Install sump pump drilled 27 3/8" holes 3" from bottom. Sump comes on for 15-20 seconds. Constantly have 7" of water in sump pit. Should additional holes be drill higher to allow additional water so pump would cycle less. After sump runs water level comes back quickly to 7" level. Have a 1/3 hp zoeller pump original used 1/2 but sump ran for about 5 seconds. Keeps running out of water in sump pit. Pump has a 3" to 7.5" float range.