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<br />II. STUDY OBJECTIVE <br /> <br />The objective of the study is to present a comprehensive repOlt of the current problem, <br />associated risks, proposed design alternatives, associated costs and benefits of the project. <br />This data has been compiled from engineering design, reports and studies prepared for <br />the project over the past 10 years by private consultants and the U.S. Army Corps of <br />Engineers (COE). The intent ofthis study is to evaluate the financial feasibility of the <br />alternatives and to compile this data following CWCB Guidelines to facilitate funding by <br />CWCB. The City of Ouray has realized the need for this project for over 10 years and <br />potential risk to public facilities and potential for personal injury increases each year the <br />project is not implemented due to lack of financing. <br /> <br />III SCOPE OF WORK <br /> <br />A. Background Information <br /> <br />Climatic Information: <br /> <br />The City of Ouray is situated at close to 8000-feet above MSL and has a mod(:rate <br />summer with cold snowy winters. Much of the precipitation in this location occurs as <br />snowfall. The Climatology Report (Number 77-1) from the Colorado Climatology Office <br />shows a mean annual precipitation for Ouray of21.1-inches, which indudes snowfall. <br />This report appears to be a summary of recorded data from 1951 to 1970. The highest <br />rainfall months are shown as July and August with monthly mean rainfall of2.32-inches <br />and 2.45-inches respectively. Localized cloudbursts of short duration with intense <br />rainfall are common during mid to late summer. The greatest daily rainfall is shown at <br />1.95-inches occurring on October 3rd, 1969. Average monthly temperatures vary from a <br />low of23.4 degrees F in January to 66.4 degrees F in July. <br /> <br />Debris Flows: <br /> <br />Debris flows occur periodically in the steep, rocky, confined drainages tributary to the <br />Uncompahgre River in response to summer time eloudbursts. Resultant damage caused <br />by flash flooding is often due to the sediment and debris carried by the floodwaters rather <br />than the water itself. The Floodplain Information Report for Ouray County (A & S <br />Consultants Inc., 1978) discusses many of these types of events and the subsequent <br />property damage. Skyrocket Creek is specifically mentioned in the July 1927 flood event <br />and the July 1929 event when total damages were estimated at $40,000 and $] 50,000 <br />respectively. The City also reported damage to the City hot pools due to debris <br />overtopping the diversion wall in Skyrocket Creek in 1951 and 1981. Several other <br />drainages (including Cascade Creek and Portland Creek) that nm through the City <br />experience similar debris flows and recent structural improvements have helped alleviate <br />the risk of property damage. <br /> <br />4 <br />