflies and bees bustled around the shady ponds he created, in sharp contrast to the neighboring expanse of Monsanto-land. We reaped many benefits from Joe’s 20 plus years of dedication to sustainable agriculture, the tastiest being the bucket-loads of produce we harvested from his farm (Sri-Lankan & cholesterol spinach, pomegranates, tropical almond papayas, 2 types of bananas and more).

In the afternoon we focused on water-harvesting techniques and a Baja case study involving heavy swale work. Then we got down to the business of constructing our swale survey tools (A-frame & bunyip) for measuring the contour lines for flagging the initial swale.

The next morning, we reviewed the design for the project and discussed additions including; deer exclusion strategies, water storage and expanding the potential plant species selection. A bustling axis deer super-highway means anywhere from 15-60 deer cruising directly through the site, everyday, looking for grinds. After much discussion, we decided to start planting areas closer to the house, and seeding the outer zones. Later in the week, a visit to the neighbor’s property would inspire us to try their solution to the crop-grinding deer problem; a tall thorny kiawe fence built from abundant on-site kiawe. It was a beautiful example of art in function. The sun-bleached wall of thorny bones, reaching out to protect its green charge. Less than a week after the course was finished, the clients built their own.

After lunch that day, we marked out the remaining swales and designed the kitchen garden using existing materials (relocating heavy planter boxes from the deer roadside rest stop to a space nearest to the well-used kitchen).

The following morning we were up before the sun, and fortunate enough to watch it light up Moloka’i from a friend’s sailboat as we cruised to the outer reef. An hour of snorkeling gave us a chance to appreciate Moloka’i’s blue underworld.

On our way back from the harbor, we contacted four potential earthmovers to carve our swales. We ended up finding Uncle Ray. Not only did we get the island’s best, we got two loads of mulch (free from dump) delivered before the sun went down. We investigated the piping system for grey and black water, working out the diversion of grey water from the leach field to the banana circle. If you’re gonna shower, you might was well grow some food. Wash your hands, water your taro.

After breakfast we were greeted by Uncle Ray, Penny and their heavy machinery. Once they fixed the driveway, they began fixing the site. Two consecutive “banana circles” or mulch gardens in the shape of a figure 8 and the lower swale and part of the second were dug. The swales were mulched and the greywater was re-directed to the mulch gardens. After we investigated the existing irrigation system layout, we walked over to the neighbor’s house in the golden light, waiting for the “green flash” to see their beautiful gardens and meet their magnificent fence.

The next day, at 7:00 am, Uncle Ray and Penny were at it again, completing the second and third swales. From Farmer Joe’s, we collected plant keikis (banana, taro, sweet potato). We rounded the deep pits dug for our “banana circles” and reinforced their outer walls with rocks found onsite. We mulched the pits with waste materials gathered from the site and stomped them down doing our little “danse composte” as we layered in dump mulch. After filling them to three feet above ground level, we watered down our giant stone-lined figure 8 to give the composting process a proper start. After planting the first of the circles with bananas, sweet potatoes and squash, we gave her another drink.

The final day of class was a busy and emotional one. We finished the top and final (or so we thought) swale, collected aged manure from a local paniolo for the kitchen garden, gathered and prepared additional wild-gathered seed for swales, harvested and diluted ocean water for the pre-existing fruit trees and the keikis in our crazy 8. After the course was wrapped up and evaluations were collected, it was so hard to leave this incredible group that instructors and faculty (Andrew, Nichole and I) almost missed our flight home to the Big Island. My last look at those four giant sleeping swales, snaking across the site, filled me with such joy and hope, hope for rain. Most of the students and the clients stayed on to tour Robin and Dano’s world-renowned perma-farm on the East side and get more plants and seeds into the quickly rehabilitating soil onsite.

After the students left, the work continued. First, our inspired clients took it upon themselves to build their own Kiawe fence. Then, ironically, the night the first big rains came in, their good friends, Robin and Dano happened to be at their home just in time to witness the swales fill to the top. The fab four put their heads together and calculated that, from those rains, 75,000 gallons of water was held in the ground instead of being dumped into the ocean where it chokes out the reef with eroded soil.

After the rain, the clients carefully observed the evolution of the swales and made necessary adjustments. They found mushrooms in their swales, a clear indicator of moisture retention. By observing the way the rainwater charged through the swales, they also determined that a fifth swale was needed. So they gave Uncle Ray a call, and got it done. This work was done only a month ago, working with what we had, using local resources – all chemical free. Looks like Permanent Agriculture to me.

One month later…

I’ve learned that Permaculture courses are often more than educational experiences designed to promote sustainable living. When people from varying backgrounds and generations tune their minds and actions into the harmony of a shared goal, a truly moving lesson in human-potential is learned. The teachers, students, clients, locals, contractors, faculty, family, friends and neighbors involved create a great human exchange. In the sprit of such flawless cooperation, we reshaped the earth to position it in time for Molokai’s allusive rainy season. Our clients are comforted in knowing they are now catching and keeping their topsoil. When our minds are focused and our actions are supported, we can move the Earth in beautiful ways.

On that note, I offer my heart-felt thanks to the following people for making this great work possible. To our clients, for their endless support and hospitality. To Farmer Joe for his generous supply of greens and keiki plants. To Angel Frau and her whirling dust devil of a husband for their utter joy of life. To Ali’i Tasi for her great love and dedication to Hawaii and her people. Mahalos to Auntie Bertha, what an honor to meet such a vital and gifted member of the community. To Uncle Ray and Penny for artfully moving the earth to heal the damage done by years of erosion. To Spurdy for having the intelligence and courage to clean (and mop!) the kitchen of the crowded house wearing only an expertly tied sarong. Thank you Nichole and Andrew for mastering the delicate balance of structure and chaos necessary to obtain true knowledge. To the up-and-comers, the bright and ambitious ones who have a lot of work ahead of them; Hunter, Rob, Eric and Laura, thanks for giving a damn and having the courage to do something about it. Mahalo Nui to Uncle Billy. On a magical night at Hotel Moloka’i, his words set the tempo for this great human experience. “You always gotta come from da heart, and Molokai is from da heart”. Good words to live by.

I’m forever inspired by this outstanding group of characters, and I eagerly wait to roll up my sleeves with the next class. At this moment, strangers from strange places unknowingly wait to become life-long friends. Judging by the momentum created from the connections made, I won’t be waiting long. Check the website for up-coming Moloka’i and greater Hawaii courses. Aloha and a hui ho.

* Our hosts/clients Roshani and John Nash wished to be named in the article. Their support and passion for Permaculture was key to getting this important work done. The fifth swale wasn’t done by Uncle Ray, they in-fact hand dug it.

It’s taken a while to find the time to sit down and report on Part B of our earthworks here at Rosella Waters, near Cairns in far North Queensland. Phase I Part A was documented whilst the process was taking place. This latest update however will rely on memory and hurried notes made during the process, together with numerous photos. Large excavations such as the two large dams we constructed in part A are considerably easier to direct and far less time consuming than the finer detail work using smaller machinery as we experienced in putting in Part B.

Once again we had an excellent earthmover that came on the recommendation of the guys who did the two large dams. Sparky, as he is known, is a very knowledgeable and experienced earthmover, having spent a great deal of the last 40 odd years driving a 46 tonne excavator, building large scale dams, roads and “opening up new country”, as the saying round here goes. Now he runs a private earthmoving business and has at his disposal an 85HP bobcat and a 4 tonne mini excavator with numerous attachments. All of the following work was done with these two small machines.

