Laserfiche WebLink
<br /> <br />sheets of polyethylene (Poly) should be used on the water side of <br />the sandbag line to reduce the problem of water seepage and need <br />for pumps. When completed, a properly built sandbag line should <br />look as neat as a brick wall. <br /> <br />Notes <br /> <br />Flashboards may be used if the required capping exceeds 1.5 <br />feet, but is less than 3 feet, or if the capping is likely to be exposed <br />to wave action or erosion. Essentially, a board fence is built <br />approximately 2 feet from the riverside edge of the levee crown. <br />Earthfill is used on the landward side to reinforce the fence and <br />provide reinforcement against the hydrostatic load of the flood <br />waters. It is essential that all fill is tamped into place and that <br />proper construction methods are used throughout the process. <br /> <br />Flashboard Capping <br /> <br />Advantages: <br /> <br />-J Relatively easy to construct <br />-J Provides some current protection <br />-J Does not require heavy machinery on levee <br /> <br />Disadvantages <br /> <br />-J Labor intensive to construct <br />-J More expensive than previous methods <br />___ _ _ ___ _ ~-'V'--R1lquires-quaHty-constructiorr---------- ---- ,,~- --- n____ -- - . <br /> <br />There are two classes of flashboard caps. Two-board capping <br />is used in situations that require less than 2 feet of added height. <br />Three-board capping is used in situations requiring up to 3 feet in <br />added height. The basic construction methods are essentially the <br />same. Only normal handyperson skills are required. <br /> <br />The construction of flashboard caps requires a moderate sized <br />workforce. A large quantity of hand tools are needed including <br />shovels, saws, hammers and wheelbarrows. Quality control is an <br />important issue during flashboard construction and it is essential <br />that the flashboards are properly backfilled to prevent water <br /> <br />Page4-7 <br />