POLLUTANT RUNOFF MECHANISM FROM WATERSHED UNDER THE RAIN CONDITION AND ITS MODELING

Abstract

For effective water environmental management, knowledge on the pollutant runoff mechanism from non-point sources is very important especially under the rain condition. The runoff rate of not only the stormwater but pollutant loads distributed over the watersheds hould be dealt with physically-basedr ainfall-runoffr elationship.
This paper has conducted field observation about the nitrogenous pollutant runoff in the Honmyo river, an A-class river in Nagasaki. The observation results have been discussed from several viewpoints, based on a mathematical model. Finally, developed model has been proven to be available for estimating the diffuse pollution from the watershed.