The Effect of Silting on Flow Profile Upstream of Weirs—A Case Study

In a case study for finding the discharge coefficient of an existing weir in Madhya Pradesh by model experiments, it was found that for the same flow intensity, the depth of flow over crest reduced due to silting upstream of the weir. The flow profiles upstream of the weir for original as well as present bed levels have been worked out by “Standard stop Method”, and it is noticed that although the water level on crest reduces due to silting, the flow profile rises sharply and exceeds the designed levels in a short distance upstream of the weir. The maximum additional afflux occurs at a section upto which the silting has extended. These details have been reported in this paper. This leads to the necessity of finding out silting pattern upstream of existing weirs in tho country, so that criteria could be developed for future designs to suit actual conditions under which the weirs have to function.