373
*
that its floor will be at a level of 12 inches below that of the former - Along the floor of the Subway
will be laid the 18 inch delivery pope
which forms the continuation of the vertical Sluice main. The
terminate.
er
the
Drawing
masonry of the Culvert will
lasın shown in No 5. and the water will be passed over a
gauge Gun metal war
weer with a knife edge and graduated sides for the purposes of measuring the Volume: passed into the tunnel the inlet mouth of which is also in the
men.
the
gange
basin.
28. The lye wash. The bye wash of the
reservoir has already been formed by nature
shape of a small and narrow running parallel to the Fytam gorge as
shown in Drawing
N1. The bottom.
w valley
of
this
Valley is about seven feet below the top of the proposed masonry dam and its
average width is about 150 feet or more than four times the actual width required for the overflow during the severest preskets - As this width actually exists and notwithstanding that- it is so
greatly
in excess of actual, require ments it is not intended to incur the
may
and
expense of contacting it in,
any way, the bye wash works therefore be limited to the formation of a Granite ashlar overflow- weir across the small valley flanked by two solidly beult lateral divarf walls to confine the overflow within bounds.
As the trial excavations already made on the spot have revealed the presence of rock
along the entire floor of the byerwick it will not be necessary to pave the latter. The minor
12.