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<br />Lesson 3 <br /> <br />Culvert Design - Participant Workbook <br /> <br />3.8 PERFORMANCE CURVES <br /> <br /> <br />PERFORMANCE CURVES <br /> <br /> <br />G,m~! G"/"!~-,,. <br />Q;"(,Q <br /> <br />~FI<>........ <br />-1-- <br /> <br />_!:".!'~~!I : <br />~,~ <br /> <br />i <br /> <br />. A PERFORMANCE CURVE IS A PLOT OF HW <br />VERSUS Q <br />. PERFORMANCE CURVES USED TO: <br />- evaluate consequences of higher Q <br />- evaluate benefits of inlet improvements <br />. A PERFORMANCE CUREVE IS DEVELOPED <br />FROM BOTH INLET AND OUTLET CONTROL <br />CURVES, WITH MINIMUM PERFORMANCE <br />CONTROLLING <br /> <br />IfJl~rComroi <br />CUI'I<!! <br /> <br />,... uo ..00 u. <br />,,~ <br /> <br />3.26 Performance Curves <br /> <br />3.27 Performance Curve Example <br /> <br />A. A performance curve is a plot of headwater depth or elevation versus flow <br />rate. <br /> <br />B. A performance curve can be used to evaluate the consequences of higher <br />flow rates, such as the potential for overtopping the roadway if the design <br />event is exceeded, or to evaluate the benefits of inlet improvements. <br /> <br />C. In developing a performance curve both inlet and outlet control curves <br />must be plotted, since the dominant control is hard to predict and may <br />shift over a range of flow rates. <br /> <br />3-12 <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 />