The first part of the process in Part B was to construct a gabion rock wall at the very top of our system, in the gully that feeds our two dams. Previously, we had done a catchment analysis and based on the 1000mm of rain we receive per year, we arrived at a figure of 5,000,000 liters moving through it. We used this figure to calculate levels and engineer our spillways, level sill heights, the freeboard on the dam walls, trickle pipes, lock pipes, etc. The gully in question begins on our neighbour’s property. It is fed from the hill behind it and also from the diversion drains the road department puts in on the dirt road leading to our front gate. The catchment is predominately regrowth after being cleared 30 years ago with two dozers and a ball and chain. The catchment area is not a well functioning bio-diverse eco system and as such there is little water infiltration and a lot of sheet flow that brings top soil/sediment run off into our system. During the wet season of 2008 we did a small trial by hand building a rock wall just inside our fence line to get an idea of how much material would be trapped and how long it would take to fill up. After only 3 rain events, the small rock wall was fully backed up with silt 1.5 feet deep and the moisture remained just under the surface of that material well into our dry season. With that experience and the slight scar constructed at the back of the Lap Pool dam during its construction, we decided on a larger than first thought gabion, to (a) repair the damage caused by the construction of the Lap Pool dam (b) trap silt/top soil and sediment, preventing it washing through our system and ultimately ending up on the Great Barrier Reef, and (c) provide a small scale example of a solution to dry eroded gullies, that run like rivers in the wet, utilizing a “waste” product of local agriculture.

The “waste” product I speak of are the mountains of volcanic rock that many farms in the area have piled up in massive windrows. Farmers spend up to $4000 an acre to pull them out in preparation for planting avocados, potatoes, mangoes, bananas, sugar cane, etc. Rosella Waters sits right on the edge on an ancient lava flow so the farms that surround us are littered with such rocks, some as large as a car down to rocks as small as a grapefruit. We approached our neighbours up the top of the hill, who grow avocados and mangos, and who had recently put in a mass planting of new trees. Prior to that they had a 20 tonne excavator and dump truck working for a week to pull every rock out. They followed this by traversing over the land with a pickup and five workers pulling the grapefruit sized ones out by hand. Anyway, they were more than happy for us to go onto their property and select as many rocks as we liked from the windrows, which they had conveniently separated into different sizes.

Gabion rock wall trapping silt/sediment & top soil

The cost in building the gabion was therefore the time for Sparky to load up the individually selected rocks into his tip truck and then place them one by one with a claw on the end of his excavator arm. The process took two days in total and we estimate that it cost us close to $1800 to build. As we had large rocks to work with we decided against both “keying in” the base of the gabion wall into the side of the gully and constructing a net meshing to encase them in.

The volume and more importantly the velocity of the water coming down the gully in this case didn’t necessitate us doing either. Choosing the largest rocks first, we placed each one exactly where we wanted to create a firm base on which to construct the wall. It was built much in the same way as a dam wall is built, starting out wide at the base, six meters in this case, and tapering up to two meters wide at the top. The height of the gabion is nearly three meters. After placing each rock, Sparky would firm it down, swivel it around until it was firmly wedged. This in itself is more difficult than it might seem and does take time, but it is VERY important to get right. In all, the wall required 7 full dump truck loads of rock to construct. Once the main frame of the wall was complete we got another two loads of grapefruit sized rock which we have since placed by hand to smooth out the top of the gabion, thus providing a great access path across the gully that we can push a wheel barrow across, drive an ATV over or lead a goat and cart. To repair the scars at the side of the back of the Lap Pool Dam, just in front of the gabion wall, we placed some large rocks on the ledge and back filled behind the rocks with some top soil we had had set aside from the construction of the two dams. This was immediately cover cropped with cowpea and a crotalaria variety called gambia pea. All of the seed we used to cover crop was bought from a local seed merchant as seconds, which means there is a low strike rate (around 40%) but at $1 per kilo and having used the correct inoculant, we gained excellent coverage and stabilized the area. It’s important to remember that seed is the cheapest herbicide!

The next element we tackled was the overflow swale and spillway connected to the larger Mushroom Dam at the bottom of the property. We decided that after completing the gabion it would be best to start at the bottom of the system and then work our way back towards the front gate so that by the time it was all done, Sparky could load up and head off without risk of doing any damage with his machinery.

The first swale was only fifteen odd meters in length and had a level sill spillway half way along it that would spread the overflow of the system over a 3 meter wide area right on a broad ridge point, making it very safe to discharge and presenting no danger of causing an erosion gully. The construction of this small element proved to be a major turning point in our working relationship with Sparky. In the end it took the best part of a day to complete, due to a number of factors including our newfound language barrier. There were some important miscommunicated terms that needed clarification as we went: level sill spillway, back cut, swale, swale mound, swale dish, bottom of the swale dish and most importantly LEVEL. The idea that we wanted to construct something that didn’t run and was in fact perfectly level and on contour was quite a paradigm shift for Sparky, as in his words he had “spent his whole life draining landscapes” and what we wanted to do was quite the opposite.

The swale needed to be constructed on a steepish slope and we decided that we wanted it to hold 300mm of water in the base and have the top of the swale mound 800mm high – thus a substantial 500mm freeboard on the swale mound. The freeboard on the dam wall is one meter, so if ever there was a chance of water spilling over it would go over the swale mound first. It is unlikely to occur as we have “over engineered” things, but if it did the swale mound can be repaired with a shovel unlike the dam wall! What we soon discovered in constructing the swale was that due to the slope of the land we just wouldn’t have enough material to make the swale mound as high as we wished. The answer was to dig further up the hill from the back cut, as gently as possible, in a 1:1 cut. We didn’t want to dig too far up the hill so we adjusted the level of the swale mound back to 700mm high and with a three-meter long level sill spillway, the swale mound still wouldn’t be at risk.

First swale constructed leading off the Mushroom Dam

The data records for the region showed that the largest single 24-hour rain event in the last 30 years had been 284mm. We rounded this out to 300mm and built the spillway to be able to deal with ½ cubic meter of water per second. Together with another spillway on the swale connected to the opposite side of the dam wall, we have more than ensured the dam wall’s safety. Another safety margin we designed into the system was a 110mm lock pipe set at the bottom of the Mushroom Dam wall. The lock pipe is 27 meters long and goes right through the bottom of the wall. On the outlet side there is a butterfly valve, which can be opened wide in the event that the spillways aren’t coping. At the bottom of our system, and being our primary aquaculture dam, it also means we can drain this dam if needed. The dam also faces West, which is likely to be the direction of any fire entering our property, so in the event of a fire we have the added security of being able to drain 2.5 mega liters of water in that direction.

For ease of construction we built this first swale with the 85HP bobcat, equipped with a 1.7 meter wide tilt bucket. Time is money with earthworks, so we decided to make the swales a bucket width wide. Sparky started by running across the slope with his bucket following the back cut line we had marked out, corresponding to the high water mark of the dam. The spill was flicked down slope forming the first part of the swale mound. Once we had the basic shape and marked the position of the level sill spillway, Sparky used his tilt bucket to scrape beyond the back cut line up the slope to get the material we needed to gain the swale mound height we were after. We also took quite a bit of material from the area leading onto the dam wall, progressively cutting back to smooth out the sharpness of the cut. Sparky did a great job and we can easily drive through this area and up and onto the dam wall, giving us access to the other side of the property. The swale runs dead level at 300mm deep all the way through, from the exit point at the dam to the end of the swale itself. On the final scraping run we asked Sparky to tilt the blade slightly down slope in the swale dish, meaning that water will be predominated into the swale mound during rain events. With our first swale complete, fully seeded and earthmover trained we we’re ready to attack the rest of the design. Together with a mix of gambia pea, cow pea and pigeon pea we also planted sweet potato cuttings, aibika, cassava, pumpkin seeds, etc… giving us full cover leading into the wet. In the last few days we have started to receive our first rains in 9 months, so now we have a good base in which to begin our major plantings.

The next swale was a short one connected to the opposite side of the dam wall. It was constructed in the same fashion and care was taken again to ensure a smooth driveway leading off the dam wall for ease of access. With not much room to play with within our boundary line, the swale was extended right up to the fence line with our neighbours and the three-meter level sill spillway will serve as discharge of excess water into the creek below, and also as access to behind the dam wall and our Zone IV area of the property.

