RAINWATER STORAGE FACILITY

PROBLEM TO BE SOLVED: To provide rainwater storage facility in a simple structure, which facilitates its construction, stores rainwater and discharges the stored rainwater smoothly, and removes the sand included in rainwater easily. SOLUTION: This rainwater storage facility is constituted by forming a water conducting groove 22 in a central part by arranging a plurality of rainwater guiding unit members 20A, 20B in parallel vertically and horizontally in a bottom of a water storage tank 1 formed by excavating the ground, forming a rainwater guiding part 2 provided with inclined faces inclined downward toward the water conducting groove 22 on both side, and forming a rainwater storage part 3 by stacking rainwater storage unit members 30 on the rainwater guiding part 2 to store the rainwater in the rainwater storage part 3 through the water conducting groove 22 from a manhole 5 temporarily when it rains, drain the rainwater into the manhole 5 through the water conducting groove 22 from the inclined faces of the rainwater guiding part 2 after it rains, and remove the sediment, mud or the like deposited in the water conducting groove 22 through the manhole 5 by jetting high pressure water. COPYRIGHT: (C)2011,JPO&INPIT