Creating Swales & Berms Using Plows

We don’t have access to a variety of digging machines here (only to a stadard tractor with a front loader + diggins spoon) so these pictures caught my attention – digging swales and berms using a tractor with a combination of plows:

… and water it holds:

Three terms I found mentioned in the forum thread where I found this

  1. The moldboard plow sounds like something that is typically used by farmers in our area to break-up soil.
  2. I have not been able to find much formal informatn about a “drag blade plow” but as I understand it is used to move the soil after it is broken up by the moldboard plow.

So it is about repeting numerous cycles of loosening and shifting … how many cycles depends on the depth and width of the swale and the number of blades on the plow.

 

 

Provision Transylvania: Lars and Robin

Lars and Robin are a beautiful couple I’ve had the pleasure of meeting a few times who live in Alunisu (on the other side of Cluj). In this interview Lars does what he does so well … gently and compassionately painting a comprehensive picture of where we are and where we can choose to go from here.

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“Imagine if the financial sector would expand the definition of returns … and beside the financial return would also look at return of happiness and well-being of man and nature, then you can make money and capital into an instrument that serves the society.”

Earthbag Cellar Level 8 and 9 and Backfilling

We’ve completed levels 8 and 9 …

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… on level 9 we were joined by Itsik and Yifat who visited with us for a week … so we reached and celebrated the end of 9 together.

 

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In level 9 we also put in additional vertical reinforcement by pounding in rebars into the longest stretch of buried wall that we have (~6 meters)  … and we will continue to do that in an interlaced pattern to give the wall some more strength to resist the weight of the earth piling up behind it.

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Which brings us to today … soil … we called the excavator back (marking what is probably the half-way point of wall construction) … to start backfilling and bringing some more soil to our mixing station (so that I don’t need to carry it in a wheelbarrow). Yesterday we prepared by pulling the plastic covering over the walls   20161010_095944

.. and so it started … and very quickly the corner behind the first retaining wall was filled up ….

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… then the side and rear corner20161010_110123

… during the backfilling, a new soil pile near the mixing station started to appear

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… and before you know it (almost three hours later) the backfilling was complete …. so from the outside we are back at ground level (which does make some maneuvering on the walls easier)

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… and a huge pile of soil (30+ cubic meters) is now blocking the entrance and hiding the site … when that soil is gone, construction of the walls should be complete (or very close to completion)

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As the work progressed we realized we were going through A LOT (= surprising amount) of soil … we’ve used up most of the free soil on and around the site … and it doesn’t look like what we have left will be enogh to complete backfilling and covering the structure. At first this felt like a potential problem … but it quickly transformed into opportunity. It looks like the supply of soil needed to complete this project will overlap and lead into the next project. One option weve been discussing is a small lake (a whole other story). Another option is to start excavating what may be the next construction project … either way … it left us with a pleasant sense of continuity 🙂

Earthbag Technical Report from Nepal

Good Earth Nepal has published this PDF on its site.

Before presenting some highlights I would add that there are a few details which, to my understanding are only correct in the context of typical above ground houses, less so with bermed or underground structures.

“At present, there are over 15,000 Earthbag buildings worldwide with recent Earthbag  constructions gaining approval under strict US building codes.

An estimated 55 Earthbag structures built in Nepal survived the 2015 earthquake, in regions ranging from Solokumbu to Sindhupalchok to Kathmandu.

… The main material of an Earthbag structure is ordinary soil obtainable at the worksite.

… A study by the U.S. Federal Highway Administration found that the half -life of polypropylene fabrics in benign environments can be 500 years or more. The
bags themselves have a tensile strength even higher than that of steel, and can resist circumferential forces generated from the weight above.

… An Earthbag building uses its own weight to anchor itself to the rubble trench foundation. Since the superstructure is not attached to the foundation by bolts or rebars, the foundation and the
superstructure are able to move independently minimizing the shock transfer to the walls. A rubble trench is also built of individual units rather than a continuous beam further absorbing the shock.

Earthbags are resilient. As per an experimental study on vibration reduction … Earthbags have a relatively high damping ratio with horizontal as well as well as vertical vibrations effectively reduced.

… All of these components make Earthbag structures extremely earthquake-resistant. Tests done in accordance with IBC standards have found that Earthbag construction far exceeds Zone 4 standards, devised to protect against the very highest level of seismic activity. Numerous Earthbag structures have been built in the United States. Earthbag structures are permitted by the California Building Code, the toughest in the United States due to high seismic activity.”

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Earthbag Cellar: Level 6 and 7 Done

After finishing level 6 we ordered another batch of sand (another 6 cubic meters, like the first batch).

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… and it was delivered just as we were getting started on Level 7 (because of tricky vehicle access to our property it came in two batches of 3 cubic meters) … this is the second batch being delivered with the first one in place:

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Layer 7 was relatively smooth sailing … that is with uninterrupted and continuous bag laying … also the overall wall length is shortening as both of the retaining walls are starting to shorten:

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This weekend I was alone and so could not progress with construction so I focused on preparing soil for the next two layers (I hope):

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We’ve pretty much used up the entire side-hill that was created during excavation. I pulled down 45 roughly sifted wheelbarrows of soil. You can see the soil pile that I’ve prepared behind the sand pile. That should allow us to make good progress with mixing and packing the next two layers. Its a tough job … and I hope I’ve seen the end of it .. at least for a while. After the next two layers we want to bring in the excavator to do some backfilling and to collect a large pile of soil next to the sand-pile … that should take us nearly to the end of the earthbag phase of this project

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We’ve had a fairly long stretch of work without rain interruption … but that is about to change. I’ve pulled the  plastic that will cover the walls, over the walls … and later today will go out and layout more tarps to keep the site as dry as possible.

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