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' Creek Ditch No. 2, and flow under South Boulder Road to South <br /> Boulder Creek. <br /> Greater South Boulder Creek spillage would overtop the Viele system <br /> and flow onto the freeway. Some portion of this spillage and local <br /> ' drainage flows can be conveyed by the Anderson Ditch to the east to <br /> South Boulder Creek, subject to some spillage to the north at several <br /> points, the first and most significant of which would occur near the <br /> ' Anderson culvert under the Highway 36 eastbound off ramp. <br /> ' 3. West Valley Overflow. Greater South Boulder Creek spillage (than 700 <br /> to 1000 cfs) would flow onto Highway 36 and pass by the Anderson <br /> Ditch, and then largely overflow the Highway 36 barrier and discharge <br /> ' to the north of the freeway on the west side of Foothills Parkway and <br /> travel north, along the west side of Foothills Parkway. <br /> At the intersections of Foothills and Baseline flow is first retarded by <br /> two small storage ponds. Flows such as the 100 year flood can <br /> follow any one of seven routes. Three potentially leave the watershed <br /> along Foothills Parkway to the northwest, two flow east on the lanes <br /> of Baseline and split again to the north through the Country Club Park <br /> neighborhood, and either by culverts under Foothills or over the <br /> roadway to the east storage. <br /> The east storage first discharges by a box culvert which has been <br /> partially obstructed by an earth dike to form a "poor man's" hydraulic <br /> control. The culvert under Baseline directs flow to the Crossover <br /> Ditch, on the north side of Baseline, which then carries flow easterly <br /> to Dry Creek Ditch No. 2 near 55th. However the east storage spills <br /> at moderate flows to Baseline, which then can contribute to and join <br /> spillage from the Crossover Ditch, and add to the spillage through the <br /> Country Club Park subdivision. Reference documents refer to drainage <br /> problems in these areas. These spillages eventually go to the Wellman <br /> Ditch adding to runoff already being carried from Bear Creek and <br /> probably from the three South Boulder Creek spillages following <br /> Foothills. <br /> rAt 55th and the Wellman Ditch, Dry Creek No. 2 and the Crossover <br /> Ditch flows join the Wellman Ditch except for minor flows conveyed in <br /> the Dry Creek Ditch No. 2 undercrossing pipe. The Wellman Ditch <br /> acts as a major collector channel, but can spill flow north through the <br /> golf course and probably at higher flows through the Centennial Trails <br /> and Arapahoe Ridge subdivision west of 55th. <br /> ' II - 4 <br />