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<br />Makin2 Structures Yaterti2ht bv Usin2 Closures and Sealants, <br /> <br /> <br />Plastic, marine paints, bentonite, and other waterproofing compounds <br /> <br /> <br />and sealants can be applied to structures, providing the structures <br /> <br /> <br />can withstand the hydrostatic and hydrodynamic pressures. Of the <br /> <br /> <br />paint-on type macerials, research conducted at the Corps' Yaterways <br /> <br /> <br />Experiment Station indicates that those with cementitious bases are <br /> <br /> <br />generally superior. Yith this waterproofing method, the foundation <br /> <br /> <br />must be designed to withstand uplift forces. A variety of closure <br /> <br /> <br />designs may be used, ranging from single plywood sheets to expensive <br /> <br /> <br />steel stoplogs, It is extremely difficult to make closures completely <br /> <br /> <br />watertight, and many systems using this technique allow for some <br /> <br /> <br />leakage by employing pumps to evacuate the leakage. No attempts <br /> <br /> <br />should be made to seal a structure against floods deeper than 1.5 to 2 <br /> <br /> <br />feet until the structure has, been examined by a qualified professional <br /> <br /> <br />engineer to determine chac it can withstand the increased loads, A <br /> <br /> <br />disadvantage to this syscem is thac human intervention is necessary to <br /> <br /> <br />make it effectiv.e. Often, war:ning time is not' sufficient to allow <br /> <br /> <br />implementation of the system. This could be a problem for successful <br /> <br /> <br />implementation in Placce Center. <br /> <br />Yet Flood Proofin~, This method involves construction with <br />materj.als that will sustain minimal or no damage when flooded. The <br />~ ~ . .... <br />only contents that should be locaced in floodable areas are those that <br />can be easily moved or those that will be minimally damaged. Contents <br />that could become hazardous or create a pollution problem during a <br />flood should not be stored in floodable areas. An advantage to this <br />method is that hydrostatic loading is neutralized avoiding <br />overstressing of the walls and foundation. Any amount of wet flood <br />proofing can result in reduced damages; howaxer, with this method, the <br />"- <br />homeowner is still faced with after-flood cleanup, repairs, and other <br />problems not associaced with dry flood proofing. <br /> <br />31 <br />