Abstract
The loose non cohesive material through which a riv er flows is generally called sediment. Local scour at piers and abutments is the main reason for the collapse of bridges founded in alluvial sediments. Clear water scour refers to the situation where no sediment is supplied by the approaching flow in the zone of sco ur. Many investigators have studied various aspects of scour. However, the study on scour under steady condition for same discharge with same depth of flow for different pier diameter s is limited. In present study laboratory experiment was conducted on different pi er sizes of circular piers by keeping discharge con stant under clear water scour condition. It is found that Non dimensional scour d epth gradient is different up to opening ratio 0.8 having less slope and its slope is steep above 0.8 opening ratio.
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