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<br />Flood Hazard Area Delineation <br />Willow, Little Willow, and East Willow Creeks <br /> <br />Contents <br /> <br />Section <br /> <br />Page <br /> <br />Section <br /> <br />1.0 <br /> <br />Introduction <br />1.1 Authorization <br />1.2 Purpose and Scope <br />1.3 Mapping <br />1.4 Background Infonnation <br />1.5 Acknowledgments <br /> <br />1 <br />1 <br />1 <br />I <br />I <br />2 <br /> <br />2.0 <br /> <br />Study Area Description <br />2.1 Topography and Physiography <br />2.2 Soils <br />2.3 Reservoirs and Detention Basins <br />2.4 Flood History <br />2.5 Vegetation <br />2.6 Watershed Imperviousness <br /> <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br /> <br />4.0 <br /> <br />5.0 <br /> <br />3.0 <br /> <br />Baseline Hydrology Analysis <br />3.1 Major Watersheds <br />3.2 Subwatersheds <br />3.3 Streams <br />3.4 Hydrologic Models <br />3.5 Rainfall <br />3.5.1 Criteria <br />3.5.2 Rainfall Depths <br />3.6 CUHPF/PC Modeling <br />3.6.1 Delineation of Subwatersheds <br />3.6.2 Imperviousness <br />3.6.3 Slope <br />3.6.4 Time of Concentration <br />3.6.5 Retention Storage Losses <br />3.6.6 Infiltration Losses <br /> <br />8 <br />8 <br />8 <br />8 <br />8 <br />8 <br />8 <br />8 <br />13 <br />13 <br />13 <br />13 <br />14 <br />14 <br />14 <br /> <br />Contents <br /> <br />Page <br /> <br />3.7 <br /> <br />14 <br />14 <br />14 <br />14 <br />14 <br />14 <br />14 <br /> <br />3.8 <br /> <br />UDSWM386 Modeling <br />3.7.1 Conveyance Element Identification Number <br />3.7.2 Stream Geometry <br />3.7.3 Roughness <br />3.7.4 Routing Connectivity <br />3.7.5 Existing Ponds <br />Results <br /> <br />Hydraulic Analysis <br />4.1 Methodology <br />4.2 Results <br />4.3 General Overview of Flood Impacts <br /> <br />16 <br />16 <br />16 <br />16 <br /> <br />References <br /> <br />19 <br /> <br />(i) <br />