Nearshore model for Cleveland CSO remediation design selection

Three models were combined to analyze the fate of Combined Sewer Overflows (CSOs) in the Cleveland, Ohio area. Firstly, a 20 year hindcast of Lake Erie was used to find design storms by calculating the state of the receiving water. This study was done as part of the Great Lakes Forecasting System. Secondly, a nearshore model was developed to calculate the local flow fields in the Cleveland area. Lastly, the storm runoff was calculated using a series of models that describe the complex storm water runoff and combined sewer flow in the Cleveland area. These models include sewer models and receiving stream models. Eleven inflow sites from the local Cleveland area were included as sources of storm water discharges to Lake Erie. The nearshore model acted as the link between the land based models for inflows and the Lake Erie model. The nearshore model was driven by the lake model and was used to transport the inflows provided by the land based models. A series of experiments was designed to simulate various containment and treatment scenarios. The nearshore model calculated fecal coliform concentrations for three public beaches in the test area. The resulting concentration maps serve as a guideline for Cleveland CSO remediation design selection.