Combined leaching and sump catch-basin

Claim 1

In a surface drainage system the combination of: a generally cylindrical wall of stone formed in the earth and extending vertically below ground surface level to define a hole of predetermined depth and breadth greater than conventional catch basin dimensions; a pre-cast, reinforced concrete, catch basin of predetermined, oversize height and breadth substantially filling said hole, and of hollow cylindrical configuration, said catch basin having: a solid circular bottom wall; a solid, hollow, cylindrical, lower side wall, of uniform annular cross section upstanding from said bottom wall to substantially half the height of said catch basin, and sealed by a sealing joint to said bottom wall, to form a sealed, unapertured, undrained sump receptacle for collecting drain water, silt, leaves and the like up to substantially half the volume of said catch basin without leakage into the surrounding environment; a solid, hollow, cylindrical, upper side wall, upstanding from said lower side wall and having a pattern of leaching apertures spaced from top to bottom thereof, each aperture extending from the inside to the outside of said upper side wall for leaching cleared water, rising from said sump receptacle up to the level of said apertures, out into said wall of stone and surrounding earth, a sealing joint connecting said upper side wall to said lower side wall and cone and grille means forming an opening at the top of said catch basin for receiving surface drainage.