An underground system for supplying water to and removing water from an athletic facility having a surface which is susceptible to excessive moisture and dryness. The system includes a plurality of substantially level watering grids positioned in a layer of aggregate material below the surface of the athletic facility. The watering grids provide an arrangement of consecutive watering zones which extend across the athletic facility from one end thereof to the other. Each of the plurality of watering grids includes a plurality of parallel perforated lateral pipes which are connected at opposite ends thereof to header pipes. The plurality of substantially level watering grids are positioned at a substantially equal level below the surface of the athletic facility, regardless of the slope thereof. The system may be installed into existing athletic facilities without excessive damage or disruption to their surfaces.
