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<br />Explain how they were determined. <br /> <br />3. STARTING WATER,SURFACE ELEVATIONS <br /> <br />Explanation Attached? <br /> <br />ISI Yes <br /> <br />o No <br /> <br />OTE: If the effective study is an approximate study, the slope/area method is recommended. <br />For detailed anal sis studies, usin a known water-surface elevation is recommended. <br /> <br />4. RESULTS (from the model used to revise the 100-year water surface elevations) <br /> <br />If the resutts indicate any of the fOllowing. attach an explanation - to this form, or to the hydrautic model printout- as to the <br />reasonableness of the situation. <br /> <br />o Supercriticat depth <br />o <br />o <br />o <br />o <br /> <br />o Criticat Depth <br /> <br />o Drawdowns <br /> <br />o Negative Roodway Surcharges <br /> <br />Ftoodway Surcharges Greater Than Maximum Allowed by Community/State <br /> <br />Water surface elevations higher than the end points of cross sections. <br /> <br />Floodway discharge is dillerent than the Natural 100'year (base) flood discharge, <br /> <br />Project causes 1 DO-year floodplain or floodway elevations to increase (state if increases are located off the <br />requester's property) <br /> <br />Explanation attached with Form 0 <br /> <br />Explanation provided on attached printout [gI <br /> <br />If Hydraulic model used is HEC,2, has it been checked with FEMA'S CHECK-2 computer program? 0 Yes <br />(see instructions for information on how to obtain CHECK-2) <br /> <br />5. REVISED FIRM/FBFM AND FLOOD PROFILES <br /> <br />o No <br /> <br />1. Profile Transition <br /> <br />a. 1 DO-Year Water-Surface Elevations - indicate the difference in water surface elevations where the project 100-year <br />elevations tie into the existing lOa-year water surface elevations at each end of the project. <br /> <br />Downstream End N/A within N/A (feet) <br />Cross.Section # <br /> <br />Upstream End N/A within N/A (feet) <br />Cross-Section # <br /> <br />b. Floodway Elevations. indicate the difference in water surface elevations where the project flood way elevations tie into <br />the existing flood way water surface elevations at each end of the project. <br /> <br />Downstream End N/A within N/A (feet) <br />Cross-Section # <br /> <br />Upstream End N/A within N/A (feet) <br />Cross-Section # <br /> <br />c. Floodway widths - indicate the difference in floadway widths where the project floodway widths tie into the existing <br />flood way width at each end of the project. <br /> <br />Downstream End N/A within N/A (feet) <br />Cross-Section # <br /> <br />Upstream End N/A within NIA (feet) <br />Cross-Section # <br /> <br />2. Profile Checklist (check box if information has been provided on profile) <br /> <br />The following information (unless in parentheses) must be included at the same scale as the existing profiles for this project: <br /> <br />ISI Stream Name ISI Community Name 0 Corporate Limits labeled <br />ISI Confluences labeled ISI Channel Stationing ISI Streambed profiled <br />ISI Horizontal/Vertical Scales indicated ISI 1 aD-year elevs profiled * <br />ISI Road Crossings o Labeled ISI Low Chord Elevations <br /> <br />ISI Study limits labeled <br />ISI Cross Sections labeled <br /> <br />ISI Top of Road Elevations <br /> <br />*AII recurrence intervals in the effective study must also be profiled. <br /> <br />Ftoodway Data Tabte <br /> <br />Attach a Floodway Data Table for each cross section listed in the published Floodway Data table in the F1S report. <br /> <br />Floodway Data Table Attached <br /> <br />ISI Yes <br /> <br />o Not Required <br /> <br />FEMA Form 81-89C <br /> <br />Riverine Hydraulic Analysis Form <br /> <br />MT-2 Form 4 Page 2 of 2 <br />