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<br />Lesson 2 <br /> <br />Basic Hydraulics - Participant Workbook <br /> <br />ESTIMATING TAllWATER <br /> <br />STAGE-DISCHARGE CURVE <br />882 <br /> <br /> <br />880 <br /> <br />. MEASURED RATING CURVE <br />. NEGLIGIBLE TAllWATER <br />. CONSTANTTAllWATER <br />lEVEL <br />. STAGE-DISCHARGE CURVE <br /> <br />~ 876 <br />o <br />'.; 876 <br />> <br />~ <br />iii 874 <br /> <br />672 <br /> <br />670 <br /> <br />o 100 200 300 400 500 800 <br />Discharge <br /> <br />2.23 Stage Discharge Curve <br /> <br />2.22 Tailwater Strategies <br /> <br />1. Measured Rating Curve <br /> <br />If measured data is available, a rating curve may be used to describe the <br />tailwater characteristics. <br /> <br />2. Negligible Tailwater <br /> <br />Where flow is not concentrated or there is small discharge with indefinite <br />outfall channels, tailwater may be found or assumed as negligible. <br /> <br />3. Constant Tailwater Level <br /> <br />. In instances of irrigation channels or constant level outfall situations, a <br />constant value for the tailwater may be used. <br />. A properly developed culvert performance curve usually should be <br />supported by a stage-discharge relationship. <br /> <br />4. Stage vs. Discharge Curve <br /> <br />When a measured rating curve does not exist and tailwater may not be <br />neglected or assumed constant, it usually is necessary to develop a <br />stage-discharge curve. <br /> <br />2-14 <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 />