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<br /> <br />Detail 1 <br /> <br />Detail 2 <br /> <br /> <br /> <br />. '" <br />"I" <br />:: '~. <br />J.:: . <br />" <br />'//. . <br />.'. . <br /> <br />altered land forms on the flooding levels elsewhere in the <br />watershed system. <br />Another approach to elevating buildings is to raise <br />them on some form of stilts, such as piers, posts, or col- <br />umn~ This method puts the building above the base <br />flood level and leaves the ground level predominantly <br />open The open ground offers the advantage of not im- <br />peding the flow of flood water or displacing a significant <br />volume of water, thus being less likely to increase down- <br />stream or upstream flood levels. <br />In using stilt>;, the designer must consider the size <br />and spacing of stilts to ensure adequate support with <br />minimum obstruction Stilts should penetrate to bearing <br />soil and be firmly anchored to ensure that they will be <br />able to resist vertical and horizontal water pressure and <br />debris impact loads. <br />Extended foundation walls can also be used to ele- <br />vate buildings above flood levels. However, the vertical <br />surfaces of walls can obstruct the flow of water and are <br /> <br />~ <br /> <br />Buildings can be raised <br />above the BFE on posts, <br />piers, or columns. They <br />must be securely anchored <br />to the stilts, which in turn <br />must be anchored to foot- <br />ings. Stilts would be se- <br />cured in tbe ground by <br />backfilling. <br /> <br />Detail 3 <br /> <br /> <br />This beach house has been <br />elevated on concrete piers <br />to minimize flood damage. <br /> <br /> <br />~ i" # ~ <br />"~' .J~"",; " <br />a~~, ......~ <br />Department of HOU'iing and Urban Development <br /> <br />67 <br />