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<br />'l <br />;) <br /> <br />1901 SOUTH NAVAJO STREET. DENVER, COLORADO 80223, U. S.-A. <br />TELEPHONE: 303/936-3417 . TELEX: 45-551 . CABLE: ECIDEN <br /> <br />2-0b?:- <br /> <br />, <br />'"1 <br /> <br /> <br />CONSULTANTS, INC. <br /> <br />)~_ i <br /> <br />Mr. Larry F. Lang, Chief <br />Flood Control and Conservation Section <br />Colorado Water c~ervation Board <br />823 State Qentenn al Building <br />1313 Sherman Stree, <br />Denver, Colorado 80203 <br /> <br />Dear Mr. Lang: <br /> <br />January 31, 1977 <br /> <br />Our File: 1172/1 <br />DG 115/77 <br /> <br />Attached please find the Technical Addendum for the hydraulic <br />analysis of Gunnison River/Tomichi Creek Floodplain Information Study. <br /> <br />The material enclosed in the Addendum includes: sample.of input <br />and output from HEC-2 computer runs for reaches from Gunnison River and <br />Tomichi Creek, manning roughness coefficient (n) values used in the <br />study, those cross sections that were field surveyed to establish. chan- <br />nel bottom, examples of digitized cross sections adjusted utilizing the <br />field survey data, and field notes on highway bridge spanning Gunnison <br />River and Tomichi Creek. <br /> <br />Previous to this time we have submitted to Colorado Water Conserva- <br />tion Board the Technical Addendum for the hydrologic analysis portion of <br />this study. <br /> <br />If 'you have any questions related to this matter, please let me <br />know. <br /> <br />Enclosures <br /> <br />ASA! cr <br /> <br />Very truly yours, <br /> <br />ENGINEERING CONSULTANTS, INC. <br /> <br />~.S.~MS <br /> <br />A.S. Andrews, P.E. <br />Project Manager <br /> <br />A PLANNING RESEARCH CORPORATION COMPANY <br />