Abstract
It is important to understand the location of combined sewer pipes with high deposits to reduce CSO pollutant load efficiently, because the sewer solids has a significant influence on the overflow pollutant load during the wet weather. In this study, field surveys were carried out to confirm which types of pipe structure have a tendency to accumulate deposits during the dry weather period. Most of the specified pipes with high deposits by a distributed model were under stagnant flow condition and had high deposits, although the amount of deposit was not verified. Therefore, the specification method of sewer pipe with high deposits was developed based on pipe network data and pollutant transportation calculation using the Ackers and White Equation. A simplified procedure to estimate the amount of deposition during the dry weather period was also proposed.
