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<br />- <br />- <br />- <br />"' <br />CI) <br />Cl <br />0 <br />E <br />0 <br />0 '" <br /> ... <br />"0 <br />0 <br />0 <br />lL. <br />" <br /> <br /> <br />UI <br />U2 <br /> <br />"No Improvement" Curve for Ultimate Development <br />11 II . <br />Improvement Curve for Ultimate Development <br /> <br />"No Improvement" Curve for Existing Development <br />"Improvement" Curve for Existing Development <br /> <br />EI <br />E2 <br /> <br /> <br /> <br /> <br /> <br />12 4 10 20 30 40 50 <br />(100) (25) (10) (5) (2) <br />Probability of Exceedence in Percent per Year <br />(Return Interval in Years) <br />Figure 111-2. Sample Damage-Frequency Curves Generated from the Initial Drainage Study. <br />