A subsurface irrigation system includes an athletic field or the like with a length and width equal to the length and width of the official rules for a sporting event or covering an entire agricultural field and with an excavation depth of about 25 to 50 centimeters. The system also includes a generally impervious plastic sheet or the like that covers the excavation and extends upwardly above the sides thereof. A source of water is disposed outside of the field and a plurality of distribution pipes and water distributors are disposed in the excavated area and extend substantially over the length and width of the excavation. In addition, a main channel connects the distribution pipe to the source of water and a plurality of water distributors are operatively connected to the distribution pipes for receiving water therefrom. Each of the water distributors includes an upwardly extending short pipe having a plurality of small holes around its periphery and a plurality of generally hemispherical covers that extend downwardly in the form of a right circular cylinder over the openings to protect the small holes from being clogged by a mass of soil added to the excavation to cover the subsurface irrigation system and support the growth of ground cover thereon.