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L ',' ,-"'~-.;;:, "'" .J;t:-.;i/~Ii All Flood Insurance Study Contractors Pag", Thre3 B. A "Sununary of Discharges" Table is being included in published reports, instead of the former "Frequency-Discharge, Drainage Area Curve." The new format requires tabulation, at specific locations (e.g., bridges, corporate limits, etc.), of the 10-, 50-, 100-, and SOO-year storm peak discharges and their corre- sponding drainage areas. Study contractors are currently being asked by the TECs to supply this backup data. The TECs will make the required revisions. III. Maps A./corporate limits should be verified between the Vicinity Map and FIRM/FBFMs. B. ;/ Flood and floodway boundaries must be shown as clear and con- tinuous lines on the FIRM and FBFM. Study contractors are asked to show flood and floodway boundaries through bridges, indicating the extent of flooding below the bridge, even though flow over the bridge may not occur. This is per current FIA policy. C. "/Base flood elevation (BFE) lines should be located on the FIRM " to depict the elevations of the IOO-year flood, rounded to the nearest whole foot, at changes in the slope of the 100-year Flood Profiles, and at corporate limits, zone boundaries, and the upstream limits of study. Location of BFEs at breaks in the water-surface profile slope allows for the most accurate interpolation of elevations between BFEs on the FIRM. D. ~ource materials provided to the TECs for the preparation of base maps must be accompanied by source and date information. Of course, the deficiencies listed here are chiefly of an editorial or graphical nature. Numerous significant technical errors have been found in the hydro- logic and hydraulic analyses, and in the consideration of future hydraulic conditions in some studies reviewed since the TEC process was initiated in 1974. However, as expected, studies having such significant problems have been relatively few in number. The above comments, therefore, are offered as specific instances where the 1976 FIA Guidelines and Specifications have been either revised or frequently overlooked. We appreciate any reaction you may lave to these comments. If you have any questions on them, please contact ~.Jl.i.lle.r....Qi...E.IA..Ai;.,j2.Q2.L..4.12;;:~J_. J/.. /,,.,, ) ))-/ -"7 /, , )].111')