Flood Protection Design Features

Claudette Reichel  |  6/25/2008 12:12:47 AM

Figure 1, Elevated Mechanical System

Decks and porches built and anchored to resist flood forces: Decks, porches, carports and other exterior structures that attach to your home will be exposed to the same flood forces as the house. Although these can be designed to break away from your house without damaging it, this is not recommended. You could suffer the loss of the attached structures, and this could allow parts of your home to be thrown against other people’s property. All exterior structures attached to your home should be firmly connected to the house and securely anchored on the sides away from the house.

Garage, driveway, entries, patios and grounds sloped away from house: To prevent wind-blown water from entering the house, any paved surfaces adjacent to the house and capable of collecting and channeling water should be at least 4 inches below the living floor. They should also slope away from the house at a minimum slope of 1 inch per 20 feet. Unpaved areas should be at least 8 inches below the bottom of the first floor and slope at least 6 in. per 10 ft.

HVAC, electrical and mechanical systems elevated: Elevate electrical wiring, plumbing outlets, heating, ventilation and air conditioning equipment and other mechanicals to the same level of protection as the main structure. Parts of elevated systems that must extend below BFE should be designed to prevent entry of floodwater.  (Figure 1, Elevated Mechanical System)

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