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<br />FEDERAL EMERGENCY MANAGEMENT AGENCY <br />RIVERINE HYDROLOGY & HYDRAULICS FORM <br /> <br />O.M.B No. 3067-0148 <br />Expires September 30, 2005 <br /> <br />PAPERWORK REDUCTION ACT <br /> <br />Public reporting burden for this form is estimated to average 3 hours per response. The burden estimate includes the time for reviewing instructions, <br />searching existing data sources, gathering and maintaining the needed data, and completing, reviewing, and submitting the form. You are not <br />required to respond to this collection of information unless a valid OMS control number appears in the upper right comer of this form. Send <br />comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: Information Collections Management, <br />Federal Emergency Management Agency, 500 C Street, SW, Washington DC 20472, Paperwofk Reduction Project (3067-0148). Submission of the <br />form is required to obtain or retain benefits under the National Flood Insurance Program. Please do not send your completed survey to the <br />above address. <br /> <br />Flooding Source: CACHE LA POUDRE RIVER <br />Note: Fill out one form for each flooding source studied <br /> <br />A. HYDROLOGY <br /> <br />1. Reason for New Hydrologic Analysis (check all that apply) <br /> <br />~ Not revised (skip to section 2) <br />o Alternative methodology <br /> <br />o No existing analysis <br />o Proposed Conditions (CLOMR) <br /> <br />o Improved data <br />o Changed physical condition of watershed <br /> <br />2. Comparison of Representative 1 'Yo-Annual-Chance Discharges <br /> <br />Location <br /> <br />Drainage Area (Sq. Mi.) <br /> <br />FIS (cfs) <br /> <br />Revised (cfs) <br /> <br />3. Methodology for New Hydrologic Analysis (check all that apply) <br /> <br />o Statistical Analysis of Gage Records <br />o Regional Regression Equations <br /> <br />o Precipitation/Runoff Model rrR-20, HEC-1, HEC-HMS etc.] <br />o Other (please attach description) <br /> <br />Please enclose all relevant models in digital format, maps, computations (including computation of parameters) and documentation to support <br />the new analysis. The document, "Numerical Models Accepted by FEMA for NFIP Usage" lists the models accepted by FEMA. This document <br />can be found at: http://www.fema.gov/mitltsd/en_modl.htm. <br /> <br />4. Review/Approval of Analysis <br /> <br />If your community requires a regional, state, or federal agency to review the hydrologic analysis, please attach evidence of approval/review. <br /> <br />5. Impacts of Sediment Transport on Hydrology <br /> <br />Was sediment transport considered? 0 Yes 0 No If yes, then fill out Section F (Sediment Transport) of Form 3. If No, then attach <br />your explanation for why sediment transport was not considered. <br /> <br />B. HYDRAULICS <br /> <br />1. Reach to be Revised <br /> <br />Description Cross Section <br /> <br />Water-Surface Elevations (ft.) <br />Effective Proposed/Revised <br />4837.1 4837.1 <br /> <br />Downstream Limit <br /> <br />800 ft upstream of County Road 5 AE : 22,368 <br /> <br />Upstream Limit <br /> <br />750 ft downstream of Interstate 25 AK : 28,383 <br /> <br />4846.8 <br /> <br />4846.8 <br /> <br />2. Hvdraulic Method Used <br /> <br />Hydraulic Analysis HEC,RAS [HEC,2 , HEC-RAS, Other (Attach description)] <br /> <br />FEMA Form 81,89A, SEP 02 <br /> <br />Riverine Hydrology & Hydraulics Form <br /> <br />MT,2 Form 2 Page 1 of 2 <br />