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<br />Flow data for Government and Hubbard Gulch Creeks are nonexistent. <br />Therefore, hydrologIc and meteorologic data for runoff were snythe- <br />sized from records of other stream basins having simIlar hydrologIc, <br />meteorologic, and physiographIc characterIstIcs. <br /> <br />PrecIpItation data used to develop runoff from the creeks were <br />obtained from recording precipitatIon stations shown In Table 3. <br />Their locations are shown on Plate 1. <br /> <br />TABLE 3 <br /> <br />p~rCIPITATION STATIONS <br /> <br />Station Stat i on Normal Annua I <br />Nu,"ber Name PrecipItation <br /> Inches <br />1 Rifle 10.9 <br />2 Grand Junct ion 8.3 <br /> <br />The maps prepared for this report were based on the U.S. Geologi- <br />cal Survey 7.5-minute quadrangle sheet entitled "Rifle, Colorado", 1952. <br />Cross sections and stream profi les were developed from this quadrangle <br />and supplemental topographic maps furnished by the Colorado Department <br />of Highways and the city of Rifle. Structural data on bridges were <br />obtained from the U.S. Sol I Conservation ServIce and by Corps of <br />Engineers personnel in the field during the course of the study. <br /> <br />FLOOD SEASON AND FLOOD CHARACTERISTICS <br /> <br />Major flooding In the study area from the Colorado River Is due <br /> <br /> <br />normally to late sprino snowmelt runoff, which Is characterized by <br /> <br /> <br />moderate peaks, long duration of flows, large volumes, and marked <br /> <br /> <br />diurnal fluctuations. Major flooding in the study area fro," Rifle, <br /> <br /> <br />Government, and Hubbard Gulch Creeks Is due prlmari Iy to cloudburst <br /> <br /> <br />runoff, which generally occurs during the summer. Runoff from cloud- <br /> <br /> <br />bursts Is characterized by high peak flows, short duration of flows, <br /> <br /> <br />and smal I volumes. <br /> <br />6 <br />