Patent ID: 6382237
Filing Date: 2002-05-07
Classification: E03B,Y02A,Y10T

Abstract:
A wide area water collection underground water tank comprising:a water tank (11) constituted to be capable of reserving water therein, said water tank (11) being buried underground and having draining means (14) capable of drawing out the water within said water tank (11) from the aboveground position; one or two or more intake pipe (21) having one end communicated with the interior of said water tank (11) from the side portion or upper portion of said water tank (11), and the other end opened into the underground around said water tank (11); a check valve (31) mounted to said intake pipe (21), said check valve (31) being constituted to: allow water to flow from the other end of said intake pipe (21) toward the one end of said intake pipe (21) when the water pressure at the other end side of said intake pipe (21) is equal to or higher than that at the one end side of said intake pipe (21); and inhibit water from flowing from the one end of said intake pipe (21) toward the other end of said intake pipe (21) when the water pressure at the other end side of said intake pipe (21) is lower than that at the one end side of said intake pipe (21); and a water impermeable sheet (19) buried underground and being upwardly and outwardly inclined from the side or bottom of said water tank (11); wherein the other end of said intake pipe (21) is arranged above said water impermeable sheet (19).