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<br />Elevation .Q..i Strllctur~s Q1l Piles .QL Fill <br /> <br />~ <br /> <br />Susceptibility <br />Unarmored fill is highly susceptible to erosion <br />damage, potentially causing undermining of the <br />associated home. Adequate armoring is essential. <br />Scour around piles, if severe, could cause failure <br />of one or more piles. Piles must be driven down to <br />below the maximum possible scour depth. <br /> <br />Effectiveness <br />Elevation on piles allows unhampered flow under <br />structures and minimizes scour and deposition <br />hazards. Structures on piles have minimal <br />influence on flood path and hydraulics. <br />Elevation on fill (even if armored) can <br />bbstruct the flow and increase ~elocities and <br />erosion in .adjacent properties. <br />~levation on fill is effective only when <br />armored and used in combination with upstream <br />dikes and channelized streets. <br /> <br />Public Acceptance <br />Elevation on piles has not been well received <br />due to aesthetic problems. safety problems for <br />children. and access difficulties. <br />Elevation on fill has been used <br />extensively, but without sufficient regard <br />for scour and flow conveyance problems. <br />Costs are low and typically paid by <br />developers. <br /> <br />Required Maintenance <br />Inspection and repair after floods. <br /> <br />84 <br />