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City of Rifle Flood Hazard Mitigation Plan certain situations, when flooding is of very low level, usually less than one foot, some method of enclosing low entrances such as basement doors or window wells might be a satisfactory option. In any case, there are a number of elements involved in designing and using a closure system. In areas of shallow, low-velocity flooding, closures can be used on doors, windows, vents, and other building openings. However, the first step with the use of closures placed directly on buildings is to be certain that both the closure and the wall systems are strong enough and sufficiently watertight to withstand flood pressures. The use of closures directly on a structure is considered to be part of the sealing process. Closures can be considered as an option only if a flooding situation provides sufficient time to install the closures. The need for both warning time and "human intervention" is critical, since all closure system require personnel to install them and make certain they are properly sealed. Closures that are stored between floods must be readily accessible. The effectiveness of an entire closure system will be compromised if the closures are stored such that flooding renders theminaccessible, or if even one closure is improperly installed. For most flooding situations, a homeowner should consult with a professional engineer to be certain that the closure system being planned can withstand the hydrostatic and hydrodynamic pressures that will be involved. Low Profile Permanent Closures ," i For cases involving flood levels of up to two feet, a type of "mini-flood wall" can be used to permanently protect various types of openings. Possible materials for this use include brick, concrete block and poured concrete. The figure above shows a wall around a window well. For flooding around a basement door, a low wall around the entrance may be the solution, as I shown. Though the "mini"-walls may not require the degree of reinforcing of larger flood walls, they should be supported by and securely tied unto a footing sQ. that they will not be undercut by scouring. &ample "Mini" Floodwall for Window. Sandbagging AI; a last resort or during emergencies, sandbags can keep water away from vulnerable property. However, flood proofing measures and moving contents out of the way are much more secure methods to accomplish the same thing. Additionally, sandbagging can be very expensive. A community plan for sandbagging requires Flood side House side ,,,.' Bonding trench &ample ofSaruJ-Bag Wall 15