603 [=628] (V.1)

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603

their protracted lines of levels to
the Directors Office for approval
with their own projects for the
slopes of the bed marked upon
them.
6 "The dimensions of the main
Rajbuha and feeder channels
will be as follows; those which
are given to be considered as
minimum ones.

Diag : LXII. 603

Section on C D, or at the Heads
of Rajbuhas and Feeders

3' 3'
5'
3' 3'
6'

Section on E F, or at the tails of Feeders
on their entrance into Rajbuha

3' 3'
5'
2' 2'
3'

Section on A B, or on main line
below 1st masonry descent

3' 3'
5'
3' 3'
4'

"Slopes of excavation equal to
depth; slopes of banks 1 1/2 to 1.
"These lines should be carried
out at right angles to the main
canal * for a distance of a furlong
at least, and in laying out the
levels, and in fixing the pins for
excavation I would recommend,
furlong distances or even portions
of miles, each portion being exca-
vated in one horizontal level,
commencing
_______________________________________
* In cases where Rajbuha heads are situated
at bridges, and where the masonry channel
lies obliquely to the line of embankment,
the Rajbuha excavation will be carried on
in prolongation of the bearing at which
the axis of the masonry channel is situated

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