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FLOOD04263
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Last modified
1/25/2010 6:45:45 PM
Creation date
10/5/2006 12:30:12 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Design of Open Channels
Date
10/1/1977
Prepared By
USDA Soil Conservation Service
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Z-10 <br /> <br />1. Proposed channel alignment with bearings or azimuth should be <br />shown for each tangent. Curve data is usually not needed at this <br />stage or development. <br /> <br />e <br /> <br />Z. Proposed grade and water surface profile should be shown on the <br />profile including pertinent elevations and invert gradient. <br /> <br />3. Typical cross 'sections showing existing and proposed sections one <br />for each type or size of proposed section should be included on <br />each sheet of plan-profile. <br /> <br />4. If structures are proposed for the project, a drawing of a typical <br />structure showing general dimensions should be included. <br /> <br />5. Drawings, sketches, cross sections or photo montages should be <br />included to illustrate how the proposed project will appear in the <br />surrounding landscape. <br /> <br />Profile and cross sections may be omitted in reaches to be cleared and <br />snagged only. <br /> <br />A horizontal scale of 1 inch = ZOO ft. to 1 inch = 1000 ft. for plan-profile <br />is usually adequate for preliminary drawings. If the original plot of <br />survey data can be made to the same scale as that needed for drawings, <br />considerable time and effort will be saved. <br /> <br />e <br /> <br />Documentation <br /> <br />All data developed during the planning phase should be properly documented <br />and filed. This will insure that such data will be of maximum use for <br />future reference. All notes, computations, and drawings should be properiy <br />identified and be complete so that they can be used in preparing detailed <br />plans for design and construction. The data should be dated, since Service <br />criteria are modified from time to time. All papers should show the <br />initials of the person preparing the data sheets or making the computations. <br />A reference should be made to indicate the methods or source of data <br />used. <br /> <br />Survey for Final Design <br /> <br />General Requirements <br /> <br />The section covering "Design Surveys - Surface Drainage" in the National <br />Engineering Handbook Section 16,y Chapter Z, will serve as a useful <br />reference for final design surveys, where applicable. As indicated in <br />the NEH, a staked base line is required. An exception to this requirement <br />may be made where clearing and snagging is the only work needed to <br />provide the desired level of protection. For this condition, no additional <br />surveys over those recommended for planning may be needed for design <br />purposes. However, sufficient data must be obtained to permit the <br />determination that this treatment will result in a stable channel which <br /> <br />e <br /> <br />~ <br />
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