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<br />003175 <br /> <br />Joint Coordination Agreement <br />January 1972, Revised November 1978 <br />Page 5 <br /> <br />a flood hazard study is initiated. The plan of study is to be a brief <br /> <br />document (generally 5 to 10 pages and a map) prepared in cooperation <br /> <br />with the CWCR, the requesting local entities, and SCS, stating the <br /> <br />responsibilities of the participants and the specifics of that <br /> <br />particular study. The plan of study demonstrates the need for funding <br /> <br />and provides for monitoring the study. A plan of study should be <br /> <br />prepared and submitted sufficiently in advance of the scheduled <br /> <br />initiation to keep staffing needs for surveys, investigations, and <br /> <br />report preparation in balance. <br /> <br />General Procedures <br /> <br />The following major activities will be undertaken in flood hazard <br /> <br />analyses and related floodplain studies: <br /> <br />a. Collection of basic data such as maps, photos, flooding history, <br /> <br />existing surveys, and file data. <br /> <br />b. The magnitude, frequency, and location of flooding will be <br /> <br />developed from hydrologic and hydraulic analyses. Since the <br /> <br />amou~t of information and details included in the analyses will <br />vary in accordance with specific objectives, appropriate ana1y- <br /> <br />tical procedures will be determined for each flood hazard study. <br /> <br />In general, the analyses will include the collection of cross <br /> <br />section data representative of the flood plain and channel areas. <br /> <br />These data are to be used in developing water surface profiles and <br /> <br />elevation-discharge curves. Rating curves and peak discharges <br /> <br />will be developed for selected frequencies of flooding. Several <br />