KEEPING TREATMENT SYSTEM OF PRIMARY STAGE RAINWATER FOR VALLEYWATER USING THE WATER-STORAGE TANK

摘要

PURPOSE: An initial rainwater storage treatment system for valley water utilizing a water storage tank is provided to prevent accumulation of foreign substance and to prevent a bad smell according to initial rainwater in a valley waterway by collecting initial rainwater. CONSTITUTION: An initial rainwater storage treatment system for valley water utilizing a water storage tank comprises a fishway, a gravel trap, a first opening and closing plate, a second opening and closing plate(30), a storage tank(40), and a sediment manhole(321). The fishway is partly laid by separately exposing one end to a wall of a falling crest weir and the other end to upstream of a valley waterway(10). The gravel trap is installed in the upstream of the fishway. The first opening and closing plate discharges initial rainwater to the valley waterway and discharges the valley water which is collected inside a first storm overflow chamber by being installed in the first storm overflow chamber generated in the downstream of the fishway. The second opening and closing plate discharges rainwater to a stream through the valley waterway and collects the initial rainwater in a second storm overflow chamber by being installed in the second storm overflow chamber generated in the downstream of the first opening and closing plate. The storage tank is connected to the second storm overflow chamber through a first connection pipe(32) for inflow of the initial rainwater which is collected in the second storm overflow chamber. The sediment manhole is installed in the first connection pipe in order to prevent that gravel and sand flow into the storage tank.