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<br />B. Base Data <br />The base data utilized for the study included rainfall r'ecords in the <br />vicinity, the S.C.S. Soil Survey, as wel'l as verbal and newspaper' accounts of <br />sigrificant storm events. Rainfall records have been maintained for 54 years <br />by the Uncompahgre Water Users Association (U~IUA) at North 9th Avenue and <br />Park Street. Records at the Montrose Airport have been maintained for 27 years <br />by the National Weather Service (NWS). Thesl~ two records provide excellent <br />locid ra i nfa 11 base data. <br />The National Oceanic and Atmospheric Administration (NOAA) at1.~s provides <br />rainfall information for the State of Colorado. The isopluvial ra illfall <br />conl;ours are plotted for the 6 and 24 hour sto,oms of various frequencies. <br />PorU ons of the NOAA procedures and i sopl uvi a 'I s have been used for the study. <br />The USDA Soil Conservation Service (S.c.s.) "son Survey of thE~ Delta <br />Montrose AreCl" provides a detailed soils repol't for most of the study area. <br />Alsc considered were the soils data made available through the April, 1976 <br />"Geologic Hazards, Subsurface Soil-Groundwater Investigation (lnd General <br />Foundation Design Criteria Report" prepared for the Montrose County Corrrnissioners. <br />Hydrology and flooding reports addressin9 several nearby and/or hydrologi- <br />cally similar basins have been studied as part of this analysis. The studies <br />revi~wed included the Ridgeway Dam hydrology and several smaller basin studies <br />for '.hich stream flow records were aV/lilable. <br />The above data was further supplemented by 'Iocal field reconnaissance <br />by H:rdro-Triad, Ltd. staff. Since no stream flow records were available, field <br />obsel'vations have been made and verbal accounts of flood'ing recorded to aid in <br />corrcborating hydrologic findings. <br /> <br />. <br /> <br />2 <br />