A trapezoidal channel having side slope (1:1) it is required to discharge 1.478 m3/sec of water per each square meter of channel area, bed slope (1 to 1000). If this channel is unlined and the value of C=44 and when this channel is lined with concrete the value C=60. The cost per cubic meter of excavation is four times the cost per square meter of lining. The channel is to be the most efficient one find whether the lined channel or the unlined channel will be cheaper what will be the dimensions of the economical channel

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Pricing Excavation and Backfill

Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.