Get a 3" or 4" semi-trash pump and pump the water out! Float the suction hose on an inner tube so the end isn't sucking up junk from the pond bottom. You'd be amazed at how much water those things will move if run for a long time. I changed the gas tank on mine so I can use an external 6 gallon tank. Oh high it'll run for 12 hr, on low, 18 or so.
