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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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Template:
Floodplain Documents
County
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 />EM 1110-2-1416 <br />15 Oct 93 <br /> <br />T..... W <br />Model Ueage IlI8'ing Hy....1ic s....... For NIIv1getion Projecl8 <br />Stage Existing Data GVSF MB <br />& Criteria. <br /> <br />Reconnaissance <br /> <br />x <br /> <br />x <br /> <br />GVUSF <br /> <br />Multi-D <br /> <br />Phys: <br /> <br />e <br /> <br />Feasibility <br /> <br />x <br /> <br />X(l) <br />X <br /> <br />Re-&Veluation <br /> <br />X <br /> <br />General Design <br />Memo. <br /> <br />Feature Dasign <br />Memo. <br /> <br />Continuing <br />Authorily <br /> <br />X <br /> <br />X <br /> <br />. <br />'~ <br /> <br />. As defined in Table 3-2. <br /> <br />? As defined in Table 3-2, <br /> <br />? <br /> <br />? <br /> <br />? <br /> <br />? <br /> <br />? <br /> <br />? <br /> <br />X <br /> <br />X <br /> <br />X <br /> <br />X <br /> <br />X <br /> <br />X <br /> <br />. <br /> <br />X(I) <br /> <br />(2) <br /> <br />? <br /> <br />(2) <br /> <br />(1) Sediment problems must be addressed at this stage. either quanlitati\l&ly or qualitalively, Detailed movable boundary analysis w~h <br />computer modeling is more likely althis stage for a navigation projeclthan for a flood conlrol project. <br /> <br />(2) Nevigation projects for this stage are typically small boat harbor or off.channel mooring facilities of rather uncomplicated design. <br />GVUSF or multidimensional modeling techniques ate normally not utilized. A field survey during tha reconnaissanca and data gathering <br />stages of a study by the responsible hydraulic engineer is assential. <br /> <br />to a specific flood frequency, or design event, while <br />navigation studies use a discharge for a specific low flow <br />duration or frequency. The single discharge value for the <br />hydraulic design should not be over-emphasized; rather, <br />project performance must be evaluated for a range of <br />flows, both greater than and less than the "design dis- <br />charge." A levee may be designed 10 provide protection <br />from the one-percent chance flood, but the levee design <br />must also consider what happens when the 0.5- or <br />0.2-percent chance or larger flood occurs. A channel <br />may be designed to contain the IO-percent chance flood, <br />but the annual event may be the most dominant in terms <br />of forming the channel geometry 10 carry the stream's <br />water/sediment mixture. In some cases, the absence of a <br />low flow channel 10 carry the everyday water and sedi- <br />ment flows has caused the IO-percent chance channel to <br />be quickly silted up. Similarly, steady flow evaluations <br />may be insufficient to adequately evaluate project perfor- <br />mance. Full hydrographs or sequential routings for a <br />period of record may be required to address the project's <br />response to sediment changes or the occurrence of con- <br />secutive high or low flow periods. Velocities are impor- <br />tant for water quality, riprap design, and other <br />engineering studies. Velocity for the peak design flow <br /> <br />e <br /> <br />3-3. Analysis of Hydraulic Components <br /> <br />Most problems that are studied have solutions that <br />include hydraulic structures that are identified early in <br />the reconnaissance phase. Different types of structures <br />require different methods for proper evaluation. General <br />guidance for method selection is given in Table 3-4 for <br />flood control, navigation, and hydropower projects. The <br />study objectives, along with the type of hydraulic compo- <br />nentlo be evaluated, should indicate the type of analysis <br />required. <br /> <br />3-4. Data Requirements <br /> <br />There are three main categories of data needed for <br />hydraulic studies: discharge, geometry, and sediment. <br />Not all of these categories, or all of the data within each <br />of these categories, will be needed for every study. <br /> <br />a. Discharge. <br /> <br />(I) A project is usually designed to perform a func- <br />tion at a specific discharge. It must also function safely <br />for a wide range of possible flows. Flood control pro- <br />jects are usually designed for the discharge corresponding <br /> <br />3-4 <br /> <br />! <br /> <br />I <br />" <br /> <br />e <br />
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