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<br />I;" <br />, <br /> <br />.>, <br /> <br />1 <br />I <br />I <br />I <br /> <br />1 <br />! <'J <br />~ <br />~ <br />~~ <br />~ ~ <br />~ <br />,~ ~ <br />'~~ <br />I::~ <br />~~ <br /> <br />. <br /> <br />. <br /> <br /> <br />Previous Study <br /> <br />The Albuquerque District of the Corps of Engineers conducted a <br /> <br /> <br />floodplain information study for the Pike's Peak Area Council of Govern- ~ aiel <br /> <br /> <br />ments and published a report entitled, "Flood Plain Information - jve.SlBtl <br /> <br /> <br />Fountain Creek, Colorado Springs-Manitou Springs, Colorado", in 1974. -IJ-4!Z(.~1':> <br /> <br /> <br />Detailed hydrologic information is contained in a separate report, Z <br /> <br /> <br />"Hydrologic Data for Flood Plain Information Study - Fountain Creek". <br /> <br />The streamflow records for Fountain Creek at the Pueblo gage were <br /> <br /> <br />used for flood frequency determination, although there were three others <br /> <br /> <br />available. The records for the gages near Colorado Springs and at <br /> <br /> <br />Security were too short, while the Fountain gage data did not represent <br /> <br /> <br />the flood potential of the stream. The frequency curve at Pueblo as <br /> <br /> <br />shown in Figure 2 was determined by log-Pearson Type III distribution <br /> <br /> <br />fit of the records from 19,41 to 1965 and 1935. <br /> <br />The standard project floods (SPF) at Manitou Springs, Colorado <br /> <br /> <br />Springs, El Paso-Pueblo County line and Pueblo were developed through use <br /> <br /> <br />of the June 1921 storm. Drainage areas above 9,000 feet in elevation <br /> <br /> <br />were not included in the SPF computations because they would make in- <br /> <br /> <br />significant contribution from storms of standard project. The plot of <br /> <br /> <br />unit discharge versus drainage area is shown in Figure 3. This curve <br /> <br /> <br />was used to compute SPF discharges for Fountain Creek at locations <br /> <br />between ~~nitou Springs and Colorado Springs. <br /> <br />Z.19,000 ,.2:3'" res <br />':)21<. <br />approximately <br /> <br /> <br />The SPF discharge of 219,000 <br /> <br /> <br />equivalent to the magnitude of t e <br /> <br /> <br />Based on this, frequency curves <br /> <br />ueblo gage is <br /> <br />r flood as seen from Figure 2. <br />locations were developed by <br /> <br />assigning a recurrence interval of 350 years to each standard project <br /> <br /> <br />flood and constructing curves parallel to the frequency curve at Pueblo <br /> <br /> <br />gage (Figures 5, 6 and 7). <br /> <br />For Sutherland creek,~Leigh Whitehead and Associates, Consulting <br /> <br /> <br />Engineers, completed a floodplain study in 1975. Three different peak <br /> <br /> <br />discharges for the 100-year flood were presented in their report. The <br /> <br />NOf' 0\\ <br />O~~/r"Nl/1e . <br /> <br />I - <br /> <br />--- <br />