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<br />TABLE 5 <br />sensitivity of 100-Year Peak Flows (c.f.s.) <br />to Various Losses at Mouth of Ralston Creek <br /> <br />Initial Loss <br />(inches) <br /> <br />Initial Loss <br />0.5 inches. <br />Difference from Control <br />Peak Flow <br />(c.f.s.) (percent) <br /> <br />Control Parameter: <br />Control value: <br /> <br />0.0 <br />0.5 <br />1.0 <br /> <br />o <br />o <br />1900 <br /> <br />o <br />o <br />-17 <br /> <br />Uniform Loss <br />( inches) <br /> <br />Uniform Loss <br />0.6 inches, <br />Difference from Control <br />Peak Flow <br />(c.f.s.) (percent) <br /> <br />Control Parameter: <br />Control value: <br /> <br />0.3 <br />0.6 <br />1.0 <br /> <br />2600 <br />o <br />2900 <br /> <br />+23 <br />o <br />-25 <br /> <br />Control Parameter: Overland Flow Resistance <br />Control value: 0.4. <br /> <br />Overland Flow <br />Resistance <br />(dimensionless) <br /> <br />Difference from Control <br />Peak Flow <br />(c.f.s.) (percent) <br /> <br />0.2 <br />0.4 <br />0.6 <br /> <br />1700 <br />o <br />1400 <br /> <br />+15 <br />o <br />-12 <br /> <br />3. Results <br />The Scope of Services for this study calls for a <br />hydrologic analysis for future ~ithout-project conditions <br />without Leyden Dam in place. These future conditions <br />represent development in the basin which would occur by the <br />year 2000 in accordance with reasonable projections of land <br />use by the City of Arvada Comprehensive Plan, June 1985. <br />Future conditions were also modeled with the existing Leyden <br />Dam in place. In both cases, values are based on existing <br />channel conditions and include the routing of floods through <br />Ralston Reservoir and Blunn Reservoir. <br />The flood hydrographs (for future conditions without <br />Leyden Dam) at strategic locations are presented in figures 9 <br />thru 15 for various frequencies of occurrence. Peak <br />discharges were plotted for the 10-, 50-, 100-, and 500-year <br /> <br />8 <br />