As laying of stone pitching and transporting of same is time taking process, we are planning to go with 100mm thick concrete panels. As IRC 89 states minimum thickness of 300mm shall be considered for stone pitching. I need to justify the 100mm thickness of concrete panels as further increase in thickness is not economical.
Pitching on the guide bunds depends upon the velocity of water in the stream as such the weight of the pitching material and size is decided. You need to design this accordingly. You may refer the material attached;
Higher thickness of stone gives more stability due to higher weight. It also help in providing grip with soil. Effect of stone pitching will be different than concrete panels of 100 mm thick . There is scope to use concrete in place of stone , but it should be made more durable.
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