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<br />Dynamic Loads: Dynamic loads are shocks and pressures that may accompany <br />a flood. Their effects on a building must be added to the static lateral <br />load. Dynamic loads can be caused by wind, current, ice, and debris. <br />The effect of a current moving slower than three feet per second is neg- <br />ligible. Because most houses in Illinois do not have to worry about <br />dynamic loads and because protection measures should be prepared by a <br />structural engineer, they are not discussed here. <br /> <br />Advantages of Dry Floodproofing <br />All contents of the house a re kept dry. <br /> <br />If the flood depth is less than 2 feet, the measures to take <br />could be simpler and cheaper than levees or floodwalls. <br /> <br />Problems of Dry Floodproofing <br /> <br />Sewer back-up must be prevented. <br /> <br />There will normally be no reduction of regular program <br />insurance rates. <br /> <br />Dry floodproofing measures can fail or be overtopped by <br />large floods. If this happens, the effect will be as if <br />you had no protection at all. <br /> <br />Failure to properly estimate various loads could cause <br />walls to collapse and/or floor to buckle. <br /> <br />Not applicable to wood frame houses without brick or <br />masonry veneer. <br /> <br />Closing some openings may be dependent on human intervention <br />(see I.H., below) <br /> <br />Costs: Vary depending on flood heights and type of house. <br />Seal ing wall s. <br /> <br />Closures for openings. <br /> <br />Subsurface drainage. <br /> <br />E. Wet Floodproofing <br /> <br />Most of the expense and dangers involved in dry floodproofing are caused <br />by the tremendouse pressures which deep water will place on the struc- <br />ture. Wet floodproofing is the cheapest method to alleviate these <br />dangers. <br /> <br />17 <br />