Question

An impermeable layer is provided at the bed and sides of canal to improve the life and discharge capacity of canal known as ______________

(a) canal modification

(b) canal concreting

(c) canal lining

(d) canal regulation

I have been asked this question in exam.

I'd like to ask this question from Reports on Estimate for the Construction of Road and Irrigation Channel topic in portion Valuation, Reports Technical and Design Data of Civil Engineering Drawing

Answer 1

Correct option is (c) canal lining

For explanation I would say: An important reason for lining a canal can be the reduction in water losses, as water losses in unlined irrigation canals can be high. Canals that carry from 30 to 150 liters/sec can lose 10 to 15% of this flow by seepage and water consumption by weeds. Lining a canal will not completely eliminate these losses, but roughly 60 to 80% of the water that is lost in unlined irrigation canals can be saved by a hard-surface lining. 42 Canal lining Minimizing water losses is very important, and especially so in schemes where irrigation water is pumped. Reduced water losses means less water to pump and thus a reduction in pumping costs.