The Detroit Water & Sewerage Department (DWSD) collection system and WWTP serves the majority in Southeastem Michigan. This collection system has been modeled in detail since 1987. The primary model used for these evaluations has been the US EPA Stormwater Management Model (SWMM). While this model provides significant capability, the combined sewer evaluations performed for this area have required modifications both to the methods used to prepare the model and changes to the calculations performed by the model. This chapter highlights the changes that have been made to the model to provide an appropriate evaluation of the collection system performance. Many of the new features added to the SWMM model have been driven by the need to evaluate different methods to control combined sewer overflows. Some changes were required by the sheer scope of the modeled area and by the complexity ofthe collection and treatment system. The changes made include better methods to simulate flow routing; improved algorithms to simulate dry weather flow (DWF), rainfall dependent inflow/infiltration (RDIII), and their seasonal variation; better methods to evaluate regulators, outfaHs, and storage; and finally, better fonnats used to present the output to fairly evaluate t~e different con.sidered. Miilly of these ,.
An accurate dye dilution testing protocol using Rhodamine WT was developed and used to quantity flow meter accuracy in the Greater Detroit Regional Sewer System. Over 150 tests were performed on 3 7 flow meters in conjunction with a set of good metering practice principles. A summmy of the accuracy for each of the seven technologies tested before and after good metering practice is given. The seven technologies assessed are electromagnetic induction meters (magmeters
Specialized sampling equipment and ultra-clean analytical methodology were employed to quantify the concentrations or fluxes of mercury (Hg), cadmium (Cd) and polychlorinated biphenyl (PCBs) in ambient air, precipitation, runoff, sanitary sewer, and wastewater treatment plant (WWTP) influent. The relationship between the atmospheric deposition and runoff on controlled surfaces were explored for the three pollutants. The impact of the atmospheric deposition and runoff to the headwork loading of the WWTP were investigated. Atmospheric deposition was found to be the primary source of the mass of Cd, Hg, and PCBs in runoff from the controlled surfaces. Neither atmospheric deposition nor the runoff was the main sources of the three pollutants to the Detroit Wastewater Treatment Plant (WWTP). Wet weather flow contributes the main portion of the Cd, Hg, and PCBs loading to the WWTP.
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