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Water Quality

In addition to modelling the generation and transport of runoff flows, PCSWMM can also estimate the production of pollutant loads associated with this runoff. The following processes can be modeled for any number of user-defined water quality constituents:

·      dry-weather pollutant buildup over differentland uses
·      pollutant washoff from specific land uses duringstorm events
·      direct contribution of rainfall deposition
·      reduction in dry-weather buildup due to streetcleaning
·      reduction in washoff load due to BMPs
·      entry of dry weather sanitary flows anduser-specified external inflows at any point in the drainage system
·      routing of water quality constituents throughthe drainage system
·      reduction in constituent concentration throughtreatment in storage units or by natural processes in pipes and channels.

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