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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Hydrology Report <br />Upper Box Elder Creek <br />Outfall Systems Planning Study <br /> <br />Contents <br /> <br />Section <br /> <br />Page <br /> <br />1.0 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1 <br /> <br />1.1 Authorization................................... 1-1 <br /> <br />1.2 Purpose............. . . . . . . . . . . . . . . . . . . . . . . . .. 1-1 <br /> <br />2.0 Study AI-ea Description ................................ 2-1 <br />2.1 Topography and Physiography ........................ 2-1 <br /> <br />2.2 Soils............................ . . . . . . . . . . . . 2-1 <br />2.3 Surface Water Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 <br />2.3.1 Stream Characteristics . . . . . . . . . . . . . . . . . . . . . . . .. 2-2 <br /> <br />2.3.2 Reservoirs ................................ 2-2 <br />2.3.3 Diversions ................................ 2-3 <br />2.3.4 Flood History . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-3 <br /> <br />2.4 . Vegetation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 <br />2.5 Watershed Imperviousness . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-4 <br /> <br />3.0 Hydrologic Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 <br />3.1 MajorWatersheds................................ 3-1 <br />3.2 Subwatersheds..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 <br /> <br />3.3 Streams...................................... 3-2 <br />3.4 Hydrologic Models ............................... 3-2 <br /> <br />3.5 Rainfall............ . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 <br /> <br />3.5.1 Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 <br />3.5.2 Rainfall Depths .. . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-3 <br />3.5.3 Hyetographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 <br />3.6 CUHP Modelling ................................ 3-5 <br />3.6.1 Delineation of Subwatersheds .................... 3-5 <br />3.6.2 Imperviousness ............................. 3-5 <br /> <br />3.6.3 Slope ................................... 3-5 <br />3.6.4 Time of Concentration. . . . . . . . . . . . . . . . . . . . . . . .. 3-6 <br />3.6.5 Retention Storage Losses ....................... 3-6 <br />3.6.6 Infiltration Losses. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 <br />3.7 UDSWM2 Modelling. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-7 <br />3.7.1 Conveyance Element Identification Number. . . . . . . . . . .. 3-7 <br />3.7.2 Stream Geometry . . . . . . . . . . . . . . . . . . . . . . . .. 3-7 <br />3.7.3 Roughness .....;.......................... 3-7 <br />3.7.4 Routing Connectivity. . . . . . . . . . . . . . . . . . . . . . . . .. 3-8 <br /> <br />DENlOOISI82.WPS <br /> <br />11 <br />