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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 />I <br />I <br />I <br />I <br />I <br />I <br /> <br />lV", ,.. ., " ~, <br />'.... .. 1_ 'J . <br /> <br />Flood Plain Management <br /> <br />Integrating Barr Lake and the Henrylyn reservoirs into flood plain management can also <br />provide for substantial savings of the governmental expenditures presently projected to be <br />required for the increased surface flows from the impervious areas at the new airport. Urban <br />Drainage and Flood Control studies project required expenditures in excess of $225 million to <br />accommodate these developed flows. <br /> <br />Barr Lake is downstream from Third Creek and other drainages which receive flows from the <br /> <br />western half of the new airport. Reservoirs in the Henrylyn system are downstream from Box <br /> <br />Elder Creek which drains the eastern half of the airport. <br /> <br />Surface flows to both FRICD and Henrylyn are projected to substantially increase due to the <br />creation of impervious areas on the airport. These flows can be retained in the Companies' <br />system to the following effect: <br /> <br />I. The surface flows are tributary waters which belong to the South Platte River. <br />At times, the Companies will be in priority, and at other times they will not be in <br />priority. <br /> <br />When in priority, the Companies' reservoirs can retain the water, thus reducing <br />the magnitude and cost of downstream channel improvements. When out of <br />priority, the reservoirs can retain the water on an out of priority basis, and the <br />depletion to the stream can be made up by allowing Metro returns to remain in <br />the South Platte River for depletions to senior appropriators. Transportation <br />costs and losses would be eliminated under this concept. <br /> <br />24 <br />