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<br />26 <br /> <br />The next step is to determine the variation of benefits, or flood <br /> <br />damage reduction, with design frequency, This is done by preparing <br />damage-frequency curves for the reach for several alternative design <br /> <br />frequencies, <br /> <br />Figure 11-6 shows four damage frequency curves for the reach <br />corresponding to no change and designs for 2, 10 and 100-year designs, <br />(See Appendix A for instructions regarding preparation of damage- <br />frequency curves). Essentially these curves show the damage which <br /> <br />will still occur after installation of flood protection if floods <br /> <br />greater than those designed for occur, <br /> <br />.... <br />- <br />en <br />w <br />(!) <br /><I: <br />~ <br /><I: <br />Cl <br /> <br /> <br />:- _ <NO CHANGE <br />............... ......... <br />-" "- <br />\ 2-YEAR~ " <br /> <br />~IO- YEAR . \\ <br />I \ <br />IOO-YEAR <br /> <br />'" <br />o <br /> <br />o 0,1 <br /> <br />0,2 0,3 0.4 0,5 0,6 0,7 <br /> <br />EXCEEDANCE PROBABILITY <br /> <br />Figure 11-6 <br /> <br />The areas under the curves give "average annual damages." Damages <br /> <br />prevented by the systems may be found by subtracting as shown by <br /> <br />Table II-8, <br />