606 [=631] (V.1)

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606

14 "The width of aqueduct chan-
nels is always to be 12 inches
greater, than the Nulla of the
excavation at the point where it
is built.
15 "When a line of Rajbuha 606
or feeder has to cross a hollow or
low tract of land, great care must
be taken in making the wings of
the masonry channels for the
passage of the canal water suf-
ficiently long, so that they may
be well imbedded in the embank-
ment, and that they may rest
well in soil.
Thus
Diag : LXIV.

Elevation

Top of Bank
Slope and berm
RAJBUHA
PLAN Slope and Berm
Top of Bank. .

A B B A

"It is not easy to fix the
dimensions or distance from
A to B : but the Engineer employed
on the work must be guided by
his own judgment. I may men-
tion that in every case where the
above rule has not been attended
to; disappointment has taken
place, in either the water es-
caping, at the point of junction
between the earth and masonry,
and in such cases by a failure
in the masonry; or in great after
trouble

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