Abstract
Various pollutants are produced too much in our environment, and they are accumulated on road surfaces, roofs, and open areas or in drainage ways and sewer pipes. These loads are flushed out by runoff water in rainfall and become one of factors of water pollution in receiving water.
For preventing the water pollution and improving the quality of receiving water, it is necessary to control the pollution runoff from non-point sources by some way. For this purpose, it is important that we make clear the runoff mechanism of pollutant from nonpoint sources and estimate the runoff loads quantitatively.
In this paper, we made clear the runoff characteristics of separate sewer systems which is one of ways of runoff loads from non-point sources, and built up the model which express these runoff characteristics. We simulated runoff loads in each rainfall and in each water qualities by our models. We get good results that simulated value by these models almost agree with measured value it will be possible to calculate the runoff loads of the flushing of separate sewer systems in many districts.
