Use the damage–frequency relationships in Table 13.9 for flood control alternatives to rank their merits based on expected flood damage reduction.

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TABLE 13.9 Damage-Frequency Relationships in Example 13.2 Exceedance Damage Damageb Damage Damaged Probability (%) ($10%) ($10%) ($106) ($106) Damage ($106) 20 0 0 0 0 0 10 6 0 0 0 0 7 10 0 0 0 0 5 13 13 2 4 3 2 22 22 10 1 30 30 20 0.5 40 40 30 27 0.2 50 50 43 40 0.1 54 54 47 43 0.05 57 57 55 50 282448 12 10 18 12 21 35 45 56 Existing condition. b Dike system. Upstream diversion. Channel modification. e Detention basin.