An application of the receiving water block of the EPA Storm Water management Model (SWMM) is presented to quantify water quality impacts and evaluated control alternatives for a 208 areawide waste water management plan in Volusia Country, Florida. The water quality impact analyses were conducted for dry‐and wet‐weather conditions to simulate dissolved oxygen (DO), chlorides, total nitrogen (TN), and total phosphorus (TP) in the Halifax Rivers, Florida, a 40‐kilometer‐long tidal estuary located on the Atlantic coast of Florida near Daytona Beach. Dry‐weather analysis was performed using conventional 7‐day, 10‐year low flow conditions to determine a set of unit transfer coefficients which estimate the pollutant concentration transferred to any point in the estuary from a constant unit discharge of pollutants at the existing waste water treatment plant outfall locations. Wet‐weather analysis was performed by continuous simulation of a typical three‐month summer wet season in Florida. Three‐month cumulative duration curves of DO, TN and TP concentrations were constructed to estimate the relative value of controlling urban runoff of waste water treatment plant effluent on the Halifax River. The three‐month continuous simulation indicated that the greatest change in DO, TN, and TP duration curves is possible by abatement of waste water treatment plant pollution.

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The City of Battle Creek, Michigan has the third largest land area of all cities in Michigan. A new comprehensive land use plan was recently adopted to guide development of the undeveloped land area in the City, which represents about 40% of the City. Surface water bodies, including several local lakes, 2 significant rivers, and numerous wetland systems are important natural features providing surface water, recreational, and aesthetic resources for the area. Because the City is on the list to require a permit for the Phase II Municipal Storm Water Discharge NPDES regulations, the Voluntary General Permit adopted by the Michigan Department of Natural Resources (MDNR) was chosen to proactively address these regulations and begin watershed planning initiatives with neighboring communities. The City is located in the Kalamazoo River Watershed which is also being evaluated by the MDEQ to establish a phosphorus Total Maximum Daily Load (TMDL) that may have an impact on the City.The primary objective for this project was to facilitate the preparation of a watershed management plan to address storm water management needs of the region as the City implements its recently adopted comprehensive land use plan. In addition, results of this project will allow the City to gain a Certificate of Coverage (COC) under Michigan's Voluntary General Permit for Municipal Storm Water Discharges, which has been accepted by the EPA as fulfilling the requirements of the Phase II Storm Water Regulations.As a result of performing this project, the City of Battle Creek, Michigan has learned the value of gaining stakeholder input during the watershed planning process, and as a result will form a Steering Committee to guide the implementation of the proposed Watershed Management Plan. The City also learned the value of working with the public school system to evaluate educational and monitoring opportunities. As a result of this project, several students will collect water quality data as part of an independent study program.