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Last modified
1/26/2010 10:11:05 AM
Creation date
10/5/2006 4:44:10 AM
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Floodplain Documents
County
Statewide
Basin
Statewide
Title
Culvert Design
Date
8/1/2000
Prepared By
Ayres Associates
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Lesson 2 <br /> <br />Basic Hydraulics - Participant Workbook <br /> <br />2.6 FROUDE NUMBER <br /> <br />FROUDE NUMBER <br /> <br />FLOW REGIME <br /> <br />_ WATER SURFACE PROFIL.E <br />CRITICAL DEPTH <br />_ . _ NORMAL DEPTH <br /> <br />V <br />Fr =. ~ <br />y9Y <br /> <br />5UBCR/TICAL <br /> <br /> <br />CHANNEL BOTTOM <br /> <br />2.13b Flow Regime Diagram <br /> <br />2.13a Froude Number <br /> <br />A. The Froude number is defined as <br /> <br />v <br />Fr =. ~ <br />y9Y <br /> <br />where: <br /> <br />Froude Number <br />Flow velocity (fps) <br />Acceleration of gravity (32.2 It/s2) <br />Flow depth (ft) <br /> <br />Fr = <br />V = <br />g = <br />y = <br /> <br />For irregular sections, y is the mean or hydraulic depth (y=A/T) and for <br />circular sections it is the equivalent depth (y=(A/2) 112) <br /> <br />B. The Froude number can be used to define subcritical, critical, and <br />supercritical flow: <br /> <br />Fr < 1 subcritical <br />Fr = 1 critical <br />Fr > 1 supercritical <br /> <br />1. Subcritical <br /> <br />Subcritical flow occurs when the depth of flow, velocity, and orientation of <br />flow is dependent upon factors from the point in question to downstream. <br />The flow usually has a low velocity and is described as tranquil. <br /> <br />Normal depth of flow is defined according to Manning's Equation for <br />Uniform Flow (Equation 2-4). Subcritical flow can also be defined as the <br />condition when normal depth is greater than critical depth <br /> <br />2-10 <br /> <br />2-8 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />
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