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<br />DEPARTMENT OF THE ARMY
<br />SACRAMENTO DISTRICT. CORPS OF ENGINEERS
<br />6S0 CAPITOL. MAL.L.
<br />SACRAMENTO. CAL.IFORNIA 9S814
<br />
<br />REPLY TO
<br />ATTENTION OF
<br />
<br />SPKED-T
<br />
<br />29 February 1980
<br />
<br />Mr. J. William McDonald, Direclor
<br />Colorado Water Conservation Board
<br />823 State Centennial Building
<br />1313 Sherman Street
<br />Denver, Colorado 80203
<br />
<br />Dear Mr. McDonald:
<br />
<br />A report describing the flood hazard along the Gunnison and Uncompahgre Rivers in the
<br />vicinity of Delta, Delta County, is inclosed. This report was prepared in response to your
<br />30 March 1977 letter and original requests from the Commissioners of Delta and Montrose
<br />Counties. Fifty copies of the report will be furnished to each county involved.
<br />
<br />The report includes discussion of the nature of flooding in the area studied, descriptive data on
<br />the 100-year flood in that area, maps (scale 1 inch = 400 feet) showing areas subject to 100-year
<br />flooding, profiles showing the elevations the 10-, 50-, 100-, and sOO-year floods are expected to
<br />reach, and a brief explanation of the methodology of deriving the magnitude of the 100-year
<br />flood. A table of f1oodflow values together with corresponding water surface elevations is
<br />shown as Appendix A. Reproducible maps (scale 1 inch = 200 feet) showing the limits of the 100-
<br />year flood will be furnished to you.
<br />
<br />Detailed information on the hydrologic study basic to the report is contained in an April 1979
<br />Office Memorandum entitled "Gunnison and Uncompahgre Rivers, Delta and Montrose
<br />Counties, Colorado, Flood Hazard Information Hydrology." That memorandum has been
<br />furnished to you, and copies are available for review in this office. Authority for preparing the
<br />inclosed report was provided by Section 206 of the 1960 Flood Control Act, as amended. On ihe
<br />request of interested public agencies, the Sacramento District will interpret data in the report
<br />and provide technical assistance in their application.
<br />
<br />The Sacramento District gratefully acknowledges the assistance and cooperation of the
<br />Commissioners of Delta and Montrose Counties; the Colorado Department of Highways; the
<br />Colorado Water Conservation Board; the National Weather Service; the u.s. Water and Power
<br />Resources Service; the U.s. Soil Conservation Service; various city, county, state, and Federal
<br />agencies; and others who directly or indirectly aided in the preparation of the report.
<br />
<br />1 Incl
<br />As sta ted
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<br />G:t~I!w1:,,~/.K
<br />
<br />Chief, Engineering Division
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