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<br />i\.1ajor rainlloods generally occur in the later summer or fall seasons and are caused by <br /> <br />gencral rainstorms. Local thunderstorms can also occur, but these rains generally produce <br /> <br />localized llooding in the larger basins and major lloods only in the smaller basins along desert <br /> <br />foothills. The highest flows on Lost Canyon Creek are caused by cloudbursHype storms. A <br /> <br />general rainstorm during the snowmelt season (April-June) could produce a peak How higher than <br /> <br />that from snowmelt alone, if higher air temperatures accompanied the rainstorm. Table 5 shows <br /> <br />all of the observed peaks above 5,000 cfs at the Dolores River at Dolores gage. the range ofllo\\! <br /> <br />that causes llooding in and upstream of the city of Dolores. (See Section 8.2 for a discussion of <br /> <br />annual peak How records and frequency curves for Dolores River at Dolores, Dolores River <br /> <br />below Rico, and Lost Canyon Creek near Dolores, Colorado strcaml10w gages.) <br /> <br /> Table 5 <br />Obscnt'd Pellks ahon 5.000 cfs <br />Dolores Rin~r at Dolores Gage <br />Date Flow (cls) Type <br />5-0cl-ll 10,000 E Rain <br />19-Jun-49 8.140 Rain on snow <br />ll-May-41 8,070 Snowmelt <br />4-May-22 7,340 Snowmelt <br />28-Jun-27 7,030 Rain on snow <br />6-Jun-57 6.690 Snowmelt <br />25-May-84 6,450 Snowmelt <br />18-May-83 6,070 Snowmelt <br />20-May-73 5,750 Snowmelt <br />16-May-44 5,670 Snowmelt <br />19-5ep-25 5,600 Rain <br />28-~lay-93 5.500 Snowmell <br />4-May-52 5,440 Snowmelt <br />17-Jun-95 5.340 Snowmelt <br />25-May-26 5.220 Snowmelt <br />6-Sep-70 5.190 Rain <br />25-Apr-38 5.090 Snowmelt <br />20-May-48 5.040 Snowmelt <br /> <br />Source: WY 1912, 1925-77 (See Reference4-i) <br />,^'Y 1978-2003 (USGS) <br /> <br />13 <br />