Moving further up the slope, we then tackled the 25-meter long swale connected to the Lap Pool dam. With this swale we had a few important decisions to make. Firstly it was going to be the Lap Pool’s only swale and only level sill spillway, the overflow from this leading to the Mushroom dam. The placement of this level sill was therefore vitally important as it would be the major source of water that fills the Mushroom dam and we also have future plans for structures connected to the 6m x 3m jetty we placed on the dam. We saw the opportunity for the level sill to be a feature and a potential wet/dry growing area, in close proximity to the jetty and eventual cabin connected to it. We decided to step the overflow down into a further two level sills before it entered the Mushroom dam.

The step down spillways leading overflow from the Lap Pool Dam swale into the Mushroom Dam. Jetty posts in waiting.

In this way, we slow down the volume of water, create further edge and add an aesthetic feature in the process. The level ditches are slightly wider than the level sill on the swale itself and together with generous amounts of cover crop seed, we planted clumps of vetiver grass to further stabilize the area and slow down water flow. We used the same technique on all the level sill spillways. With such an abundance of rock at hand and a couple of quite steep spillways to stabilize, we saw this as our best option. On two steep spillways, we planted out clumps of vetiver grass across the slope, starting at the top and offset all the way down. Then we placed rocks from the bottom up, starting with larger rocks in an arc, wider than the spillway, followed by smaller rocks all the way up the spillway wall face. We left a 200mm space around each of the vetiver clumps and now 3 months later we have a very stable, rock wall face to our spillways, with large clumps of green vetiver grass breaking up the brown.

Back on the Lap Pool swale we asked Sparky to dig ½ meter deep x 1 meter long x ½ meter wide ditches within the swale dish itself. These ditches will hold water for longer than the rest of the 300mm deep swale and as such become growing zones for some wet crops. We now have these ditches planted out with Taro, with water chestnuts on the edges, all of which is shaded by bananas growing at the inside edge of the swale mound.

Lap Pool swale with newly planted Taro and water chestnuts in the pits and banana on the edges.

Again the whole swale was cover cropped with cowpea, Gambia pea, pigeon pea and dotted with cassava, Aibika, sweet potato and pumpkins. The larger long-term support species and variety of fruit and nut trees are now ready to be planted. We had considered putting all of plantings in at the same time but with no rain at all for close to 9 months we decided to get cover crops and shorter term nitrogen fixers going and wait for the beginning of the first rains before putting them in. The earthworks couldn’t be put back to a more appropriate time due to the availability of machinery.

The rice paddy system was by far the biggest challenge. To look at now, it seems all we have done is push a little dirt up to make a wall and dig a couple of holes for the ducks to live near. In a sense that’s true, but the process of constructing the 1:300 diversion drain from the Lap Pool dam to a duck pond connected to a rice paddy (the overflow of which runs along a diversion drain with a 20mm fall over 20 meters, to another duck pond connected to another rice paddy, the discharge of which drops down into a 25 meter long bio-filter which is itself a level sill spillway), dropping water into the Mushroom dam wasn’t that simple! Plus, the overflow of the second duck pond, leads to a short swale with level spillway that drops down to a 20-meter long swale, the spillway of which also drops into the bio-filter before being discharged into the Mushroom dam. Phew.

The rice paddies with bio-filter below. The beach area is on the edge of the Mushroom Dam with the back side of the Lap Pool Dam wall behind it.

A great deal of gravel road base material was taken out of the rice paddy area and we used this to repair/construct a proper ringed access road, our main access road on the property. The road has now been graded correctly so that water will run into drains leading along side it directed to water storages. On the road we have placed 150mm x 50mm x 4 meter long blue gum planks in sets of two, 4 inches apart, at an angle across the road, every 10-12 meters. We first heard of this idea from Rainbow Valley Farm in New Zealand who has the same system on much steeper roads. As water runs over the road it only has a short distance to run before it drops down into these drains that run across the road at a slight angle. By not allowing the water to build up speed over the road surface the material stays on the road rather than down the bottom of the hill, with obvious benefits.

The diversion drain leading to the 1st duck pond needed to fall at 1:300 and be set low enough in the Lap Pool dam so that it was the first water to leave the dam as it filled. We can regulate this fact by capping the end of the 150mm pipe. The level at which we set the150mm diversion pipe was 450mm below the high water mark of the dam which also corresponds to the level of the level sill spillway. That is 150mm lower than the depth of the swale and the level at which water exits the dam into the swale. As I said, setting the pipe at that level ensures we can control when the water heads to the duck ponds. We have a 30,000 L concrete water tank connected to our shed with approximately 100,000 L of potential roof catchment. We needed to decide what to do with the extra 70,000L. In a minor brain wave, we came up with the idea to pipe the overflow through a 90mm pipe down the side of the tank, under the road and into the 150mm diversion pipe with a t-piece. At the entry point into to first duck pond, we have rocked the spill and next to the 150mm diversion drain pipe we have another 150mm pipe under the road that collects all the water in the drain running alongside the road. At the end of the drain along the side of the road we have dug a meter deep silt trap, concreted the base and placed a grill over the top. This will keep silt out of the duck ponds and provide another source of potting mix from the material that does ultimately come from the road.

The main issue we faced with the levels we were dealing with was to get the duck ponds as high up the slope as we could, leaving us room to put in the proposed rice paddies. The duck ponds would end up being quite small as a result and have a 800mm slope at the back of them from the ridge road. We saw this back slope as another opportunity to be creative and decided to step this down in 300mm wide ledges to the high water level of the ponds. The end result is a duck pond amphitheatre on both ponds! This stepped area will be fully planted out with duck habitat and forage, shading the ponds in the process.

Duck ponds at the back of the paddies, connected by a diversion drain. The amphitheatres at the back of the ponds are well cover cropped and stable.

The two ponds are connected by a diversion drain that runs from 1st pond to 2nd pond, with a 20mm fall over its 20-meter length. This isn’t a great deal of fall, but it’s enough. It has meant we have been able to keep the 2nd pond up as high a possible to give us room for the paddy below. The water from the duck ponds are released into the paddies by way of gates we picked up from an old rice farmer up here. They used to grow two crops a season using the channel that leads from Tinaroo Dam as a source of their water. One of the reasons they gave it up was when the cost of water went from $8 p/ML to $18 p/ML. Now they flood irrigate sugar cane instead. We swapped the four gates for a case of beer and made metal plates that slide into the 3mm gap in the concrete gates, to control the flow of water. The same gates are used at the exit end of the paddies, to discharge the nutrient rich water into the bio-filter below before it heads to the Mushroom dam.

The bio-filter that acts a level sill, taking nutrient rich water from the paddies as well as the swale in the background at the base of the chicken tractor system, overflows into the Mushroom Dam.

The two paddies are separated by a meter wide bund and surrounded by a meter wide, meter high bund with a slight grade. All of this will become a growing zone for duck forage, mulch and some soft fruits such as pawpaw and banana. The meter high bunds, once planted out, will become a living fence keeping the ducks in the paddies during the rice-growing season. We plan to grow rice using the integrated rice and duck growing system I had learnt whilst living with Takao Furuno and his family in Japan. Takao is a social entrepreneur with the world economic forum with his rice duck growing system and has an excellent book out through Tagari publications titled “The Power of Duck”.

The short swale connected to the second duck pond drops down into a longer swale, which will form part of our chicken tractor system. This 20 meter long swale lies at the bottom of the contour chicken runs and borders the Mushroom dam. It’ll take excess nutrients from the chicken system and grow some large trees on the north side of the dam, providing shade. Due to this swale being constructed on less of a slope than the first, it was built with the four tonne excavator. Working from the downward side of the swale, the bucket cut on the back cut line and the spill was dropped to create the swale mound. Following Sparky along with the laser we ensured that the swale dish was 200mm level all along. It doesn’t need to be within a mm but it does help to make the dish as level as possible so as to get an even distribution of water along the swale in lesser rain fall events. Obviously the best way to check that level is to fill the completed swale with water and adjust accordingly with a shovel. It is cheaper to do this in your own time than to pay $100 an hour for a 4 tonne excavator to do it.

