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I I I I I I I 1 I I' I I I I I I I I I TABLE 2 ......................................... .-...................................... ........................................ ......................................... ......................................... ......................................... "'~n';o.":f'iV'iitb. :>i.;:i::~V~.:::.:b~..~)( .................................. ...... ......................................... ......................................... .....DrjiJN.... T.'........'."..,',.,.,'......,.,.,'"., >~:c:v : .: :;:.:<<=>>>:;:;:;::;:;:::::::::::-:> ...................... . .................-....-................ ...................... .. ........ .................................... .................................. .................................... ........................................ ,......n....n;t:ti;j':A/n;. 'if ",', >>: ;:.~u~:nu~<>: ..........................,...,..... ........,.....................",.,. .............................." .. ,ARBA(.t).A\) ) "':::::::::::::::::::::::::::::::::'.,:::::::::::::::':.:....;.;.;, Cl C2 C3 C4 C5 C6 C7 C8 C9 CI0 Cll C12 C13 6730 mF a ABOVE RIFLE CR BELOW RIFLE CR ABOVE PARACHUTE CR BELOW PARACHUTE CR DEBEQUE GAGE BELOW ROAN CR CAMEO GAGE BELOW PLATEAU CR PALISADE GAGE BELOW GUNNISON RIVER FRUlTA, FEMA DIS STUDY LIMIT ABOVE SALT WASH STATELINE GAGE (1.5 MI U/S) 6930 mi2 a 7130 mi2 b 7330 mF b 7370 mF c 7895 mi2 b 8050 mi2 c 8700 mi2 a 8753 mF c 16853 mi2 b 17100 mF a 17429 mF b 17843 mi2 c a Detennined from published US Army Corps of Engineers and FEMA information b Detennined from planimetering and published tributary infonnation C USGS gage infonnation Figure 4 shows the study reach and each of the hydrologic analysis points listed in Table 2. 2.5 Flood Characteristics -' Major flooding in the Colorado River basin has been primarily the result of rapid snowmelt which typically begins in late April. Snowmelt flooding can continue into early July. Flooding can also occur from rainfall on snowmelt in late winter or early spring. Due to the small areal extent and limited duration of thunderstorms, they do not typically constitute a major flood threat on streams as large as the Colorado River. They do, however, pose a problem for some of the smaller tributaries in the Colorado River basin. Snowmelt flooding is characterized by moderate peak flows, large volume of runoff, long duration, and diurnal fluctuation of flow~ Flooding from general rainfall alone, though 7