Farming Water: Techno-Dousing & Semi-Terraces
Wednesday, October 21, 2009 at 2:51PM 
We would like to reassess the amount of water we can grab from on site. Throughout the entire site just less than 3 million gallons fall annually. About 70% of that falls when we dont need it (between October and April), and is lost due to runoff and infiltration. We have two applications of water-farming that we think might work, but we will need more information to make a decision.To deal with this issue we would like to obtain detailed information about the farm that can help us in our pursuit to farm this water. We would like to map the subsurface to find out where the hydraulic gradient runs, and how deep. This can be achieved using a Magnetic Resonance Imager (MRI), which might be available through a professor at the University of Idaho, which would kind of be like Techno-Dousing. A map of the subsurface structure would allow us to make a decision on which application we choose. We would also like to better understand the soil and obtain information on hydraulic conductivity, infiltration rates, and other characteristics. This will not only help us choose an application, but will help us model the farm so we can better understand how water is moving through the soil. The computer model that would be simplest to work with and understand would be WEPP; Water Erosion Prediction Project. With a computer model of water movement in the soil, we can have a pretty good estimate of the amount that can be potentially farmed.Our first application would be shallow wells. This will only work if water is collecting under the subsurface in an easily obtainable spot; if the water is pooling 10 feet below the surface at the southern edge of the farm this might be ideal. We might also have to modify this spot to ensure that water stays there, possibly by installing pile walls to trap the water in this location.Our second application would be semi terraces with French drains installed. This option would potentially re orientate the farm along topographic lines, and allow water that collects on the surface and through the substrate to move towards the French drains and be collected centrally through a system of cisterns and finally into a lagoon. This system would not only trap water when it is not needed but would also slow down rain water when it is needed, so we would not get unnecessary run off. Evaporation is a concern with a lagoon, however if we only catch 50% of the water that falls between October and April, we still end up with 1 million gallons, an overwhelming surplus that would mean we could scale back the system in years of heavy precipitation and scale up the system in years of drought. What is still not understood is how necessary this water is to our local watershed. Will we be depriving Paradise Creek of necessary rain-water or will we be just fine? Is this scalable? Would we want such an invasive system? Eric Wegner, Josh Van Wie, Josh Gile
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