until they approach the ter-
minal regions, at which the
sills of the Rajbuha heads and
the bed of the canal are on
one level.
5th All these Rajbuha heads
are designed as mere open
channels, with grooves in
front and rear for the appli-
cation of shutters or sleeper
planks. No further design
has been attempted for the regu- 591
lation of discharge beyond
that of the grooves for the ap-
plication of the above mentioned
wood work, and the supply
of planks sufficient for the
purpose of retaining the
water in the opening of the
canal.
6th The Rajbuha channels
are divided into main lines
and feeders. The first or main
lines run parallel to the
canal on both its right and
left sides, extending from the
Assoffnuggur falls, or from
the commencement of the
high land of the country on
the whole length of the canal
and its branches : these
parallel lines on their
passage downwards are
met by feeders from the
different Rajbuha heads
in the neighborhood, as
shewn in the following
Diagram :-
Diagram
EN