In this paper a simple distributed hydrologic model is proposed to determine optimal installation location of LID devices and to quantify their non-point sources reduction efficiency in urban drainage catchment. The proposed model is applied to simulate surface runoff and non-point sources loading on urban drainage based on square cells. In the model, rainfall events occurring at each cell are transformed into surface runoff events by NRCS-CN technique, and non-point sources pollutants which have been built-up at dry period are discharged at wet period by washed-off process. Since the model can represent the drainage flow path explicitly when the overland flow is occurred and moved into the next lower cell, it is possible to look at the effects of the LID facilities positioning as well as the non-point sources reducing efficiency of such facilities.
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