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<br />. <br /> <br />. <br /> <br />recurrence intervals were computed for use in the Westmin- <br />ster Flood Insurance Study. <br /> <br />. <br /> <br />The final hydrology report supercedes the "Preliminary Hy- <br />drologic Report for 100-year Existing and Developed <br />Conditions, Big Dry Creek and Tributaries, Westminster and <br />Broomfield, Colorado" (Reference 10). The follo~ling major <br />changes were made to the preliminary report. <br /> <br />. <br /> <br />1. <br /> <br />For Big Dry Creek Drainage Basin the rainfall <br />distribution is based on: <br /> <br />. <br /> <br />A. <br /> <br />2-hour design storm with no areal adjustment from <br />Standley Dam to Colorado and Southern Railroad. <br /> <br />. <br /> <br />B. <br /> <br />3-hour design storm with a 10-20 square mile areal <br />adjustment to the Denver-Boulder Turnpike. <br /> <br />. <br /> <br />C. <br /> <br />6-hour design storm with a 20-30 square mile areal <br />adjustment to 120th Avenue. <br /> <br />. <br /> <br />D. <br /> <br />6-hour design storm with a 30-50 square mile areal <br />adjustment to Interstate 25. <br /> <br />. <br /> <br />2. <br /> <br />Additional typical cross-sections from the 1973 UD&FCD <br />Big Dry Creek Report (Reference 6) were utilized for <br />channel routings where possible to insure a more <br />representative model. <br /> <br />. <br /> <br />. <br />