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III I I I I I I I I I I I I I I I I I I . Refine SWMM model for spills and hydraulics [H] determined above and storm sewer capacities as may be determined. . Calibrate to known data, and refine modeling of [H - M] urban watershed subbasins; compare to other studies with SWMM and CUHP modeling. . Revise all Corps SWMM modeling below Gross [H - M] Reservoir with emphasis on realistic overland flow lengths, infiltration/detention characteristics per UDFCD or as may be determined, realistic channel lengths, geometry and roughness characteristics. Note that it may be simpler and more reliable to use the HEC-' program for the above tasks. . Review Eldorado gauge data and Gross [M] Reservoir operating statistics, verify reasonableness of mountain modeling below Gross, calibrate if possible. . Provide basic UNET or other realistic stream [H - M] flow routing model from Highway 93 splits, with a main channel path following South Boulder Creek and a West Valley path, with simplified conveyances for interconnecting channels with small flows (i.e., less than 400 cfs). Input SWMM major subbasin hydrographs. (Note that we have hypothesized that while major subbasin hydrology will rise, realistic channel routing may attenuate these effects along the main flow paths.) F. Limited Geomorohic Analvsis The propensity for the South Boulder Creek [H] channel to aggrade (rise) or erode the bank at the spill upstream of Highway 36 and lead to increased spillage should be investigated. This would specifically involve the area above Highway 36 to upstream of the upper levee and generally include consideration of sediment transport through the reach up to Highway 93. V-6