“Hairy Harry” stands tall on the island at the back of the Keyhole Dam.

The final element to put in was the Keyhole dam at the entrance to our property. We named this pond the Keyhole, as it is the key to the system that connects water on both sides of the property. The Keyhole sits on a central ridge that dissects the property and the idea was to create a small water storage in our Zone 2 area that can move water through either the system described above or to future water storages on the river side of the property, or both. We decided how large a storage of water we wanted and marked out the approximate position of the dam wall for Sparky to follow. We set a target level for our high water and corresponded this to the position of the two swales that were to direct water to the Keyhole via 150mm pipes placed under the access road. The wall was built using the bobcat, layering wetted clay followed by numerous track rolls with the same machine. Using the excavator to dig the hole of the dam, material was mixed using the tilt bucket with me standing close by, hose in hand, making sure there was the right amount of moisture to make the clay bond. Dam and pond walls are all about compaction and with enough of the right clay, a little mixing if the material is good and bad, and the correct amount of moisture, things should seal. We decided to create a small island at the back of the Keyhole as an aesthetic feature, duck habitat and for the fact that the palm we’ve named “Hairy Harry” was too good looking to lose.

Once the Keyhole was built with a 400mm freeboard on it, we set about marking the back cuts of the two swales that were to connect to it. The Mediterranean swale (so named due to quite granite soils in that part of the property) leads out towards the header tank and drops its spill down into the Lap Pool dam. It is connected to the Keyhole via a 150mm pipe, under the road with a slight 20mm drop towards the pond so as to not get stagnant water sitting in the pipe.

The Mediterranean swale connects to the Keyhole Dam via a 150mm pipe under the main access road. The level sill spills water into the Lap Pool Dam below.

The end of the pipe can be capped, if we wish to keep water in the Keyhole dam and direct any overflow via the 150mm pipe under the road on the other side that connects the Council swale to the same dam. We called that one the Council swale because its main catchment comes from a slight improvement to the dirt road the council recently graded. It was graded sloping towards our fence with no drain so in large rain events we would get large sheet flows of water moving through the landscape causing unnecessary erosion. We asked Sparky if he wouldn’t mind creating a little spoon drain 100 meters up to the neighbours gate entrance and directing that water through the culvert under our road entrance. The five meters beyond the culvert to our fence line continued as a drain before entering our property where it then becomes a level swale directing a substantial volume of water through the 150mm pipe, under the road, into the Keyhole dam and ultimately through our entire system.

Considering the volume of material we are likely to receive from the dirt road, we placed a 200mm deep x three-meter wide silt trap just inside the fence line. This can be dug out by hand when necessary. The level sill spillway of this Council swale directs overflow to a gully, which in future may become a dam or a large gabion, subject to future test holes to check for clay content.
Either pipe in either swale can be capped to control the direction of water movement through our system. This small dam feature is something we are really happy with for its aesthetic beauty and complex simplicity in functionality.

This spoon drain runs 100 meters long and will direct a large amount of water through our system via the Council swale that connects the Keyhole Dam.

For our first major earthworks the complexity involved in the design was substantial. It was quite a big undertaking, made even more so by the birth of our second son Dylan smack bang in the middle of it all. At this point I must give special recognition to my darling wife Georgie who at 41 weeks pregnant, kept us fed and watered, took all the photos and spent considerable time standing there with FRED ( Forever Ridiculous Electronic Device) i.e. the lazer level staff and receiver, in 33′C tropical heat. We took close to a year observing the site, designing, listening and talking to others, re-designing and planning the earthworks and the immediate repair work after they’re done. Once the earthworks began, concept became reality and the two can be quite different no matter how good the planning. Each evening after Sparky had left we spent time talking things over and making decisions for the next day’s work. We gave our laser level a really good working over, it has been a great investment; I don’t imagine we could have done all that we did without it.

Now that the mainframe infrastructure is in place, a little water is in the dams and the site is green with cover crops, the system has literally come alive. From seemingly nowhere frogs have descended upon the water storages attracting ever-increasing numbers of birds. The place must look like a red-light sale at a discount store – a hydrated green oasis in an otherwise dry landscape.

Overlooking the system from the header tank. A transformed landscape.

A natural spring we knew existed has started to recharge with the water in the swales from irrigating the cover crops. It moves through the sub-soil leaking out into the side of the dam. Our hope is that this recharged system will help to keep the water level more constant in the Mushroom dam by offsetting any evaporation.

In all, the earthworks took close to two months to complete from start to finish with a total of 16 days of actual earthworks involved. With the start of our seasonal wet season rains upon us, the next three months or more will be spent busily planting, planting and more planting. We know Sparky is coming back when the wet really hits – we made a pact to sit down with a beer together in the pouring rain and watch the system operate in full flight. Through a local NRM group we are also planning an open day, for local farmers to come and see the system. These major earthworks are just the start of a great adventure in the development of our Permaculture demonstration site for the wet/dry tropics of Northern Australia, Rosella Waters.

The partially completed swale is about to be extended.
The drain is near my right foot.

My latest project is a 25 square metre vegetable patch in subtropical Narangba, South East Queensland, Australia. I could choose the site, and although it wasn’t exactly ‘zone 1’, I settled on an area adjacent to the neighbour’s fence. The soil and solar access are good, and the adjacent fence reduced the amount of additional fencing needed to keep out the dogs, the most expensive purchase for the garden. Being out of the way was an advantage because the owners were not completely sold on having a vegetable patch. I was also hoping that the activity would encourage the neighbour to resurrect their neglected vegetable garden, and they did come out to enquire while the garden was being installed. There is hope.

These are all great qualities, but the main attraction was a downpipe from the house that drained onto the lawn. I could catch the water and distribute it along the length of the garden. Even a light shower would contribute. I have observed that apparently heavy showers can fail to penetrate more than a couple of inches of mulch, so I believe getting the water into the soil is important. I marked out the contour, used that as the upper boundary, and dug the swale trough about 20-25cm wide. I also put a few pavers in front of the drain to prevent erosion of the mound if the water came out in a gush. On the first day I did not get around to installing an overflow, and as it happened there was a storm the day after. The swale filled as predicted, but the water overflowed and flooded part of the garden, partly washing out the path.

The drain is at the bottom left, obscured by grass and pigeon pea.
The pavers for erosion prevention and flow restriction are visible.

The next task was to extend the swale away from the garden with a level sill spillway, as done in Geoff’s Harvesting Water DVD, so that the garden wouldn’t be flooded and it would release water gently onto the lawn. It took some time for me to observe this happening. In the meanwhile I heard that the extension was a little lower than the garden section – it was getting small downpours instead of the garden. Even if I leveled it properly the water could be wasted on the lawn. I placed another paver as a dam to the extension. On Christmas day I got to see it in action. The water didn’t gush, but the drain has since been cleaned so it could happen yet. The original garden section of the swale filled up and the paver slowed the water enough to direct it to the garden first. The mulch and absorption in the swale slowed the advance of the water as it moved through, so even with the paver the extension was getting some early water. While the swale was filling up, the water level on the garden side was higher. The spillway worked as designed when full, letting the water cascade down hill.

The swale is full and overflowing via the level sill spillway.

Further observation revealed that during heavy downpours, there was perhaps too much water in the garden. I had not noticed that the driveway and the neighbour’s driveway could feed the swale too. This explains the good soil, as the area is like a fertile valley, collecting water and sediment which is slowed by the grass and absorbed. After extended rains, the water was springing out of the garden and onto the path! A hole made for planting would fill up with water! To make use of this excess water, I’m considering installing another swale further up the hill, wide and shallow to prevent impeding vehicle access to the back yard. This should charge the soil above the first swale, providing a reserve for when the weather dries out.

The garden was a popular attraction on Christmas day. On the left you can see

the bean trellis, prayer flags and escaping pumpkin.

