SMALL RAINWATER TANK FOR REMOVING FOREIGN MATTERS FROM RAINWATER AND INFILTRATING RAINWATER UNDER THE GROUND

摘要

PURPOSE: A small rainwater infiltration tank is provided to perform sewage disposal actively, and to reduce the size of the rainwater tank by using the small rainwater tank without using the large collecting layer and eliminating pollutant from rainwater. CONSTITUTION: A small rainwater infiltration tank(1) is composed of a pre-process water tank(3) temporarily storing polluted rainwater from a rainwater inlet pipe, a leak structure(4) slowly leaking rainwater from the pre-process water tank, a post-process water tank(5) collecting rainwater from the leak structure, and a trap structure(6) installed in the middle of the post-process water tank to discharge rainwater out of the post-process water tank by flowing up and down rainwater from the post-process water tank. A sudden stop structure is formed in the pre-process water tank to suddenly stop flow of rainwater from the rainwater inlet pipe, and heavy foreign matters are separated from light foreign matters among rainwater with sudden stop.