Artificial Aquifer
Wednesday, October 21, 2009 at 2:52PM
Currently the roads and paths on the farm make up about 5% of the total farm area. These surfaces are used by tractors and vehicles and consist of dirt roads or bare grass. While such surfaces do not produce as much runoff as conventional pavement, the runoff coefficients are considerable (0.82 for dirt roads and 0.3 for grass on a steep slope). If we were to replace these roads and paths with pervious concrete (runoff coefficient of 0.05) with reservoirs below them, we could maintain an artificial aquifer lined with impervious pavement. We would draw irrigation water from this reservoir, hence reducing our consumption of water from the Grande Ronde Aquifer. With the current road and path layout of the farm, we would capture approximately 370 gallons of water per year. The slope of the farm could be utilized to deliver this water through gates and into a drip system to irrigate the crops without the use of pumps. If we find evaporation of water through the concrete to be a concern, we might either cover the road surface with durable plastic sheeting on sunny days or look into the use of a chemical monolayer on top of the water (below the concrete), if it is organic.
It may be desired to collect additional water for delivery to plants since current water consumption is 500,000 gallons per year. To meet this need, the concept could be extended to collect water not only on road and path surfaces, but also other areas not occupied by crops.
Christophe Parroco and Jennifer Johnston
Jennifer Johnston
|
C (dirt road) |
0.82 |
|
C (lawn) |
0.30 |
|
C (pervious concrete) |
0.05 |
|
|
|
|
Road area |
54140.00 |
|
Roads as percentage of total farm area |
4.97% |
|
|
|
|
Annual Rainfall (inches) |
20.00 |
|
|
|
|
Annual volume of water on road surfaces (cubic inches) |
90233.33 |
|
Annual runoff (dirt road, cubic inches) |
73991.33 |
|
Annual runoff (pervious concrete, cubic inches) |
4511.67 |
|
Water captured annually (cubic inches) |
85721.67 |
|
Water captured annually (cubic feet) |
49.61 |
|
Water captured annually (gallons) |
371.06 |
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