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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Dolores River near Dolores, Colorado <br />Flood Insurance Study <br /> <br />HYDROLOGY RF.PORT <br /> <br />I. Purpose <br /> <br />This onicc report discusses the hydrologic characteristics oflhe upper portions orthe Dolores <br /> <br />River, upstream of McPhee Dam and Reservoir in Montezuma County, Colorado. Its purpose is to <br /> <br />present historic naod data. Oow frequency curves, the IOO-year hydrograph for the study area, the <br /> <br />relationship between peak flow frequencies and McPhee Reservoir stages, and an analysis of <br /> <br />flooding and felated problems for the upper Dolores River basin (shown on Plate I). The data <br /> <br />presented will be used in the Dolores River near Dolores. Colorado. Flood Insurance Study <br /> <br />requested by the City of Dolores. Montezuma County, the Colorado State Water Conservation <br /> <br />Board. and the Federal Emergency Management Agency (FEMA) Region 8. The Flood Insurance <br /> <br />Study will be done in conformance with the current FEM^ Flood Insurance Study Guidelines and <br /> <br />Specifications for Study Contractors (Reference 4.b). <br /> <br />2. Scope <br /> <br />This hydrology report includes normal annual precipitation, flood flow frequency and durntion <br /> <br />analyses, storm.runofT relationships, historical flood analysis, and model development. The study <br /> <br />area begins at the upper end of McPhee Reservoir below the eity of Dolores, extends up the <br /> <br />Dolores River to the confluence of the two forks, the upper mainstem and the West Dolores <br /> <br />River. then up the two forks to the Montezuma County line. Data developed for the Corps' 1976 <br /> <br />Flood Hazard Intormation Study on the Dolores River above Dolores, Colorndo have been used <br /> <br />and augmented with current data. where available (Reference 4-e), <br />