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<br />3 <br /> <br />" <br /> <br />-. <br /> <br />4 <br /> <br />3.0 <br /> <br />ENGINEERING METHODS <br /> <br />For flooding sources studied in detail in the county, standard hydrologic <br />and hydraulic study methods were used to determine the flood hazard data <br />required for this study. Flocds having recurrence intervals of 10, 50, <br />100, and 500 years have been selected as having special significance for <br />flood plain management and for flood insurance premium rates. The <br />analyses reported here reflect current conditions in the watersheds of <br />the streams. <br /> <br />3.1 Hydrologic Analyses <br /> <br />Hydrologic analyses were carried out to establish the peak discharge- <br />frequency relationships for floods of the selected recurrence <br />intervals for each stream segment studied in detail in the county. <br /> <br />Annual maximum peak flows for the 10-, 50-, 100-, and 500-year <br />floods on these streams studied by detailed methods were based on <br />records from the u.s. Geological Survey stream gaging stations given <br />in the following summary, and on the results of a regional peak- <br />flow, frequency analysis. <br /> <br />STREAM G~GING STATIONS <br /> <br />Station Name <br /> <br />Baldy Creek near New Castle <br />Battlement Creek near Grand Valley <br />Beaver Creek near Rifle <br />Canyon Creek above New Ca!,tle <br />Canyon Creek near New Castle <br />Colorado River at Glenwood Springs <br />Colorado River at New Cas1:1e <br />Colorado River below G1en~rood Springs <br />East Canyon Creek near Ne~l Castle <br />East Divide Creek near Silt <br />East Rifle Creek near Rifle <br />Elk Creek .at New Castle <br />Fourmile Creek near Carbondale <br />Parachute Creek at Grand Valley <br />Parachute Creek near Grand Valley <br />Possum Creek near New Cast:le <br />Roan Creek above Clear Creek <br />near DeBeque <br />Roan Creek near DeBeque <br />Roaring Fork River at Glenwood Springs <br />Rifle Creek near Rifle <br />West Fork Parachute Creek near <br />Grand Valley <br /> <br />8 <br /> <br />Period of Record <br /> <br />1956-61 <br />1957-65 <br />1952':"present <br />1969-present <br />1955-60 <br />1900-present <br />1966-72 <br />1966-present <br />1969-present <br />1959-65 <br />1936-43, 1956-64 <br />1922-23, 1955-60 <br />1942-47 <br />1921-27, 1948-54 <br />1948-54, 1964-70 <br />1969-present <br /> <br />1962-68 <br />1921-26, 1962-72 <br />1906-09, 19l2, 1914-present <br />1939-46, 1952-64 <br /> <br />1957-62 <br />