22
370
This modification will avoid the great difficulty that would have attended the sinking of a verhoal well shaft 100 feet deep in the hillside and it will incur no risk of detracting from the stability of the dam as due care has been taken in the design to shongthen the shucture around the valvewell by a projection of the
the Drawing Nitt
masonry as shown The outlet works will consist of (1) an ashlar masonry valve well divided into two compartments, wet and dry respectively, by the cast iron partition
medfeather to which are fixed the outlet valves
and
gearing (ll) a submerged
or inlet culvert built under the
dam from the reservoir into the valve well. Ma dry outway culvert to hold the 18 inch
or
main delivery pipe that leads out from the day compartment of the valvewell to the
M
gauge.
bason outside
23 The Valve well. The valve well will be 5 feet
by 12 feet rectangular
shape and will be built of granite ashlars set in thick beds of 2 to 1 Coment mortar. The foundations for the well must be carried down to the soled rock and must be dealt with in the same prescribed for the seat of the dam
manner
as
itself -t Chase or
the
masonry
groove will be cut down two sides of the will
to receive the jaws of the cast iron mid feather plates which should fit into the
grooves sufficiently tightly to enable the plaks to slide down into
into place. The space between the jaws of
the
grove
will then be filled
in order to make
Iron F
& granit.
of the
pilates with liquid cement
watertight joint between