Pond systems shouldn’t be more than 4 to 6 feet deep, and should be drainable. You need a reliable source of fresh water. As a general rule, you need 15-20 gallons per minute per surface acre of water. With indoor or outdoor systems, water must be pumped from a well to get to ...
It corresponds to the water(wetting phase) that is held in the soil by capillary forces against the force of gravity. In hydrology, this is the specific retention(Bear, 1972).The drainable porosity is the specific yield,and the sum of the specific yield and specific retention is the maximum...