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<br /> <br />. <br /> <br />. <br /> <br />Table 1 <br />Sub-basins Location Index <br /> <br />Description of Location of <br />Downstream Point <br /> <br />Sub-basin No. <br />I and 2 <br />1 and 2 <br />3 and 4 <br /> 5 <br /> 6 <br /> 7 <br />8 and 9 <br /> 10 <br /> 11 <br /> 12 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Inflow to IW-l <br />Outflow from IW-l <br />Indian Wash at Highline Canal <br />Patterson Avenue <br />Upstream Study Limit (just north <br />of Grand Valley Canal) <br />Orchard Road <br />Intersection Orchard Road and <br />28 Road <br />North Avenue <br />At railroad tracks - Downstream <br />Study Limit <br />29~ Road Channel Downstream of <br />Highline Canal <br /> <br />In addition to the 12 key <br />Highway 70, the Highline Canal <br />were investigated to determine <br />the flood runoff. <br /> <br />index poi.nts,.. Interstate <br />and the Grand Valley Canal <br />their retarding effects on <br /> <br />The results of the investigation showed that the Indian <br />Wash watershed above Interstate Highway 70 drains to 18 <br />culverts under the Highway in addition to the double box <br />culvert at Indian Wash (Reference 5). Based on an <br />analysis of the culverts flowing full, it was determined, <br />wi th the except i on of the double box cuI vert, tha t the <br />total 100-year discharge would not pass through the <br />culverts, but would pond up behind the highway. It was <br />observed, however, tha t the ponding was only a br i ef <br />occurrence and that the water flowed over the roadway. <br />From this analysis it was concluded that Interstate <br />Highway 70 does not significantly delay the runoff and <br />therefore has little retarding effect. <br /> <br />The Highline Canal, which has a high spoil bank and <br />roadway on the south side, intercepts the runoff that <br />crosses Interstate Highway 70 and diverts the runoff to <br />Indian Wash. This conclusion was discussed and verified <br />wi th a long-time official of the Grand Valley Project, <br />Highline Canal Division. <br /> <br />13 <br /> <br />~., .". --:--~ - -, <br /> <br />". <br />