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<br />.. <br /> <br />, <br /> <br /> <br />,...,.... ' <br /> <br />Post Office Box 471 . Boulder, Colorodo B0306 <br /> <br />Publ ic Works Department <br /> <br />2045, 13tf1 51,' Boulder, Colorado 80302. (303) 441-3900 <br /> <br />July 10, 1985 <br /> <br /> <br />Mr. Mike Schmid, P.E. <br />Engineering Professionals, Inc. <br />2625 Redwing Road, Suite 110 <br />Fort Collins, Colorado 80524 <br /> <br />ST. VRAIN CREEK HYDROLOGY <br /> <br />Enclosed is a write-up of the St. Vrain Creek hydrology. <br />write-up was taken from three sources: <br /> <br />The content of this <br /> <br />1. Corps of Engineers St. Vrain creek basin study of December 19081, (10), <br />2. The Floodplain Information Report entitled St. Vrain Creek Upstream of <br />Lyons, Boulder County Colorado, published in October, 1978 by Camp, Dresser <br />and McKee, Inc., (9), <br />3. Floodplain Information, Flood Control and Floodplain Management Plan for <br />St. Vrain Creek at Longmont, Colorado published in April, 1981 by water <br />Resource Consultants. <br /> <br />The information from the above sources was compared and no conflicts or <br />discrepancies were found. This information was then combined to produce a <br />definitive hydrological document to be used in the North St. Vrain - St. Vrain <br />Creek: Lyons to Longmont, Colorado study. <br /> <br />One area of concern in the St. Vrain Creek hydrology has been the discharges on <br />the North St. Vrain Creek immediately above the confluence with the South St. <br />Vrain Creek. These discharges were determined in consultation with Larry Lang, <br />Chief of the Flood Control Division of the Colorado Water Conservation Board. <br />The method used in determining these discharges consisted of multiplying the <br />figures obtained by the drainage basin area below Buttonrock Reservoir, and <br />adding the spillway discharge from Buttonrock Dam. The values obtained <br />correlated well with discharges on the South St. Vrain as well as downstream <br />discharges. These calculations were necessary as no information was available on <br />discharges at this particular point. The flows obtained are tabulated below: <br /> <br />Josephine W. Heath <br />County ComrrlSSlor.er <br /> <br />Ronald K. Stewart <br />County CommiSSioner <br /> <br />Herbert E. "Buz" Smith, Jr. <br />County Commissioner <br />