Laserfiche WebLink
<br />e <br /> <br />discovering HTRW. The review may include stUdies'ofaerial photographs, interviews with long- <br />time residents, workers, and property owners. Local, state and federal regulatory or response <br />agencies may be consulted for license/permit actions or enforcement actions against property <br />owners. <br /> <br />...., All information and data gathered will be documented in the initial assessment. An <br />assessment of risk based on the probability of discovery and the severity of risk will be made. The <br />initial assessment will contain a recommendation for further investigations, if necessary. <br /> <br />The quality control (QC) processes described in the QC Plan will be performed for all work, <br />including an independent technical review of all products. <br /> <br />2.6 HYDRAULIC INVESTIGATIONS. The Government will perform this item in coordination <br />with the sponsor. <br /> <br />General. The major study objective is to reduce the flood hazard to Florence, Colorado. The work <br />shall consist of determining pre- and post-project flooded areas and preparing hydraulic designs for <br />the proposed alternatives. The work will include the following: <br /> <br />a. The Corps of Engineers will conduct site visit(s) to the project area to determine hydraulic <br />loss coefficients and to collect pertinent data on bridges and structures. <br /> <br />e <br /> <br />b. Without-project flood plains will be determined in accordance with Engineering Manual <br />1110-2-1416 River Hydraulics. Floodplains will be determined for the, 10%,2%, 1%, and 0.2% <br />chance floods. The results of the Sediment Impact Assessment will be incorporated. <br /> <br />c. Hydraulic design of the alternatives will be performed in accordance with Engineering <br />Manual 1110-2-1601 , Hydraulic Design of Flood Control Channels; Engineering Manual 111 0-2- <br />1418, Channel Stability Assessment for Flood Control Projects; and Engineering Manual 1110-2- <br />1416, River Hydraulics. Quality assurance will be determined in accordance with Engineering <br />Regulation 1110-1-12, Quality Assurance. Risk and uncertainty will be addressed in accordance <br />with Engineering Regulation 1I 05-2-10 1, Risk Based Analysis for Flood Damage Studies. Standard <br />deviations in support of risk and uncertainty evaluations will be determined in accordance with <br />Engineering Regulation 1105-2-101 Risk Based Analysis for Flood Damage Studies. <br /> <br />d. Hydraulic design will be performed on a dam on Oak creek and on channel modifications <br />along Oak creek. <br /> <br />(1) Hydraulic design using the standard step method in the HECRAS program and <br />normal depth equation in the FlowMaster program from Haestad. <br /> <br />(2) <br /> <br />Any energy dissipators will be designed using criteria obtained from "Hydraulic <br /> <br />e <br /> <br />SECTION B, PAGE 8 <br />