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Table of Contents <br /> 1 Introduction ..............................................................................................................................................3 <br /> 1.1 A Note on Nomenclature of River Islands' Areas..............................................................................3 <br /> 1.2 Stormwater evacuation path .............................................................................................................6 <br /> 2 Modelling Software and Base Data........................................................................................................7 <br /> 2.1 Basic XPSWMM Configuration .........................................................................................................7 <br /> 2.2 Lake Storage Capacity......................................................................................................................9 <br /> 2.3 Lake Interconnection pipe lengths ..................................................................................................12 <br /> 2.4 Hydrographs and Rainfall Data.......................................................................................................14 <br /> 2.4.1 Scaling based on approximated drawn contributory area .................................................14 <br /> 2.4.2 Scaling based of contributory area relative to lake size ....................................................16 <br /> 3 Model Configurations............................................................................................................................17 <br /> 3.1 Phase 1 nomenclature summary....................................................................................................17 <br /> 3.1.1 Model D..............................................................................................................................17 <br /> 3.1.2 48.......................................................................................................................................17 <br /> 3.1.3 Dynamic (d) and Static (s) .................................................................................................17 <br /> 3.2 New Phase 2 nomenclature............................................................................................................18 <br /> 3.2.1 Alternative 6 (Alt 6) ............................................................................................................18 <br /> 3.2.2 Lake (L)..............................................................................................................................18 <br /> 3.2.3 Version 2.0 (V20)...............................................................................................................18 <br /> 3.2.4 Contributory (ca) and Lake (la) drainage areas.................................................................18 <br /> 3.2.5 Phase 2 Pump Station (PS)...............................................................................................18 <br /> 3.3 List of Modelled Scenarios for Phase 2 ..........................................................................................19 <br /> 4 Results from the Analyses XPSWMM models.....................................................................................20 <br /> 4.1 Maximum Instantaneous Peak water surface elevation and Static water surface elevation..........26 <br /> 4.2 Maximum Peak Water Surface Elevation .......................................................................................26 <br /> 4.3 Maximum stable water surface elevations......................................................................................26 <br /> 4.4 Average Time to a 7 feet Water Surface Elevation.........................................................................26 <br /> 4.5 Peak Duration and Time to Stable..................................................................................................26 <br /> 4.6 Difference between the two hydrograph methods (ca and la)........................................................27 <br /> 4.7 Outfall manifold velocity..................................................................................................................27 <br /> 4.8 Phase 1 impact................................................................................................................................28 <br /> 5 Conclusions............................................................................................................................................29 <br /> River Islands Phase 2 Stormwater Mitigation Rev 2 1 1� <br /> PACE <br />