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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />, <br /> <br />I <br />I <br />I <br />I <br />, I <br />I <br /> <br />development of the 1/2 to 2-l/2-acre, semi-urban type. This area <br /> <br />has also developed slowly, with most being found along the line <br /> <br />of Templeton Gap Road (Black Forest Road) and vollmer Road, <br /> <br />The western half of the basin was <br /> <br />first developed in the mid-1960's as 1/2 acre to 2-1/2 acre resi- <br /> <br />dential tracts a short distance north of Cottonwood Creek,The <br /> <br />development was influenced by construction of the Air Force Academy <br /> <br />with the size of the tracts set by County Health rules for us~ of <br /> <br />on-site disposal of sewage. True urban type development tentatively <br /> <br />entered the basin in 1972 and, after a two-year delay, this develop- <br /> <br />ment has been quite rapid, <br /> <br />The urban development in the western <br /> <br />half of the basin has nearly filled, the area south of Cottonwood <br /> <br />Creek from Monument Creek to a point about a mile east of Union <br /> <br />Boulevard, Due to the presence of the 1/2 acre to 2-1/2 acre <br /> <br />tract development, development has leapfrogged this area and is <br /> <br />now commencing in the northern part of this portion of the basin, <br /> <br />This urban area development, under the control of the City of <br /> <br />Colorado Springs, has been developed with storm drainage facilities, <br />.... ~ <br /> <br />with a few exceptions, pre-urban developments have no coherent <br /> <br />drainage system, The drainage in these areas consists primarily <br /> <br />of roadside ditches and ~ulvert crossings, <br /> <br />The first purpose of this study was <br /> <br />to determine the probable runoff flow throughout the basin as <br /> <br />-~------~---'----. - --~--~--'----'---~---. <br /> <br />c~~ <br /> <br />determined by existing City rainfall/runoff criteria. The second <br />----'--------.-.---... - .~._--'~ .-........."""," .-' <----,--~~----~-~ <br /> <br />purpose of this study was to survey the existinq drainaqe structures <br /> <br />-2- <br />