Study of Plant Effluent Mixing & Outfall Location Selection for MCES South Washington County Wastewater Treatment Plant

Abstract

The focus of this project was to select a range of options for positioning of the new sanitary treatment plant outfall at the soon to be expanded Southeast Regional Plant owned and operated by the Metropolitan Couricil Environmental Services (MCES) of the Twin Cities Metropolitan area of Minnesota. This first phase of the multi-phased selection process was developed to provide a riverine hydrodynamics basis for site selection. This project used available information on river topography and historic stage and discharge records to evaluate a range of site options for the outfall. By providing a range of suitable options, the results contained in the report can be used in later phases of the outfall design when final siting will address such issues as pipe and outfall construction concerns, mussel beds, or other issues as they arise. Based on general navigational concerns, a specific outfall location was recommended to MCES for further evaluation.