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<br />- <br />,~ ~)3 <br />G~\J';:-t <br /> <br />.. ' <br /> <br />Dam Types <br /> <br />Concrete: <br /> <br />Arch Dam. - A concrete or masonry dam which is curved upstream in plan so as to <br />transmit part of the water load to the abutments. <br /> <br />Thin Arch. - An arch dam with a base thickness to structural height ratio of 0.2 <br />or less (previously listed as 0.3 or less).* <br /> <br />Medium-thick Arch. - An arch dam with a base thickness to structural height ratio <br />between 0.2 and 0.3 (previously listed as between 0.3 and 0.5)* <br /> <br />Thick Arch. - An arch dam with a base thickness to structural height ratio of 0.3 <br />or greater (previously listed as 0.5 or greater).* <br /> <br />Double Curvature Arch Dam. - An arch dam which is curved in plan and elevation, <br />with undercutting of the heel and a downstream overhang near the crest of <br />downstream cantilever. <br /> <br />Buttress Dam. - A dam consisting of a watertight upstream part supported at <br />intervals on the downstream side by a series of buttresses (walls normal to the <br />axis of the dam). <br /> <br />Multiple Arch Dam. - A buttress dam, the upstream part of which comprises a <br />series of arches. <br /> <br />Flat Slab or Slab and Buttress. - A buttress dam with buttresses which support <br />the flat slab of reinforced concrete which forms the upstream face. <br /> <br />Massive Head Buttress. - A buttress dam in which the buttress is greatly enlarged <br />on the upstream side to span the gap between buttresses. <br /> <br />Gravity Dam. - A dam constructed of concrete and/or masonry which relies on its <br />mass for stability. <br /> <br />Arch-Gravity Dam. - An arch dam which is only slightly thinner than a gravity <br />dam. <br /> <br />Curved Gravity Dam. - A gravity dam which is curved in plan. <br /> <br />3 <br />