Since 1962 the slip plow has been used extensively to improve drainage of perched water tables in Imperial Valley. This implement is a modified soil chisel with a flat plate 8 to 12 inches wide attached to its back from the chisel point to the aboveground portion. The upper section has a V-shaped flare to push loose soil away from the slit opened by the plow. Slits from a depth of 4 to 6 feet are common.

Assistance was also received from the H. B. Murphy Co.