790 [=151] (V.2)

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Transcription

Status: Complete

790

the excavations on an uniform
slope of 1 1/2 foot per mile, until
the bed level [struck?] upon the
slope of ther valley; the above
slope was given to the leading
mile of its course only, or up to
a point where the channel is
crossed by the main Right Raj-
-buha to which a brodge of cross
communication is attached; from
this point the excavation was
carried on a dead level, by which
1 1/2 foor in depth per mile was saved.
The bridge attached to the Rajbu-
-ha has at its downstream side
an overfall of 8 feet in perpendicu-
-lar depth, constructed in the usual
form, protected by flank and tail
defences, and in every way ready
to meet the action of retrogression.
It will be understood that by
the above arrangements, out of
the total fall of 29.21 feet from
the canal bed to that of the
river, ^we only dispose of 1 foot, the
amount of tail fall to the es-
-cape head, 1 1/2 foot to the slope
for one mile of escape, and 8
feet for the masonry descent, or
a total of 10 1/2 feet: the remaining
slope having to be regulated
by an amount of masonry
descent equal to 15 feet, the
balance being disposed of in
the slope of the earthen chan-
-nel. With the profile of the
country before us, and knowing
the slopes upon which it is our
intention to regulate the bed
of the escape channel, it is
obvious tha the engineer can
determine the precise position
in which, when the current has
made its own excavations, the
additional

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