EMBANKMENT AS RIVER TRAINING WORK
The
embankments, discussed earlier, are fragile works indicating an inherent
weakness of this method of river training and control. Their merits and
demerits as river training work are as under:
Advantages: (i) Only means of preventing
inundation on tidal plains, (ii) Low initial cost, subsequent raising
may be possible, (iii) Easy construction, making use of locally available
material and unskilled labour, (iv) Maintenance simple and economical, (v) Can
be executed in parts, provided that the ends are properly protected.
Disadvantages: (i) Cause raising of high flood
levels, (ii) Possible to boring by crabs and worms resulting in failure
by piping, (iii) Need close supervision during floods, (iv) In the event of a
breach, there is a sudden and considerable inflow of water which may cause
damage and deposition of sediments rendering the area unproductive, (v)
Susceptible to direct attack of river flow which can erode or undermine them,
(vi) Low lying areas may become infected with malaria, if proper drainage
facilities are not provided, (vii) In rivers carrying a considerable sediment
charge, embankments exclude silt deposition on the flood plain, extension of
the delta towards the sea is thus hastened, resulting in the increase of flood
stages and the rate of aggradations of river bed.
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