CO129-204 - Acting Governor Marsh - 1882 [11-12] — Page 375

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