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.

Q: In the construction of a levee by compacting soil excavated from a borrow area to dry density of…

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Q: A flownet of a coffer dam foundation has 6 flow channels and 18 equipotential drops. The head of…

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Q: The figure below shows two flow lines for seepage across an interface between two soil media of…

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Q: xfiltration trench is to retain the latory water-quality depth is 2.5 fer is 10 m/d and the trench…

A: Given:- 0.5 ha catchment  water quality depth =2.5cm wide=1m deep=1.5m porosity=0.4 To find:-…

Q: c) An embankment (total volume = 115200 m³) is to be constructed from borrow material found at a…

A: Ve = 115200 m3 mc = 11% or 0.11kN/m3Relative Compaction = 95%

Q: 2. Water is to be transported in a clay tile lined trapezoidal channel at a rate of 0.6 m3/s. The…

A: The given data is as follows: Flow rate=0.6 m3/secBottom slope of trapezopidal channel=0.0015

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.