679 [=40] (V.2)

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679

of 2 channels of 7 feet wide each
B1 B2 B3 B4 with its head B1 on the
upstream side of the valley passes
under the canal and through
the foundations of the regulating
bridge; the escape of the drain
at B4 is connected with a cut
which carries the water off to
the lower levels at a point alto-
gether free from the deposits of
the torrent. Under the second
head, the letters A1 A2 A3 A4 show
the position and direction of a
masonry drain which forms a
component part of the revetment,
it commences at A1 and is carried
on a rapid slope along the rear
and at the foot of the right
revetment to A2, the drain then
passes under the canal and
through the bridge foundations,
turning to the right it then
proceeds along the left revetment
from A3 to A4 at which latter points
it joins the Rutmoo River. The
detail of construction of these
drains will be enetered into in
its proper place; the general
sketch above given will [shew?]
the advantages that have been
taken of the successful operations
in reducing the level of spring
water.

The whole of the masonry
works at the Rutmoo [River, struck through]
with the exception of a portion
of the inlet, are founded upon
blocks undersunk from the
lowest level to which the spring
water could be reduced. The
maximum depth to which
these

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kishman

Contains struck through text