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6.13
Likewise, in all the embankments along medium rivers the revetment is proposed to be done by 20
cm thick dry brick pitching to be laid over 10 cm thick jhama khoa filter.
In all the above cases, the revetment will be taken 1.50 m to 2.00 m below ground level with
provision of brick sausage toe wall of size 0.60 m x 0.60 m at the end,
(b)
For Embankments facing Bay of Bengal
In this case, the revetment is proposed to be made by laying cast-in-situ cement concrete (1:2:4)
block, each of size (2.0 m x 1.0 m x 0.30 m) over 15 cm thick jhama khoa filter.
The above cement concrete block pitching in R.S. slope will be extended to 2.0 m below ground level
with a provision of brick sausage toe wall of size 0.60 m x 0.60 m at the end.
Above provision has been made as per recommendation of the Technical Committee of Flood
Control Board, West Bengal.
Cross Walls on Slope
Cross walls made of brickwork of width 0.25 m will be provided across the R.S. slope revetment @
15.0 m C/C for making compartments of revetment which will facilitate quick and smooth
maintenance to the pitching work in future. Moreover, it will increase the stability of the revetment as
a whole.
Crest Top Wall
Crest top wall made of brickwork of width 0.25 m will be provided along the riverside face of the crest
edge to protect the earthen crest from the fury of major river wave.
The crest top wall of embankment facing Bay of Bengal will be made by 0.60 m wide brickwork with
corbelling.
Typical cross sections of different embankment sections as proposed by the Irrigation and
Waterways Department are provided in Figure 6-2 to 6-10.