EN797 [=158] (V.2)
Facsimile
Transcription
797
the height of the superstructure
and to adapt it to the section
of the excavated channel. I
would in no case reduce the
waterways of the bridges below
50 feet in width, as independently
of the escape water from the canal
the channel will hardly pass
through so long a tract without
receiving in its course a con-
-siderable quantity of country
drainage.
The design upon which
Mahomed Aboo's Channel has
been excavated, is the same as
that practised at Khutowli.
The leading mile has been exca-
-vated on a slope of 15 foot per
mile, from which point it is
carried on, on one uniform level;
nature being allowed to work
her own progress in retrogression
of wear, and the engineer having
to mee the retrogression by the
establishmdent of permament
works. Here, as at Khutowli, the
leading bridge with its fall is
attached to the Main Rajbuha
which is at the time that I am
now writing, in the course of
[progress, struck through] construction. The natural wear [upon, struck through]
upon the bed, therefore, will take
place between the West Kalli
Nuddi and the down stream
side of this bridge, precisely as
is the case at Khutowli; in that
instance, however, 2 intermediate
falls have to be constructed, in
the present there is only one.
The capacity of channel
as excavated is reduced to the
most economical limits, being
in rectangle 60 feet in width on
the 1st, 40 on the 2nd, and 20 feet
in
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