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82 ,r------~~ ~0 l<'~cl <.. >\ --'-- -"-~ . ?~ /Y o [ A , f. f' I I 7/0- f~' ~~~~.~~ "'I:r.'i>'.,4',,"~ .~ ~ . ) ) . - ASPHALT SEALANT FLOOR PRESSURE PLUG Figure 9.2. Basement floor blow-out plug. (Reference 9) However, even if a potable water flooding system is used, it is best to have a backup system using floodwater for emergencies. All spaces, ine:luding cavity walls, must be allowed to fill with water and should be easily drainable as water recedes. When using internal flooding, it is imperative that utilities and mechanical systems be either located above BFE or waterproofed and firmly secured in place. Fuel and chemical storage tanks must be located above the BFE. Valves th~t maintain equalized water pressure and cleanup equipment must be included in an internal flooding sys~em. This method of wet flood proofing will obviously not lessen contents damage to any signifi- cant degree. Applications where it would be mOst useful are certain industrial buildings, existing structures, and limited-use basements. Before cleanup begins, precautions should be taken to insure the safety of all utilities that could be affected by the flood. When removing the inside water after the flood, an automatic draining system should pump water Out at a rate that keeps inside water elevations approximately equal to the receding floodwater elevation. 9.3 Insurance Considerations Although internal flooding may be useful in some situations, it is not recognized as a valid flood proofing method by the Federal Emergency Management Agency. On the Floodproofing Certificate, it is asked whether floodproofing is achieved with human intervention. Human intervention is defined as allowing water to enter the building, or filling of foreign waters, when a flooding condition is occurring. When this type of measure is implemented, the following flood insurance rating considerations should be acknowledged: Intentional flooding is not recognized as a rate reduction measure for residential struc- tures regardless of type of procedure. Measures that require human intervention are not normally permitted for residential structures, but are for non-residential structures, and rate reductions can be obtained. However, wet floodproofing (intf'ntional floodinRl is permittf'd for non-rf'sidf'ntial strll('\lIrf's. hut no rate reductions are granted.