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analysis April average calibration CALL cent Chain CHEMICAL OXYGEN DEMAND combined sewer overflow combined sewer system data file discharge diversion structures duration Engineering enter the interceptor equipment Fabridam Figure full stalt FWPCA gate and Fabridam hydraulic inches Index inlet hydrograph input data installed interceptor sewer system interceptor system intervals Joint Interceptor line printer locations loss rate major inlets mathematical model maximum method method of characteristics Minneapolis Northwest Minneapolis-Saint Paul Sanitary Minneapolis-St Minnesota River Mississippi River Northwest Interceptor occurred operator orifice outlet overflow volume Paul Sanitary District pervious pipe height plot pollution pre-project pressure rain gage rainfall data rainfall events raingage recorded reduction regulators river monitors river quality monitors routing RTIME runoff Saint Paul samples scanning sense switches sewage station storm flow SUBROUTINE Table telemetry teletype treatment plant trunk sewer TYPE UM-RG un-RG University of Minnesota Venturi meter