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<br />39 <br /> <br />The use of present tributary basin conditions to estimate future <br /> <br />flood hazards is clearly inadequate. The use of fully developed con- <br /> <br />ditions is conservative. If development is pt'oceeding slowly, this <br /> <br />approach may be unduly conservative. <br /> <br />For the purposes of UDFC planning, especially in rapidly developing <br />areas, the use of fully developed tributary basin hydrology is reasonable, <br /> <br />especially if the conservative nature of the approach is considered. <br /> <br />In special cases, a year-by-year analysis can be used, or alter- <br /> <br />native growth rates can be considered. These baseline conditions should <br /> <br />be fully understood by all groups prior to acceptance of the analysis. <br /> <br />For the case of Little Dry Creek, the hydrologic/hydraulic analysis <br /> <br />is not presented. It is available in the basic engineering report, <br /> <br />however (5) <br /> <br />~~ 4 - Determin_e~L~o_d_ Dam~tegor_i.e~ Lanj_Us.e <br />Determine the types of damages which might occur in the drainage <br /> <br />basin according to the land use. <br /> <br />Land Use <br /> <br />Potential Damage Description <br /> <br />A. Public streets, bridges, <br />culverts and utilities <br /> <br />1. Wash-outs damaging structures <br />and necessitating repair or <br />replacement, including structure <br />damage or failure due to debris <br />pi 1 e up. <br />2. Interrupted traffic or services <br />3. Removal of debris and cleaning <br /> <br />B. Public unimproved open space <br /> <br />1. Erosion <br />2. Removal of debris and cleaning <br /> <br />C. Publ ic improved open space <br /> <br />1. Damage to facilities <br />2. Erosion <br />3. Removal of debris and cleaning <br /> <br />D. Private unimproved open <br />space (grazing) <br /> <br />1. Erosion <br />2. Loss of 1 ivestock <br />