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<br />considered for the operation of closure structures (e.g., gates <br />or stoplogs) in a levee system designed to provide at least <br />lOO-year flood protection, including adequate freeboard as <br />described above, provided such operation is specifically <br />included in the community's adopted emergency response plan. <br /> <br />- <br />F. Analysis. For the area protected by a levee providing less <br />than IOO-year protection, lOO-ye~r flood elevations shall be <br />computed as if the levee did not exist. For the unprotected <br />area between the levee and the source of flooding, the <br />elevations to be shown shall be obtained from either the flood <br />profile that would exist at the time levee overtopping begins <br />or the profile computed as if the levee did not exist, <br />whichever is higher. <br /> <br />This procedure recognizes the increase in flood elevation in <br />the unprotected area that is caused by the levee itself. This <br />procedure may result in flood elevations being shown as several <br />feet higher on one side of the levee than on the other. Both <br />profiles should be shown in the final report and labeled as <br />"before levee overtopping" and "after levee overtopping," <br />respectively. <br /> <br />-21- <br />