A STUDY ON INVERSE ESTIMATION OF THE LOCATION WHICH CAUSES INFILTRATION OF STORMWATER IN THE SEPARATED SEWER SYSTEM

Discahrge in sanitary sewer of separate sewer system extremely increases during rainfall. It has been recognized as a source of operating problems in wastewater collection. This is because of the rainwater inflowing sanitary sewer. It has become the cause of lowering performance of pump stations and treatment plants function. In addition, it leads to overflow from sanitary sewer at one or more locations. It is a very important problem to find the location which causes infiltration of stormwater. Conventionally, in order to clarify the location of infiltration water, a large number of flow meter in has been equipped in sewer pipeline network, and they has been discovering the location of infiltration by using their flow rate data. However, this method needs a lot of cost and time. Therefore, this study used time series analysis in order to analyze with relating time series of radar rain and flow. As a result, it was possible to narrow the location of infiltration of stormwater to a mesh size of rainfall data more efficiently.