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discharge to Bear Canyon Creek. Surface runoff that does not enter the sewers <br /> may go to South Boulder Creek via streets draining to the West Valley Overflow <br /> routes. To simplify the model, the storm sewers are ignored and all of the <br /> discharge is assumed to go to the West Valley Overflow. This assumption does not <br /> affect flows along the major spill routes, but could affect flows on local tributaries <br /> west of Foothills. <br /> The area northwest of Foothills and Baseline is assumed to go to the Wellman and <br /> ' thence eastward. The area draining to the Wellman from Bear Canyon Creek to <br /> Foothills needs to be carefully analyzed. The ultimate South Boulder Creek model <br /> ' needs to be integrated with a Bear Canyon Creek model to determine the correct <br /> flow routing. <br /> The modeling of flows on eastbound Baseline Road at Crescent Drive (east of <br /> Foothills Parkway) is complex. The initial model assumed a one-third split of the <br /> discharge into the Crossover Ditch upstream of Crescent, one-third direct flow <br /> north to Crescent over the Crossover Ditch culvert, and one-third to the Crossover <br /> Ditch downstream of the Crescent culvert. Note that the Crossover Ditch has very <br /> limited capacity west of Crescent, and another split tests this capacity, and spills in <br /> ' excess of the Crossover Ditch capacity to Crescent Drive. <br /> The levee along the Wellman needs to be surveyed. The initial model used existing <br /> ' topography provided by the City of Boulder and very simplified hydraulics. The <br /> topography has only 2-foot contour intervals. A flow split model is needed. <br /> The discharge entering the Dry Creek Ditch No. 2 syphon at 55th Street and the <br /> Wellman Ditch was routed to the ditch on the golf course. This and the spills north <br /> ' of the Wellman need to be routed in a more refined manner as part of future <br /> efforts. <br /> IV - 4 <br />