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<br />Gaging Station Name <br /> <br />Period of Record <br />(years) <br /> <br />Miller Creek near Meeker, Colorado <br />North Fork White River at Buford, Colorado <br />Piceance Creek at Whit:e River <br />Piceance Creek below F~an Gulch <br />South Fork White River at Buford, Colorado <br />South Fork White River near Buford, Colorado <br />White River above Coal Creek near Meeker, Colorado <br />'White River above'Rangely, Colorado <br />White River below Meeker, Colorado <br />White River near Meeker, Colorado <br />White River near Watson, Utah <br /> <br />6 <br />29 <br />6 <br />10 <br />24 <br />20 <br />14 <br />2 <br />13 <br />70 <br />51 <br /> <br />. I <br /> <br />.. <br /> <br />Flow data for the Watson, Utah gage are considered applicable to <br />Rangely because approximately 90 percent of the snowmelt flow at <br />that gage originates ~~stream from Rangely. Data for general peak <br />flows of floods caused by rainfall at the Watson gage are also <br />considered acceptable for analysis of flow at Rangely because the <br />difference in runoff peaks would not be significant. <br /> <br />Stage frequency curves for ice jam and natural streamflow events <br />were calculated for bro points on the White River. These points are <br />at the water treatment: plant and at the location of Colorow Avenue <br />extended. The curves were combined to provide an all-event curve <br />for each location. Data from the Watson gage were used to construct <br />the natural stream curve. The ice jam curve was constructed on the <br />basis of newspaper accounts and the recollections of local residents. <br />Analysis of the stage frequency curves showed insignificant differences <br />between the lOa-year ice jam curve and the natural streamflow curve <br />on the White River at Rangely. <br /> <br />Standard project thunderstorms developed for the study area were <br />estimated to be 35 percent of the 3-hour probable maximum precipita- <br />tion calculated on the basis of National Oceanic and Atmospheric <br />Administration (NOAA) procedures and curves in a report giving <br />thunderstorm precipitation estimates (Reference 1). Precipitation <br />values for 10-, 50-, and lOa-year thunderstorms were extracted from <br />the NOAA Precipitation-Frequency Atlas (Reference 2). The 1-, 3-, <br />6-, and 24-.hour values for May through October were plotted on <br />frequency paper together with historical values from the Rangely <br />precipitation station (period of record 35 years). The NOAA curves <br />appeared reasonable and were, therefore, extended to the 500-year <br />frequency to derive the 500-year flood. <br /> <br />Unit hydrographs for 1~e areas studied by detailed methods were <br />developed using the slnnmation hydrograph (s-curve) procedure (Refer- <br />ence 3). <br /> <br />8 <br /> <br />~ <br />