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<br />III-2 <br /> <br /> Study Area Basin Change <br />Original Basins 2747 acres (4.29 sq. mi.) <br />Additional Area 475 acres (0.74 sq. mi.) <br />Area Subtracted 74 acres <br />Net Basin Area 3148 acres (4.92 sq. mi.) <br /> <br />A detailed investigation of the study area showed that the basin did not <br />have a common channel in which the entire basin would be tributary to Clear <br />Creek. In fact, the study could be broken down into several smaller areas, <br />all of which would be tributary to Clear Creek by different conveyance means. <br />For the purpose of analysis, the study was broken down into three planning <br />basins: Hidden Lake, Bates Lake and Clear Creek Planning Basin. <br />1. Hidden Lake Planning Basin <br />The largest planning basin in the study area is the Hidden Lake Planning <br />Basin which contains 3.08 sq. mi. (1971 acres) (see Figures 11-2 and III-I). <br />The jurisdictional area breakdown of the basin is also shown on Figure 11-2. <br />The major features of the Hidden Lake Planning Basin are Hidden Lake and the <br />several water supply and recreational ponds near the confluence of the basin <br />main floodway and Clear Creek. The upper area of the basin, west of Sheridan <br />Blvd. is within the City of Arvada, while the remaining area is in Adams County. <br />The primary water course for the planning basin follows 69th Avenue west <br />of Sheridan Blvd. by way of open channel and a storm sewer. The water course <br />flows into Hidden Lake east of Sheridan Blvd. A small ditch, Harry Holmes <br />Oitch, traverses east to Lowell Blvd. from the Hidden Lake spillway then <br />south along the west side of Lowell Blvd. The exact definition of the terminus <br />of the ditch is unclear since the ditch is infrequently used and serves primarily <br />as a drainage channel. The drainage swale continues south to the railroad <br />