It is very important to realize a sound and sustainable water environment at urban areas. In order to attain a desirable water environment, sewage system has aimed to be accomplished, but its final goal cannot easily be obtained for lots of reasons. One of the reasons is, of course, due to the non-point pollutantsources, i.e. the diffusive pollution. Others are due to the careless behavior confusing the wastewater with stormwater, and also to the detachment of sediments accumulated in a sewer system.
In this paper, pollutant runoff mechanism at urban area completely facilitated the so-called sewage system has been investigated, through not only the field observation but also the predictive computation. Estimating the detachment rates of T-N by the equation k=a×R
b×L
c, temporal variation of its concentration can be predicted by a mathematical computation, fairly well. Understanding the pollutant runoff mechanism, effectivemanagement can be executed as a strategy for a desirable water environment.
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