The garden, while it has some gaps in the planting, has so far been a success with only a few disappointments. There has been a constant supply of lettuce, zucchinis, cucumbers, and now some corn. The garden has pests but the predators seem to be keeping them in check after only 2 months. A 1kg zucchini was just harvested, there is a sunflower I can’t reach the top of, and the owners are talking about expansion!

Much more beautiful than lawn!

The ABC just ran an interesting spotlight (video – or transcript here if you prefer) where we learn that one of Yeomans’ properties, ‘Yobarnie’, in Richmond, north of Sydney, is facing ‘development’ that would turn this important historical demonstration site into a housing estate. In the 1950s and ’60s the site attracted busloads of people on weekend tours where observers could see the transformation his methods effected and learn about their implementation.

Yeomans’ methods, which have heavily influenced permaculture design systems, are increasingly seen today as having tremendous potential to not only increase agricultural productivity but also to have a significant impact on reducing atmospheric CO2 concentrations through increasing soil carbon levels.

It’s a sad day when such a site, with not only such historical significance, but also present relevance, would be paved over.

For good measure, here’s a YouTube clip of Darren Doherty showing the before and after effect of a single keyline plowing on his property.

Resources:

• Keyline Plowing with Compost Tea Application
• The Keyline Plan by P. A. Yeomans
• The Challenge of Landscape by P. A. Yeomans
• The City Forest by P. A. Yeomans

We’re pleased to announce that we’re partnering with the makers of the video above, WeForest, to help establish self-replicating permaculture reforestation demonstration sites in accordance with our Permaculture Master Plan, in several worldwide locations – starting in Zambia in the first instance. Our Geoff Lawton has just agreed to be on their advisory board, and we’ll be working to supply guidance, knowhow and staff to pioneer these projects.

This is just one example of the many encouraging collaborative results we get as people boil current events down to their only logical conclusion – discovering we need to quit battling nature and get busy harnessing biological synergies to repair the earth and rebuild sustainable community interactions.

Geoff Lawton and Darren Doherty are the two highest profile people in Australian Permaculture when it comes to broadacre water harvesting earthworks. They’ve both had success in some very tough environments, and yet it’s interesting that their styles are quite different, particularly when it comes to infiltration strategies.

This article is a short comparison of their approaches, along with an idea I had recently for amalgamating the benefits of each.

To help illustrate, I’ve put a set of boundaries on a section of a topographic map (figure 1.1). 

Figure 1.1 – Base Map

I realise that both Geoff and Darren would be salivating as they looked up the hill at the potential dam sites above, but I’ve deliberately left them out of the equation to keep things simple and limit the comparison to their infiltration strategies.

Similarly, although I haven’t marked it in, each of them would put in a small dam/wetland/silt-trap in each of the valleys to dissipate the flow coming on site and prevent their mounds blowing out.

Geoff Lawton’s approach

Geoff’s style for infiltrating water into the landscape is to use swales (often connected to dams but that’s another story). His aim is to catch water as high as he can in the landscape and use the dead level swale to spread the water across the length of the land. This water is held in the swale, giving it time to infiltrate into the soil, and it then plumes downhill, recharging the ground water for the benefit of trees planted below (figure 2.1).

Figure 2.1 – Soil water movement after swale infiltration
See this animation for more details

He often builds his swales with a bulldozer, resulting in a large capacity (eg a bulldozer blade wide and deep as in figure 2.2 – the back and front walls are battered on the subsequent passes).

 
Figure 2.2 - Front view of a bulldozer building a swale 

This is well suited to the sub-tropics where 50-100mm events are common and also in arid areas where the few rain events that occur can be a deluge. A large volume of water is held in the swale, giving it time to infiltrate into the landscape, for the benefit of the trees planted below.

A design constant we can work with is that water flows at 90 degrees to contour, both above and below the soil surface. Each large red dot in figure 2.3 represents an even amount of water that has infiltrated along the length of the swale. The red lines show the path that the water takes as it moves down through the soil profile.

Figure 2.3 Swale infiltration (red) path

Natural water flow in the landscape

A natural pattern in the landscape is that valleys are moist whereas ridges are dry. You can see this in the vegetation in any undulating National Park you go walking in, with lush, moisture loving plants in the valleys, and dry sclerophyll forest on the ridges.

In figure 3.1, each large blue dot represents an even amount of rainwater that has infiltrated into the land above our boundary. The dotted lines show the path that the water takes (90 degrees to contour) as it moves down through the soil profile. This image clearly illustrating why it is that the ridges are much drier than the valleys.

Figure 3.1 – Movement of soil moisture

Darren’s argument against swales in some instances

In figure 4.1 below, I’ve overlayed the swale infiltration path (figure 2.2) over the top of the rainfall infiltration (figure 3.1). As you’ll notice, the swale tends to direct far more water towards the valleys and hasn’t really fixed the issue of our dry ridgelines.

Figure 4.1 Swale infiltration (red) in relation to moisture entering site (light blue)

Recognising this issue, Darren prefers to set out tree lines using a keyline pattern. In this aerial shot of George Howson’s agroforestry property, ‘Dalpura’ (figure 4.2), the tree mounds aren’t on contour but rather they gently slope away from the valleys (the naturally moist areas) towards the ridges (the naturally dry areas), therefore aiming to even out the moisture levels across the landscape.

Figure 4.2 Dalpura tree lines from above

He creates his tree lines using a ripper and mounder, common in forestry plantings, which have a small gutter on the upper and lower sides which help to direct the water.  This is a cheaper and more fuel efficient option than a bulldozer or excavator, and works well in climates where rainfall events are generally consistent but small, such as in many temperate landscapes.

The green dots and arrows in figure 4.3 indicate the infiltration of the keyline mound during a small event. Water has been directed away from the valleys and encouraged to infiltrate on the ridge instead. You’ll notice that when combined with the water naturally moving down through the landscape from above, the moisture distribution is far more even than in the swale in figure 4.1

Figure 4.3 – Keyline mound infiltration (green) in a small rain event

Despite the obvious benefits, one downside I see to this approach is that the gutters on the sides of the tree mounds have a relatively small water holding capacity. If the landscape has dried out significantly, for instance during a long drought, it’s highly possible that the soils will become hydrophobic, and therefore there will be little water infiltrating as it travels along the gutters. During a large rain event, which occasionally come during the summer when moisture is most needed, due to the small capacity of the gutters, only a small amount of water will be held and given time to infiltrate. The rest will spill over the mound and down the ridge (figure 4.4). This would particularly be the case where there is a large catchment above as in the example used.

Figure 4.4 – Keyline mound overflow during a large rain event

(Note: At this point, I should mention that despite Darren’s mounds being smaller than Geoff’s swales, he places one for every line of trees, meaning that water infiltrates right at the base of each tree. Also, in the widescale forestry example of figure 4.2, the pasture in between the rows has been ripped using a keyline plow, which further increases the infiltration capacity. Similarly, when water does spill, it is in the best place possible – right up on the ridge where the water will fan out and have further opportunity to infiltrate)

The comparison in brief

Geoff’s swales – hold plenty of water in a large event but distribute the water less evenly in the landscape below

Darren’s keyline mounds – distributes soil water more evenly across the land, but holds and infiltrates less during a large event.

The keyline swale

With the benefits of each in mind, I came up with a hybrid, which you could call a keyline-swale.

It’s built just like a swale, set out on contour, except that the base of the swale isn’t level, rather it slopes from the valley out towards the ridges.

To build the keyline-swale, pegs are set out on contour. Starting at the ridge, a mark is made on each peg, rising at 1 in 500 towards the valleys. This is the guide for the blade depth (figure 5.1).

Figure 5.1 – Side section view of a bulldozer building a keyline swale

During a small rainfall event (figures 5.2 & 5.3), water is directed along the trench from the valleys to the ridges, where it infiltrates in a very similar pattern to Darren’s keyline mound.

