Terrace-water ponds are being constructed in Alabama that have as their only source of water supply the “run off” from terraced pastures and crop lands. The water level in the ponds fluctuates, and a maximum of 2 to 4 feet of water is lost by evaporation and seepage during extremely dry weather. A minimum depth of 10 feet in the deepest part of the pond is recommended in order to carry the fish population through dry periods.