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<br />. <br /> <br />filled to the elevation oftl1e dam's emergency spillway and the 100-yearhydrology can <br />be routed through the reservoir to account for any flood attenuation effects. <br />C. Adequate Assurances. For the purposes of Rule 8.B. "adequate assurances" shall, at a <br />minimum, include appropriate recognition in tl1e community's adopted master plan of: <br />(1) the flood routing capability ofthe reservoir, as shown by comparison of the 100- <br />year floodplain in plan and profile witl1 and without the dam in place in order that the <br />public may be made aware of the potential change in level of flood protection in the <br />event that the reservoir flood routing capability be lost, (2) tl1e need to preserve that <br />flood routing capability by whatever means available in the event that the reservoir <br />owners attempt to make changes that would decrease the flood routing capability, and <br />(3) a complete Operations and Maintenance Plan. <br /> <br />In addition, an agreement shall be executed between the Board (or the Urban Drainage <br />and Flood Control District on behalf of the Board if the floodplain below the dams in <br />their jurisdiction), and the affected local governments which expressed the intent of the <br />parties to assure that the flood routing capabilities of the reservoir will be maintained by <br />whatever means are available when and if the reservoir owners attempt to make changes <br />which would reduce the flood routing capability. <br /> <br />. <br /> <br />Rule 9. Criteria for Determininl!: Effects of Levees on Rel!:ulatorv Floodplains: <br />A. Ownership. Privately'owned, operated, or maintained levee systems will not be <br />considered in the hydraulic analysis to be performed pursuant to rule 5 or rule 6 unless <br />a local ordinance mandates operation and maintenance oftl1e levee system and the <br />criteria set forth below are met. Levees for which the community, State, of Federal <br />government has responsibility for operations and maintenance will be considered <br />provided that the criteria set forth below are met. <br /> <br />B. Freeboard. A minimum levee freeboard of 3 feet shall be necessary, witl1 an <br />additional I-foot of freeboard within 100 feet of either side of structures within the <br />levee or wherever the flow is constructed such as at bridges. An additional O.5-foot <br />above this minimum is also required at the upstream end, tapering to the minimum and <br />the downstream end of the levee. <br /> <br />C. Field Inspection and Maintenance. The levee shall be structurally sound and <br />adequately maintained. Sedimentation effects shall be considered for all levee <br />projects. Certification from a federal agency, state agencl',-p!....a registered professional <br />engineer that tl1e levee meets the minimum freeboard criteria as stated above and that it <br />appears, on visual inspection, to be structurally sound and adequately maintained shall <br />be required on an annual basis. Levees tl1at have obvious structural defects, or that are <br />obviously lacking in proper maintenance, shall not be considered in the hydraulic <br />analysis. <br /> <br />D, Internal Drainage. Where credit will be given to levees providing 100-year <br />protection, the adequacy of interior drainage systems shall be evaluated. Areas subject <br />to flooding from inadequate interior drainage behind levees will be mapped using <br />standard procedures. <br /> <br />. <br /> <br />15 <br /> <br />DRAFT <br />