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<br />. <br /> <br />. <br /> <br />. <br /> <br />ATTACHMENT 1 <br /> <br />Big Dry Creek Flood Hydrology <br /> <br />"Existing Conditions" vs. "Future Conditions" <br /> <br />Location "Existing Conditions" "Future Conditions" <br /> , , Flows Flows <br />1-25 8800cfs 11,200 cfs <br />120"' Ave, 8100 cfs 8100 cfs <br />Upstream of confluence with 6900 cfs 6900 cfs <br />Airport Creek <br />Downstream of Boulder Turnpike 5700 cfs 6100 cfs <br />Upstream of confluence with 3000 cfs 3700 cfs <br />Walnut Creek <br />Standley Lake outflow 700 cfs 1500 cfs <br /> <br />Note: When "future conditions" flows are equal to "existing conditions" flows, the <br />reason is that inadvertent detention by road and/or railroad embankments cancels out any <br />increases to the flows due to future urbanization, for the stream reach immediatelv <br />upstream of that road or railroad. <br />