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<br />72 <br /> <br />Closure devices should be inspected annually and maintained to preserve structural and <br />waterproof qualities. To improve the effectiveness of this type of flood proofing measure, it is <br />recommended that an operations plan be developed and placed on the site. The plan should <br />include, but not limited to, the following considerations: <br /> <br />The warning time required to install closure devices must be determined. <br /> <br />Drills must be conducted to make sure that closure units and fittings are on the site. <br /> <br />Inspections must be conducted to assure that opening sealants are present for all <br />openings. <br /> <br />Sewer and drain lines must be equipped with backflow devices. <br /> <br />8.4 Illustration of Closure Types <br /> <br />Openings are grouped according to function, and different possible closure types are illus- <br />trated for windows, Figures 8.1 through 8.6; doors, Figures 8.7 through 8.10; vents and shafts, <br />Figures 8.11 and 8.12. Other closure types are shown in Figures 8.13 through 8.16. Some <br />arrangements may be modified for other applications. The more frequently used closures for <br />residential, commercial, and industrial structures are shown. For vertical openings, the closure <br />may cover the whole opening or only enough of the opening for adequate flood protection. <br />A one foot freeboard allowance above the BFE should be included in this kind of closure. <br /> <br />Low outdoor walls may be considered a closure method when built around basement stair- <br />wells, or when used to protect a structure, or a portion of a structure, with many openings. <br /> <br /> <br />:z:.... <br /> <br /> <br /> <br />--- <br /> <br />Figure 8.1. Display window shield lowered by pulley system. (Reference 33) <br />