Hi Cd, well the under drain is a 5 inch perforated pipe with a sock. If our cut is 8 feet, he will go about 12or 14 feet deep. We hook a well point pump to it and start pumping. As for the tie ins, he will leave heavy duty piece of flex pipe on either end so we can hook the pump to whichever end we want. We will pump it to a pond or existing storm pipe or ditch. If you have good ground, you can be 10 feet below the water table and the hole will be dry as can be. He can go 19 feet with that machine so you can dig 15 feet and still be dry.