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According to thin cylinder theory, the volume of concrete required for an arch dam would be minimum if the central angle is ____________

According to thin cylinder theory, the volume of concrete required for an arch dam would be minimum if the central angle is ____________ Correct Answer 133° 34’

The most economical central angle is equal to 133°-34’ and such an angle can be adopted only at one place in constant radius arch dam as there is considerable variation with height due to narrow V-shape of the valley. It is therefore considered to keep the economical angle of 133°-34’ at about mid-height for a minimum value of concrete.

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