Figure 5.2 Side section of a keyline swale during a small rain event

Figure 5.3 – Keyline swale (dark blue) infiltrating during a small rain event

During a large event, the water would fill up along the length like Geoff’s large swale, however the water depth wouldn’t be constant. One possible benefit of having a greater depth of water out on the ridges is that there will be more pressure here, causing water to infiltrate at a faster rate than it will in the valleys (figures 5.4 5.5). As the water level drops, it will of course infiltrate the remaining water on the ridge.

Figure 5.4 – Keyline swale full

Figure 5.5 – Keyline swale (dark blue) infiltrating during a large rain event

If this was a temperate climate where large rainfall events are rare, on this landscape I would go for a keyline swale at the very top of the property, and then use Darren’s keyline mounds parallel to this down the slope. This means you’ll get the benefits of water being infiltrated at the base of each of the tree rows (by the mounds), hydration of the ridgelines, while also capturing any large flows that enter the property, infiltrating them right at the top of the slope.

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Cam Wilson runs Forest Edge Permaculture Design, a Melbourne based consultancy offering permaculture Design, Education and Implementation. See the website for more details.

Inter-row Eucalyptus saligna (Sydney blue gum) & Casuarina cunninghamiana (river she oak) planted in 2000

I recently had opportunity to visit a Permaculture site called ‘Dalpura Farm’, near Geelong, outside of Melbourne. Although (or perhaps, because) designed by Darren Doherty, the very well known Permaculture designer and teacher, it was dramatically different than your average Permaculture site. Rather than an urban edible garden, or a fruit-/veg-/livestock-oriented rural block, this 140-acre property was all about trees.

It’s an experimental agro-forestry project, aimed at finding the best way to produce a range of commercial products and ecological benefits from trees, with timber production being the primary focus.

I contacted Darren, the designer, and George Howson, the owner of the property, to see what it was all about.

Craig Mackintosh: With Peak Oil issues right at our door, sales of seeds and potting mix are going through the roof. But, with the ‘Dalpura Farm’ project, you seem to be saying we should be thinking beyond just cauliflowers and cabbages. Wood, prior to the industrial revolution, was always the main source of fuel for humanity. Is any of the motivation behind this particular project connected with future resource constraints?

Darren Doherty: Well the focus at Dalpura was from the start influenced by the fact that the developer was an absentee landholder and we had tenants in until just a few years ago…. They showed only a little interest in what we were trying to ultimately achieve so you could say we started at the back gate and have been working towards the back door ever since. Our main priorities were to develop a site that could achieve multiple outcomes, with a particular focus on valuable managed timber plantations and silvopastoral systems following Keyline™ Design methods, where we treat the whole site as one big water catchment rather than concentrate on using technologies such as swales as many in Permaculture do.

The soil is the cheapest place to store water and we have lifted the SOC level on these very poor, laterised Tertiary Gravels (the region’s largest gravel mine is right next door and Dalpura shares its geology!) from about 2% when we started up to around 6%+ which has made a huge difference to the performance of the various plantings on the site, and therefore the water & mineral cycles have improved radically over the whole site where we have done work. This is despite the fact that rainfall has been very much less than average over the period since we started back in 1996.

The world is short of topsoil and that is the foundation of everything and as I like to say, ‘…..we have to be Blue, before we can be Green or Black….’, meaning we need water (blue) before we can photosynthesis (green) and therefore build carbon (black). I have never been one who has focused on resource constraints as such, rather we have always developed low cost solid state systems that would ultimate yield in any situation.

New revegetation planting (2009)

George Howson: While the primary goal of the forestry plantations is to produce high quality, feature grade timber for furniture and joinery, the systems are designed with multiple products and purposes in mind. I had used a number of native Australian timbers as features in a range of energy-efficient, inner-city housing developments in Geelong in the early 1990s, and was keen to grow the timbers myself and promote their attributes. At the time I formulated the brief, and Darren designed the initial systems, the aesthetic qualities of Australian timbers were generally under-appreciated, and I saw an opportunity to do something about it on a very small scale. I was also predicating the future economic and other values on the likelihood that timber supplies from native forests will be progressively locked up, and that small scale farm forestry is a better way forward in both social and ecological terms.

Other intended products from our trees at ‘Dalpura Farm’ include harvesting seed; fire-wood; poles from thinnings for orchard fencing and garden structures; and the possible production of shiitake mushrooms on farm-grown logs. Stock fodder systems are also a core element in future planning, with integrated grazing along Holisitic Management lines an enterprise currently being explored.

Wetland Crossing Dam, a concept developed by Darren Doherty as an alternative to
conventional concrete culvert/end wall. Nothing planted: all self-established
vegetation. Built by Paul ‘Ringo’ Kean in 1.5hours with a D5 in 2007. Acacia
implexa (lightwood) & Eucalyptus leucoxylon (yellow gum) complex (1998)
in background.

CM: I noticed the trees were planted in swale-type formations, except angling up from valleys onto the slopes rather than running on contour. Could you give us more details on this, and tell us the reasoning behind such a design?

DD: There is not a swale on the property. I have never been much for swales in this part of the world or many other places where I can use the geometry of Keyline™. I understand and use swales where I feel they are an appropriate patterning, but find that in plantation (or orchard) settings the use of the geometry of topographic contours is awfully problematic due in large part to the lack of equidistance between contours, leaving turns to often occur within the planting itself: this is a pain to say the least when it comes to management operations.

The lack of equidistance of contours also gives you the following issues:

1. Can’t fit as many units into a given area
2. Can’t obtain tree offset patterning so important in tree system design
3. Much more difficult to set out the design: with Keyline™ geometry you mark one line and then do a series of 90° offsets off of the 1st line.
4. The drift of runoff (on the rare occasion it now happens) towards the ridge in our system at Dalpura is an application of the Keyline™ geometry. The rationale behind the mounds themselves were to increase the internal drainage characteristics of the soils together with water harvesting. These mounds were constructed using two opposing discs attached to the Yeomans Keyline™ Plow which was subsoiling at the same time.

Sometimes I sense that people use & recommend contours because it is an easily transferred technology, whereas Keyline™ geometry requires a much more detailed understanding of topography that is easily and very often confused. Our application of Keyline™ geometry over the years has become very complex down the point where we are able to create completely symmetrical layouts whilst working on curves. This is difficult to do and requires the following:

1. Electronic topographic survey (ie. Total Station) of the landscape
2. CAD layout planning
3. Set-out of the site using Total Station to accurately reflect the CAD design on the landscape

This might sound like a long-winded process to many, but to us it is about optimisation of all of the outcomes we are after. Namely:

1. Client Satisfaction
2. Landscape Harmony
3. Water-use Efficiency
4. System Performance
5. Ease of Management & Harvest

The use of this whole process with Dalpura’s 1998 planting was made even more important by our ground preparation contractors clearing all the scant layer of topsoil in what was an executive decision that was quite disastrous when your soil is basically gravel! So we really started behind the 8 ball when we took the job back from these contractors. This only vindicates the whole process that we ultimately undertook.

Inter-row Acacia dealbata (silver wattle), and regrowth from thinning (foreground)
with Eucalyptus microcarpa (grey box) planted in 1998. Cam Wilson centre.

GH: All the various forestry systems across Dalpura Farm are planted in tree mounds aligned on ‘Keyline pattern contours’, which direct the natural water flow from the valleys or drainage lines out across the slope towards the crest, as per the pioneering work of P.A. Yeomans. The mounds act as mini-swales, intercepting and spreading the rainfall across the site, helping to distribute it more evenly to all the trees. The gutters on the sides of the tree mounds also act as temporary catchments following heavy rainfall events, increasing the efficacy of interception and storage of run-off, & retaining moisture in the landscape for longer.

CM: You had quite a variety of tree species planted. Can you tell us about some of them, and about any particular relationships going on there. And in what other ways does Dalpura differ from your average, conventional forestry project?

