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<br /> <br /> <br />Figure 3.4b Mecklellbllrg COIIII!" Commercial Floodproofillg Audit <br /> <br />Rough sketches were prepared by the engineering finn to document the site layout, floor and wall constructiun, <br />location of openings subject to floodwater entry, and the location of pertinent utilities, plumbing, and mechani- <br />cal equipment. <br /> <br />Evaluation of Floodproofing Options <br /> <br />In evaluating floodproofing options, the objective was to provide feasible and, if possible, cost-effective <br />concepts for flood proofing the commercial properties. Techniques of dry atld wet floodproofing were <br />evaluated for each uni'lue flooding sitt.ation. <br /> <br />In all stnlctures evaluated, wet floodproofing was not a ,iable option, due to the inability of the wet flood- <br />proofing measures to prevent damage to the cuntents of the stnlcture during a flood event. Therefore, the <br />evaluation focused on the implementatinn of dry flondproofing techniques. Techniques, such as use of <br />exterior sealant, floodwalls, floodgates and flood closures and panels (lift-out :md removable) were evalu- <br />ated for their use on the selected properties. <br /> <br />Floodproofing Structures. Floodproofing techniques can provide some protection to certain <br />types of buildings. Although the NFlP does not allow new residential buildings to be floodproofed, <br />non-residential huildings can be retrofitted or floodproofed. There are two approaches to flood- <br />proufing: <br /> <br />. Dry floodproofing involves strengthening walls to vvithstand hydrostatic and d}l1amic <br />forces, including debris impacts, Openings, including doors, IVindows, and vents, are <br />sealed or filled IVith special closures to block entry of floodwater. In some instances, <br />walls can be coated IVith waterproofing compounds or plastic sheeting. <br /> <br />. Wet floodproofing intentionally allows floodwater to enter certain enclosed arC'dS to <br />reduce the damaging pressures that can collapse walls and foundations. t'looring and <br />wall materials must be resistant to flood damage, and the cnntents of floodable areas <br />should be removed when flood warnings are issued. The XFIP regulations allow wet <br />floodproofing mC'dSures, called "enclosures below base flood," only under very limited <br />circumstances in new huildings. However, such measures can he used to reduce <br />damage to existing buildings. <br /> <br />45 <br />