Upgrading the runoff quality simulation model "PWRI Load Model" - Development of the "WSD Model"-

The PWRI Load Model, frequently used urban runoff load model in Japan, was upgraded by taking three approaches; (i) development into distributed model from lumped type model, (ii) incorporating nutrients, and (iii) development of its user interface. Field surveys were conducted to provide data for the development and confirm urban runoff load characteristics. It was confirmed that the Model could explain the phenomenon in a reasonable level in SS, BOD, CODMn, T-N, and T-P.