DD: There are about 120 species that have been planted at Dalpura overall. In the 1998-2002 plantings we installed around 20,000 trees and about 20 species (I have detailed records at home but am in Mexico at the moment so referring to memory!). Following 2002 we then started to run out of room and we wanted to plant more trees as per our original layout plan of 1996/7, so started to plant out the pastoral areas of the property. These plantings included more non-timber product species along with timber species; plantings that were a Permaculture/Keyline™ spin on J. Russell Smith’s 1927 classic, ‘Tree Crops: A Permanent Agriculture’. I call this kind of thing Keyline™ Mark IV as neither Yeomans Snr. nor Jnrs. ever applied Keyline™ in this way to my knowledge.

The project differs obviously from the industrial forest production where large areas of single species, often with cloned genetics are grown, where often biota are controlled chemically and the whole planting is clear felled at the end of each rotation. At other farm forestry sites it is common to follow a similar process only on a smaller more integrated scale. Here obviously we are integrating and including many species, including fauna and multiple methodologies of both landscape patterning but also management regimes. It’s a lot more complicated that’s for sure.

In the 1998-2002 plantings we were intent on developing a mixed species layout where the various species complexes (typically made of two species in each complex) were placed according to soil type and aspect. We basically decided this from the initial ‘high-level’ planning and then when the rows were prepared and the trees grown and delivered we then made the decisions to ultimately place the trees as a planting team. We had a great crew with us on that job, made up of new and old heads and it was an interesting process that did and didn’t work. What didn’t work was more a function of tree genetics than anything else, plus some pest animal issues as well.

New revegetation planting (2009)

Each complex throughout these systems are composed of a non-legume (all Eucalypts except for Grevillea robusta). In the 1998 systems we experimented with inter-row layouts where we would have the following layout as an example:

The specific intent of this layout (3m x 3m) was to have the fast growing Acacias (either Acacia dealbata or A. mearnsii) grow fast and fill the canopy quickly forcing the slower growing Eucalypts to ‘search’ for the available ‘light well’ and therefore reduce side-branching and improve on their form. This has and hasn’t worked. Though with some of the species we are working with they are very slow growing and their Acacia partners were perhaps too fast, though we are still waiting to see the full effect of this over time.

Otherwise in the 2002 planting we went a lot more ‘conventional’ with the following layout:

This appears to be a much better layout overall and so we are sticking with this one by and large. We have dabbled here and there with interplanted layouts in the main forestry complexes but have found they are more cumbersome when on a larger scale. That said on some sites we have worked with such as at Geelong Grammar School (1999-2000) and at the Shell Refinery at Corio (1999-2001) inter-planting worked quite well.

This kind of layout goes like this:

It all comes down to being what works for the forest ‘sociology’, which is reflected in tree performance and how easy it is to manage the systems especially when it comes time to thin the systems. Then things start to get much more complicated. These are times when you can appreciate why industrial foresters go for single height class, single species systems: but then a forest isn’t made of one species and one height class is it?

In 2000 we planted a paddock with a interesting array of ‘Tree Crops’, most of which were exotic species. This paddock we know as TC8 (all species complexes across the farm are individually codified) and it has three rows of Tree Crops at 5m row spacings every 24m. This system includes classic tree crops such as Gleditsia triacanthos var. inermis (thornless honey locust), Ceratonia siliqua (carob), Morus nigra (black mulberry), Quercus ilex (holm oak), Q. suber (cork oak), Q.robur var. fastigiata (fastigate english oak) plus Cytisus palmensis (tagasaste) and Atriplex nummularia (old man saltbush) as interplants between all of the tree crops. This system had ‘Leaky Hose’ subsurface irrigation installed in 2003 and is going along quite well, except the tagasaste’s have been hit pretty hard by the ‘roos.

From 2004 we were filling in the gaps ‘up the back’ of Dalpura and we decided to get a lot more complex with our plantings in the remaining places free to plant. So this involved very complicated layouts with lots of species: some of which were really pushing the edges of experimentation. Some suffered accordingly as they revealed themselves to not be suited to the site whilst others have thrived and have led to further planting of those species. We also experimented with using very tall plastic tree guards due to the kangaroo predation throughout the property on some of the plantings.

Walled garden and new orchard. Polewood in foreground from 2004/5 thinnings
of 1998 plantings of Acacia dealbata & Acacia mearnsii (late black wattle)

GH: The initial native forestry systems were planted between 1998-2002. They cover ~18 hectares, and include sixteen species of Australian trees (nine species of Eucalypts, four Acacia species, two Casuarinas and Grevillea robusta). Since then we have broadened our species selection, experimenting on a small scale with mixed plantings of Acacias and Northern hemisphere hardwoods (a range of oak, ash, beech, elm, cherry, walnut, liquidamber and many others).

A key long-term goal with the timber plantations is to enhance the soil fertility within these systems, both for its own sake and to enable the growing of a wider range of species 30-50 years down the track. In terms of building soil fertility the purpose was to harness the benefits of interplanting nitrogen-fixing, leguminous trees such as Acacias with Eucalypts and other broad-leafed species. The diverse range of species leads to a richer and more complex mix of minerals and microbial life in the litter layer that is continually forming on the forest floor.

Probably the main difference between our approach to silvicultural management and that of other farm forestry growers is our system of managing the inter-row areas. We allow revegetation to occur naturally between every second row (predominantly pioneer undergrowth species such as prickly ti-tree, hedge wattle, prickly moses and also a range of native heaths, various grasses and ground covers, mosses and lichens…), mulching the alternate rows to maintain access for silvicultural management work and timber extraction. This system mimics a forest ecology, with the various tiers of vegetation performing a range of functions in the system – improving the soil below the surface through root action, and increasing the amount of organic matter deposited as forest litter (leaves, sticks, seed, branches and bark; bird droppings and animal scats…); acting as protective habitat for a greater number of birds and insects; & also reducing evaporation and mitigating the effect of damaging winds on the timber trees etc.

As well as this, we manage the coppice re-growth of hardwood species as a follow-up to our thinning regime, in order to create multiple-aged trees within a uniform-age-class plantation. Ultimately, around five-to-ten specimens of each species will be retained per hectare as semi-permanent inhabitants of the system. They will be used as a source of good quality seed for growing seedlings from that species, and will carry out all the ecological functions that mature trees perform in what will effectively become an analog forest.

Indifferent form displayed on Eucalyptus tricarpa. Poor genetics we think.

CM: As you’re trying things in forestry that might not have been ventured before, you’ll obviously be on an experiential learning curve, discovering some species and design aspects that are working well, and some that aren’t. The time frames involved in growing trees are considerable, so learning what we can from your experience could save people many years of wasted effort and expense. Can you give us some insights from your learning curve with this project. What worked, what didn’t, and what would you do differently? I noticed for example, that some species tended to be a bit crooked, perhaps not so good for using as timber, and some were stunted in growth, etc.

Some of your lessons will be location-specific, affected by regional climate, and also other factors like kangaroos, etc., but some will be lessons that can be applied in other countries and climate zones. Perhaps we should separate these for the benefit of all.

DD: As I have already mentioned the brief was the outset was clear, and George has enunciated it clearly in this interview. Quite a few well known Permaculture practitioners (including: Cam Wilson, Paul ‘Ringo’ Kean, Derek Ashby, David Holmgren and David Griffiths) have worked or advised at Dalpura Farm over the years and found things of interest there. It is a difficult site with its soils and the average rainfall since we started has been much less than average so its not what you would call an ideal site from that perspective. A few have been quite disparaging about what we have been doing, often though they have focused on some of the various system’s misgivings such as those you mentioned.

That said we felled trees in 2003/4 that were planted in 1998 and then ultimately milled and dried these for furniture after that. We have radically increased the biodiversity values of the site due to our layout style and management regime. The bulk of the systems are in good shape and we will continue ad infinitum to obtain timber and forest products from this site. We and others will continue to learn from George’s munificence and the different influences that all of the project’s players have had over the years. The current manager Matty Fahey is doing a great job and I can’t wait to see what the place looks like after nearly a year away. There is so much to see there and it is one of the sites in my portfolio that I learn the most from, and I am not the only one.

