Rainfall Harvesting
Wednesday, October 21, 2009 at 1:59PM
It is estimated that our current plot of land will require 500,000 gallons of water annually to support life on the farm. In order to reduce the dependency on the aquifer, it would be beneficial if we could design a way to harvest the rainwater that falls on the areas around the farm that do not require it.
My design idea is to cover the walkways and roadways that surround the farm and run through it with a grated system. Underneath this grating system, there will be a preliminary water containment area. This area will contain a thin layer of oil. The purpose of this layer of oil is to reduce the amount of water lost to evaporation. Since oil has stronger bonds than water, its rate of evaporation is much slower than water. And since oil is less dense than water, it floats on top of the water.
Separate from the first water containment area, there is a stored water area, connected to the main containment area by a flow control valve. It is at this stage that any necessary filtration could be taken care of. By putting the flow control valve at the bottom of the containment area, only the water would be drained out.
Assuming 100% of average rainfall over the grated roadways makes it into the containment area, over 68,000 gallons of water would be harvested. Realistically, taking into account various losses, it is probably more likely that 70% of the water would be contained, which is still almost 50,000 gallons of water (10% of total farm usage).
280’ x 10’ + 340’ x 10’ = 6400 ft2 (square footage of roads/paths)
6400 ft2 x 21.2/12 (average rainfall) = 109353 ft3 (volume of water)
= 68,224 gallons (volume of water)
68,224 x 0.70 = 47756 gallons (adjusted volume of water)
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