Complete one-pass surface drainage system. The TopDrain 1000 is a unique multifunctional machine that trenches, removes spoil, injects sand and re-compacts all in one operation. Designed for sportsfields and golf course fairways, the TopDrain benefits include; material and labor savings, faster processing times and less surface contamination than conventional methods. The sand grid created by the TopDrain is meant to complement the existing drainage system.