Biggest lessons?

• Start small but experiment on the edges and nooks widely
• Go and check out others sites in your region or regions with similar climates
• Do a Master Tree Growers Course (www.mtg.unimelb.edu.au)
• Subscribe to Australian Agroforestry (www.mtg.unimelb.edu.au)
• Join your local Farm Forestry network
• Use high quality tree genetics from mixed, tested provenances
• Work with high quality nurseries
• Ensure high quality ground preparation and prepare a year or two ahead of planting
• Get the fungi going – mycorrhizal when planting and saprophytic when thinning
• Practice silviculture regularly: as our great, late mate Joe Polaischer used to say, "its working man’s yoga!"

Quercus robur var. fastigiata (fastigate oak) silvopastoral system planted in 2000

GH: There is a fair amount of truth in Chou Enlai’s observation that "it’s still too early to tell". We are attempting to create inter-generational forestry systems along the model of Northern European practices starting from a fixed point in time. A number of the trees being planted are not intended to be harvested until well beyond my lifetime, and some past my childrens’ life times as well.

Part of the strategy of Darren’s design thinking was to plant a variety of species which have staggered time-lines from planting to harvest. The Acacia mearnsii and A. dealbata (Late black wattle and Silver wattle) are expected to be ready for harvest at around 15-20 years old, whereas with the River red gums and Red ironbark (Eucalyptus camuldulensis and E. tricarpa) we are looking at 35 years+. And with Californian redwoods (Sequoia sempervirens) and some other species we are probably looking at 80-100 years+.

Ironically, some of the trees exhibiting poorer form which you refer to are ones like Red ironbark and Yellow gum (E. tricarpa and E. leucoxylon), which are indigenous to this area, and adapted to growing in gravelly soils with moderate rainfall. We have found that trees do not respond entirely predictably to new and unfamiliar conditions. Experimentation with a wide range of species often brings surprising results.

Lessons applicable in region: Establishing the plantations on a Keyline layout has been invaluable, and is particularly applicable to lower rainfall regions. Our historical rainfall is around the 24" (600mm) mark, but having experienced a number of below average years since planting, capturing and utilising the available rainfall has been critical in the trees’ development, and, in some cases, survival.

One of the main unanticipated problems has been kangaroo predation on certain species, especially Blackwood and Lightwood (A. melanoxylon and A. implexa), as well as many of the exotic broad-leafed species. We have evolved a guarding system to deal with this predation, using 2m tall plastic guards attached to 7′ hardwood stakes. While the initial capital cost and follow-up labour is not cheap, we have been able to re-use the guards a number of times over.

Lessons applicable almost anywhere: Leaving every 2nd row to natural re-vegetation, and mulching to increase the breakdown of woody organic matter and provide more fungal food for soil biota.

Experiment with a broad range of species, and allow time to observe how they respond to a new environment. For example, Sugar gum and Spotted gum seedlings (E. cladocalyx and Corymbia maculata) were planted close to one another back in 1998. The Sugar gum boomed after the first couple of years, whereas the Spotted gum suffered from frost events in their early years, and were probably about 1.5m tall on average compared to the Sugar gums’ 8-10m after five years’ growth. However the Spotted gum has gradually taken off, and caught the Sugar gum in spite of the initial growth differential.

Close up of the magnificent Eucalyptus tricarpa

CM: This property is 140 acres, but do you think there’s anything the average guy on a quarter acre could be doing along these lines as well?

DD: Forestry can be done anywhere and Geoff’s ‘Food Forest’ video shows that the elements of forestry expand on the view we’ve been putting out there for a long time now: That the structure of forests never changes much wherever you are, rather it is the species that change, though their roles as life forms don’t within each forest. A forest is also made up of more than just the plants: it is a living, dynamic and ever evolving system that includes all of the kingdoms of nature.

As for your ¼ acre block, food forestry will be your best bet due to the practical issues of felling trees for timber production etc. By and large it will be non-timber forest production. That said you can do some very creative kerb-side coppicing for the rocket stove! Urban mixed species, multi-purpose agroforestry in the Zone 3 & 4 landscapes of our urban and peri-urban spaces makes a huge amount of sense as we move into the ‘new carbon’ economy (as opposed to ‘old’ or fossil carbon) where our wastes are cycled locally into a range of high quality products.

Echium candicans (pride of madiera) bee forage avenue planting (foreground) with
Cytisus palmensis (tagasaste) nurse planting in Keyline parkland

CM: And finally, a question specifically for the owner, George Howson: Investing time and money and ignoring potential lost income from the land in the interim takes some determined long term thinking. Can you give us a rough idea of investment cost, and expected returns?

GH: I think that any evaluation of the financial returns on specialty timber growing is ultimately academic, given the extended time-frames we are dealing with before many of the trees are ready for harvesting. Many of the intended returns from this project will not be measurable in economic terms. However, to answer your question as best I can, my underlying assumption has been that farm-grown timber will appreciate in value in excess of CPI over its financial life-cycle, and that the capital value of the property, and increased production potential due to increases in fertility levels, will generate growth in excess of the value of comparable rural land. Unfortunately, I won’t still be around by the time this project is really coming to fruition, and beginning to realise its true economic/aesthetic/ecological/social and farming potential.

One of the hidden benefits of working on a project of this nature has been the development in my own skills and knowledge as a designer. Working with Darren and other people such as Dave Griffiths of Geometree, and watching how systems evolve and develop over many years has been a great education. Very challenging at times, exciting and tremendously satisfying at others, but overall a richly rewarding journey.

Xanthorrhoea australis (austral grass tree) detail

by Sarina Kilham

For several years, I looked at the scrubby bit of grass on our sloping black sand back yard and imagined the amazing garden that could be – if only we had a bit more cash to buy the sleepers for raised garden beds, if only I could build a nice flat terrace, if only I was a big strong capable builder, instead of a student who has trouble hammering a nail in straight.

So the garden stayed in my imagination until last year when our permaculture guru friend Tiny came to stay.

Tiny is a wanderer, a gentle giant – raised on sugarcane plantations in the far Northeast of Queensland. His first taste of permaculture made him question the agriculture he’d practiced his whole life. Tiny became a permaculture convert and has since taken permaculture as far away as Namibia.

Tiny marks the first corner of the mound!

So Tiny considers the scrubby patch of grass, we watch the sun’s movements for a day and that was the last bit of rest we’ve had since – the permaculture mound was born!

Based on the ‘wick theory’ that the plants will take up the moisture they require, the mound is literally what its name implies – the dirt from the ditches created the first layer, followed by horse manure, seaweed, blood ‘n bone, a bit of lime, a 4cm thick layer of soggy cardboard and lucerne. This was all topped off with thick leaves and mulch. To plant, we poked a hole through the cardboard to allow the tap root to go down, threw in a handful of hearty earth and tucked the seedlings in.

The ditches surrounding the mound provide the water and moisture that the mound requires – also layered with plenty of cardboard and mulch, the ditches collect rainwater from the mound and also our greywater. If this isn’t enough in the heat of summer, they receive an extra water as well.

The mound is interplanted – mostly with vegetables and a few beneficial flowers – for colour, shape and size. The tall straight lines of leek contrast with the waving red leaves of beetroot, the broad beans have tiny black and white flowers whilst the marigolds are golden suns amongst the green.

My nieces and grandmother enjoy the mound – it is calming to walk along the ditch harvesting salad from a variety of leafy vegetables. A few snow peas, cherry tomatoes, eggplants and zucchini made the Christmas stir fry.

The mound has brought us closer to our neighbours – curious and amused perhaps at first to see us digging and piling up this huge mound, then appreciative of the idea of permaculture, and now, keen consumers of our excess vegetables and volunteers to help water, raise seedlings or collect paper, manure and leaves for the ongoing ‘mounding up’. It is a cliché because it is so true – homegrown food for nourishing our bodies, it is also nourishing our community.