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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 />Lakewood Gulch watershed has a drainage area of approximately 16.0 square miles, the <br />majority of which is in the City of Lakewood. The lower 2.3 miles of stream length are <br />in Denver. Decatur Street crosses the gulch about l400-feet upstream of the confluence <br />with the South Platte River. The basin is nearing full development. According to the <br />Lakewood Gulch Major Draingeway Planning Study prepared for the UD&FCD, the <br />future conditions peak flow rates in the lower reach of the gulch are: <br /> <br />Return Frequency <br />100-Year <br />10-Year <br />5- Year <br />2- Year <br /> <br />Future Conditions Peak <br />10,900 cfs <br />7,000 cfs <br />3,950 cfs <br />1,800 cfs <br /> <br />Based on information provided by Robert Jarrett of the USGS, (email correspondence <br />provided by Kevin Stewart, UD&FCD), a preliminary peak discharge estimate for the <br />5/14/07 event was approximately 550 cfs, or considerably less than the 2-year event. <br />Based on high water marks, Mr. Jarrett estimated that the depth of flow over the path <br />ranged from 1- to 2-feet with flow velocities likely up to l2-feet per second. According <br />to streamflow-gaging station results from the USGS gage at 10th and Lakewood Guleh <br />(upstream of Decatur Street), two rainfall events which occurred on April 24, 2007 and <br />May 1, 2007 produced peak flows which exceeded the 5/14/07 event. <br /> <br />ICON Engineering, Inc <br /> <br />2 <br />