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<br />, <br />I <br />, <br />I <br /> <br />SECTION II <br /> <br />STUDY AREA <br /> <br />The following description of the study area is presented to <br />familiari~e the reader with conditions existing within the <br />drainage basins. <br /> <br />HISTORY OF BASINS <br />The first reliable information regarding development of the Weir <br />and Sanderson Drainage Basins is represented on a 1937 Ft. Logan <br />D.S.G.S. Quadrangle. In 1937 the Denver city limits extended <br />west to Sheridan Blvd. and south to Alameda Avenue in the Weir <br />Gulch Basin. Development had taken place in essentially all <br />areas within the city limits. Upstream of Alameda Avenue, very <br />little development is evident on the 1937 quadrangle. A few <br />scattered houses were indicated in the area of Ohio to Harlan <br />in what is now Lakewood. <br /> <br />The Sanderson Gulch Basin had experienced virtually no develop- <br />ment in 1937. The Denver city limits extended west only as <br />far as Mariposa street. From Mariposa to Sheridan was Arapahoe <br />County and from Sheridan west, Jefferson County. <br /> <br />Figure 1, Drainageways and Basin Boundaries as shown on the <br />1937 U.S.G.S Quadrangle, illustrates the natural drainage courses <br />and basin boundaries existing prior to development of the area. <br />comparing this map to present development in the area reveals <br />that most of the main gulches have remained in their historic <br />locations. Several minor drainageways through basins, however, <br />have been obliterated by development in recent years. In each <br />of these cases, major local drainage problems exist which will <br />not bp ~olv~d hy th~ improvements of the mai~ gulch. <br /> <br />Figure 1 indicates that the historic channel of Weir Gulch below <br />main reservoir was located approximately one-quarter mile north <br />of the present man-made Channel route. The extreme difficulties <br />associated with designing drainage facilities in this area repre- <br />sents the effect of relocating a channel from its natural course. <br /> <br />Comparison of the 1937 quadrangle to the 1965 quadrangle indicutes <br />that numerous old irrigation storage reservoirs have bcen <br />Ob""O-~"~'" ..... ~~-~_.. d^v"o^^"n" '-0-.'" L~~,~ ___,_~ y.".,L -~, <br />__~ ._.~_ ~) 'yy~"'" ~~.. ......~~. "'''''" ""'''' '" ""'.~ .,~. H ....,.... <br />south Hallock Reservoirs in the area pre Bently occupied by <br />Villa Italia Shopping Center; East Hallock Reservoir, now the <br />site of Martindale Subdivision; Joint Reservoir which was located <br />at tho junction of Mississippi and Pierce; Clover Knoll Reservoir <br />located just southwost of the Joint Reservoir1 ~nd Crosley and <br />Westfield Reservoirs located southwest of the intersection of <br /> <br />-8- <br />