Efficient Urban Runoff Quantity and Quality Modelling Using SWMM Model and Field Data in an Urban Watershed of Tehran Metropolis

This study aims to calibrate and validate the EPA Storm Water Management Model from field measurements of rainfall runoff, in order simulate rainfall-runoff process an urban watershed Tehran metropolis, Iran. During after three significant storm events, flow rates, total suspended solids (TSS), phosphorus (TP), Kjeldahl nitrogen (TKN) concentrations were measured at outlet catchment, used model calibration validation process. The performance SWMM was evaluated based on statistical criteria, as well graphical techniques. In this study, a local sensitivity analysis carried out identify key parameters, show that “the percentage impervious surface each subwatershed had most effect output”. Based results, can be judged satisfactory, goodness-of-fit indices for simulating runoff quality quantity are placed acceptable ranges. adjustment obtained variations simulated pollutograph concentrations, pollutant load, peak concentration, event mean concentration (EMC) confirms considerable predictive capability when it is calibrated by using measurements.