An unlined channel in alluvial soil has a seepage loss of 3 cumec/million sq.m of wetted perimeter. The channel has a wetted perimeter of 30 m and has a maintenance cost of Rs.1.25 per sq.m of wetted perimeter. There is a huge scarcity of water in the area and as such the canal is to be lined with cement concrete lining 15 mm thick so as to reduce seepage loss to 0.04 cumec/million sq. m of wetted perimeter. The lined channel will have a wetted perimeter of 25 m. The extra cost of lining works out to be Rs.120/- per sqm. If the average annual revenue per cumec of water is Rs.30 lakhs and percentage reduction in annual maintenance cost is 40%, then state whether it is economically feasible to provide canal lining. Assume the life of canal lining as 50 years and interest rate is 6% per annum.

An unlined channel in alluvial soil has a seepage loss of 3 cumec/million sq.m of wetted perimeter. The channel has a wetted perimeter of 30 m and has a maintenance cost of Rs.1.25 per sq.m of wetted perimeter. There is a huge scarcity of water in the area and as such the canal is to be lined with cement concrete lining 15 mm thick so as to reduce seepage loss to 0.04 cumec/million sq. m of wetted perimeter. The lined channel will have a wetted perimeter of 25 m. The extra cost of lining works out to be Rs.120/- per sqm. If the average annual revenue per cumec of water is Rs.30 lakhs and percentage reduction in annual maintenance cost is 40%, then state whether it is economically feasible to provide canal lining. Assume the life of canal lining as 50 years and interest rate is 6% per annum.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

An unlined channel in alluvial soil has a seepage loss of 3 cumec/million sq.m of wetted
perimeter. The channel has a wetted perimeter of 30 m and has a maintenance cost of
Rs.1.25 per sq.m of wetted perimeter. There is a huge scarcity of water in the area and as
such the canal is to be lined with cement concrete lining 15 mm thick so as to reduce
seepage loss to 0.04 cumec/million sq. m of wetted perimeter. The lined channel will
have a wetted perimeter of 25 m. The extra cost of lining works out to be Rs.120/- per
sqm. If the average annual revenue per cumec of water is Rs.30 lakhs and percentage
reduction in annual maintenance cost is 40%, then state whether it is economically feasible
to provide canal lining. Assume the life of canal lining as 50 years and interest rate is 6%
per annum.

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