Design and Evaluation of Urban Stormwater Management Projects Based on DigitalWater Drainage System

Stormwater management is an important approach to relieve the pressure of urban flood control,to ease water resource shortage and to improve water environment quality.The DigitalWater Drainage System (DigitalWater DS),which combines the geographic information system (GIS) and the stormwater management model (SWMM),can be used for design and evaluation of urban stormwater management project.Because of the comprehensive consideration of weather,hydrology and land use,DigitalWater DS can provide more scientific and systematic support for stormwater management than conventional methods.The simulation analysis in a certain testing area was performed by DigitalWater DS with and without best management practices,such as porous pavements,green roof and detention pond.The results reveal that the overflow is effectively controlled by taking these stormwater management mea-sures,and the total runoff and the total COD loading are decreased by 24.27% and 16.21% respectively.