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Low dam and High dam, A Gravity Dam is said to be low or high according to its height as, H = f/w(1+s), Where,, H = Height of dam, f = Compressive Strength of the Dam, w = Specific weight of water, s = Specific Gravity of Dam Material, , , Low dam, Its height is less than H = f/w(1+s)., It has a structural height of up to 100 feet., The resultant of all forces travel through the middle third of a low dam, and the highest, compressive stress at the toe does not exceed the allowed limit., , , , High dam, Its height is greater than H = f/w(1+s)., It has a structural height of over 300 feet., For the same reason, the downstream slopes are made flatter in High Dams. Also, a slope, of 1 in 10 is given in the lower portions of the upstream side of the dam.
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Gravity dams can be classified with respect to their structural height:, , , , , Low, up to 100 feet., Medium high, between 100 and 300 feet., High, over 300 feet.
