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Last modified
11/23/2009 10:40:51 AM
Creation date
10/4/2006 10:26:20 PM
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Floodplain Documents
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Statewide
Title
River Hydraulics
Date
10/15/1993
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />e <br /> <br />" <br /> <br />, <br /> <br />., <br /> <br />e <br /> <br />J <br /> <br />lc <br /> <br />e <br /> <br />Chapter 3 <br />Formulating Hydraulic Studies <br /> <br />3-1. Innlal Considerations <br /> <br />When assigned a hydrologic engineering study, the <br />tendency of many hydraulic engineers is to immediately <br />begin the technical analysis. However, the entire study <br />components must be planned first, recognizing the hydro- <br />logiclhydraulic information needs of other study team <br />members. For most hydrology and hydraulics (H&H) <br />studies, the engineer's initial effort should be spent on <br />scoping and evaluating as many aspects of the entire <br />study as can be identified. Besides individual experi- <br />ence, the hydraulic engineer sbouldutilize the experience <br />of others for advice and guidance in the technical aspects <br />of the study. Frequent communicalions with the study <br />manager, the economist, and other team members are <br />necessary to ensure that their requirements are met. <br />Other Corps personnel, the local project sponsor, and <br />higher level reviewers will also have useful suggestions <br />and information that will be valuable in establishing the <br />overall scope and procedures for the hydraulic analysis. <br />All of this information should be summarized in a writ- <br />ten document, called a HEMP (Hydrologic Engineering <br />Management Plan) which guides the hydraulic engineer <br />through the course of the analysis. The HEMP is a <br />detailed worlc outline covering the complete technical <br />study. It should be the flfSt significant item of worlc <br />completed by the hydraulic engineer and should be <br />updated during the study process as new insights are <br />gained. The purpose of this chapter is to present the <br />ingredients needed 10 develop this document. Additional <br />information about a hydraulic worlc plan is given in <br />Appendix C. <br /> <br />a. Project objectives. The objectives of a proposed <br />project are usually broad. For the majority of Corps' <br />worlc, these objectives are to provide flood control, <br />and/or navigation to a specific reach of stream or an <br />entire river basin. Other objectives often include hydro- <br />power, river stabilization, water supply and conservation, <br />ground water management, permits, recreation, and envi- <br />ronmental and water quality enhancement. For a project <br />involving many of these objectives, the hydraulic engi- <br />neer may require consultation with outside experts. <br />Personnel from HEC, WES, the Hydrology Committee, <br />various centers of expertise in Corps Districts, state agen- <br />cies, universities, or private consultants can provide assis- <br />tance in developing the hydraulic study scheme and in <br />making decisions regarding selectinn of appropriate <br />hydraulic analysis tools. <br /> <br />EM 1110-2-1418 <br />15 Oct 93 <br /> <br />b. Study objectives. Once the project Objectives are <br />established, specific elements of the hydraulic analysis <br />can be addressed. Development of the study plan <br />requires establishment of appropriate levels of detail <br />commensurate with the particular study phase. The <br />appropriate level of hydraulic analysis detail is a key <br />issue in most studies affecting, perhaps drastically, both <br />the time and cost of the effort. This issue is often a <br />major matter that should be resolved between the hydrau- <br />lic engineer and the study or project manager early in the <br />study. <br /> <br />(I) The hydraulic engineer must be knowledgeable <br />of the planning process and design the analysis 10 meet <br />the requirements of any particular reporting stage of the <br />study (reconnaissance versus feasibility versus design). <br />The engineer must be prepared to explain why a certain <br />level of detail is needed, and why short-cut/less costly <br />methods (or more expensive methods) would not (or <br />would) be necessary and appropriate at particular stages <br />of a study. Frequent and clear communications with the <br />study team and development of a HEMP will facilitate <br />specification of the appropriate levels of study detail. A <br />justifiable H&H study cost estimate cannot be made <br />without first developing an H&H worlc plan. <br /> <br />(2) Level of detail for the feasibility stage should be <br />determined during the reconnaissance phase. Assuming <br />Federal interest is found during the reconnaissance study, <br />the most important work done in the reconnaissance <br />report is to itemize all perceived problems and data needs <br />and document how the study team proposes to address <br />them in the later reporting stages. The reconnaissance <br />report is the instrument used 10 defme the level of detail <br />required for the feasibility report stage. Table 3-1 over- <br />views the objectives and level of detail typically required <br />in the Corps' reporting process; particular circumstances <br />may require a different blend of requirements and <br />objectives. <br /> <br />3-2. OVelVlew of Techniques for Conducting <br />River Hydraulics Studies <br /> <br />A general overview is given below; the following chap- <br />ters discuss various technical approaches in detail. <br /> <br />a. Field data. Field (prototype) data collection and <br />analysis serves both as an important aspect of the appli- <br />cation of other methods and as an independent methud. <br />It is an indispensable element in the operation, calibra- <br />tion, and verification of numerical and physical models. <br />Also, to a limited extent, field data can be used 10 <br /> <br />3-1 <br />
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