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7.0 DOLORES RIVER BASIN DRAFT DRAFT DRAFT Hydrology data from detailed floodplain analyses were obtained and analyzed for the Dolores River basin. The Dolores River basin was not divided into subregions, A description of the Dolores River region along with the associated regression equation and application criteria are presented below. Figure 1,0, which graphically presents the regional and subregional boundaries for the state, is located in the map pocket at the end of this report. DLR-l: DOLORES RIVER SUBREGION This subregion includes the Dolores River mainstem and its tributaries in southwestern Colorado. Streams in this subregion are located in portions of Dolores County, San Miguel County, Montrose County, and Mesa County, Major tributaries in this subregion include the San Miguel River, Naturita Creek, and West Dolores River. The subregion is bounded as follows: . On the north by the Dolores River - Colorado River basin divide; . On the east by the Dolores River - Gunnison River basin divide; . On the south by the Dolores River - San Juan River basin divide; and . On the west by the Colorado - Utah state line, The regression equation for this subregion is only valid for natural tributary streams that have drainage areas between 2 mi2 and 1,080 mil. A detailed study or other hydrologic analysis must be performed for projects involving streams with drainage areas that fall outside of the applicable range. The equation for subregion DLR-l is: Q = 213.8(A)"601 Where: A = Drainage Area, square miles (2<A<I,080) Q = 100 year peak flow, cfs Sub- Sub- #of R Squared Std region region Regression Data Min. Max. (Regression Error of Name Description Equation Points D.A. D.A. Correlation) Estimate DLR-l D%res Q - 213,8(A)f<l\ 21 2 1080 ,926 24% River Basin 28