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<br />11-5 <br /> <br />" <br /> <br />Bates Lake was an irrigation storage reservoir prior to urbanization <br />in the area. The City of Arvada acquired the land on which the lake was <br />located and has modified the lake such that normally the area can be used <br />as a park. The pond configuration has been maintained within the park and <br />the pond coupled with the inlet and outlet facilities, as constructed, <br />operates quite well as a storm water detention facility. <br />C. Topographic and Geologic Features <br />The relief in the upper portion of the Hidden Lake Planning Basin is <br />relatively severe with slopes ranging from 10 to 15 percent down to 0.5 <br />percent near Sheridan Blvd. The highest point is approximately elevation <br />5640 feet. The nominal water surface for Hidden Lake is elevation 5280 feet <br />and the invert of Clear Creek at the discharge point near Federal Blvd. is <br />approximately elevation 5195 feet. The total length of the Hidden Lake <br />p']anning Basin from the highest point on the basin boundary to Clear Creek <br />is approximately 4.5 miles. <br />The highest point on the boundary of the Bates Lake Planning Basin is <br />approximately elevation 5425 feet. The invert of Clear Creek near Sheridan <br />Blvd. where the Bates Lake basin flows (and Ralston Creek) join Clear Creek <br />is at elevation 5242 feet. The total length of the Bates Lake Planning Basin <br />is approximately 1.9 miles. <br />Geological influences upon the surface drainage conditions are very <br />muted. The only location within the two planning basins that geological <br />factors have affected the surface drainage is on the Clear Creek alluvial <br />terrace where large areas have been excavated to obtain sand and gravel. <br />These ponds do create a routing effect upon the storm water runoff passing <br />through these ponds. <br />