RAIN-WATER DISPOSAL METHOD OF SEWERAGS SYSTEM, AND CONSTRUCTION METHOD OF RAIN-WATER DISPOSAL EQUIPMENT AND RAIN-WATER RETARDATION PIPE LINE

摘要

PURPOSE:To automatically separate initial rainwater having increased pollution from rainwater having reduced pollution without using any special means to store them, to reduce the total amount of pollutants to a river, the sea, etc., and to dissolve environmental pollution. CONSTITUTION:A low level weir 3 having a height corresponding to the water level caused by initial rain and a weir 4 higher than the weir 3 are provided to part of a sewerage pipe line, and sewage by the initial rain is over flowed from the low level weir 3 to keep it into the first rainwater retardation equipment 5. The first rainwater storage equipment is filled with water, and after it is overflowed from the high level weir 4, the sewage is kept into the second rainwater storage equipment 6. After that, the water in the storage equipments is separately disposed.