403
Light..
The water stopped by the Dam, will be carried off by a channel cut-in the side of the hill and led away below the site for the Embankment.
The channel to measure Ten feet in width and five feet in depth, bottom paved with one-foot-rough stone closely packed and grouted. The sides built-up with rough stone Two feet-thick in mortar and the whole water surface rendered with good chunam.
The temporary dam to be removed and means taken to close the channel at the conclusion of the Embankment work's or when required.
The Embankment:
The position for the embankment having been decided on, a trench to be excavated, measuring Forty two feet at the Surface, except where rock is met with, and fifteen feet at fourteen feet-depth, the sides being stepped as shown in section.
Below this depth the trench to be carried down to solid rock or impervious strata, sides sloping 4 or thereabouts. On excavating should solid rock be met with, it will not be necessary to penetrate through it.
Water percolating through the sides of the Trench must be got rid of by pumping, and necessary drains must be provided to carry it off from the best, so that no water may remain in the trench when the Puddle is put in.
The trench having been satisfactorily completed, puddle approved of mud from the bed of the Canton River, worked with water to a proper consistency, will be put into the trench and rammed in six inch layers. On reaching and middle part of the trench, the sides of the puddle to be sloped up, so that the puddle may measure 18 feet-thickness at the surface of ground, and the sides shall to be protected by concrete composed of 3 Granite Chippings, 2 pure lime, 1 Granite.
The chippings to be broken up small enough to pass through a two inch ring, and the whole to be well mixed and incorporated, put into the trench and rammed in layers not exceeding six inches thickness. On arriving at the surface of the ground the concrete will be spread out on either side to cover the entire site of the bank, to measure three feet-thickness, laid and rammed in layers not exceeding 6 inches.
A trench will also be sunk at the toe of the Embankment - Measuring from 8 to 15 feet depth according to the nature of the ground and Ten feet wide at the bottom, stepped at the upper part as shown in the section. This trench to be filled with concrete poured in and rammed as described above.
The outer face of the bank to be also protected with concrete, as shown in the section, carried up to such a height as to be above level of water in Gauge Basin.
The centre of bank to be formed of puddle as described above, sides sloping from the eighteen feet base to eight feet thickness at the top of Bank.
Extra thickness to be made at the foot of the Embankment.
403
light..
The water stopped by the Dam, will be
off by
a channel cut-in the side of
Carried
the hill and led
Embankment --
away
below the site for.
The channel to measure Ton feet in width and five feet in depth, bottom paved with
one
-foot- rough stone closely packed and grouted The vides built-
up
with rough plone Two feet- thick in mortar and the whole water surface. rendered with good chunam.
The temporary dam to be pemoved and means taken to close the channel at the conclusion the Embankment worth's or when required
The Embantment:
The position for the em
off
bankment having been decided on), i trench to be excavated, measuring Forty two feet at the Surface, except where pock is met with, and fifteen feet at fourteen feet-depth, the gider being stepped as shown in section.
Below this defoth the trench to be carried down to
Solid puck or impervious strata, sides sloping 4 or thereabouts, on excavating thould golid pock be met with it will not be necessary to pendiate through it, water fourcolating through the gider
of "Trench must be got rid of by youmping, and
necessary
drains must be forovided to carry it off from the best, to that no water may remain in the trench when the Puddle, is pout in.
The trench having been patisfactorily com- Joleted, youddle Comproved of mund from the bed of the Canton River, worked with rater to a
A
the
cipper
proper consistency, will be your into the trench and Tammed in six inch layers on peaching and rride part of the trench, the pides of the jouddle to be gloped up,
that the oncos may meas
may measure 18 feer-thickness at the purface of ground, and the Dides sholes to be protected by concrete compoused of 3 Granite Chippings, 2 pure lime, Dilecompone Granite
The chippings to be broken up small enough to pars through a two inch ping, and the whole to be grell mixed and incorporated, your into the trench and rammed in layers not exceeding six inches thickness, On arriving at the surface of the ground the concrete will be spread out on either side to aus to cover the entire site of the bank, to measure
three feet-thickness, laid and pammed in layers not excuding 6e inctres -
A pench will also be punk at the too of the Embankment - Measuring from 8 to 15 feet depth
of
&
the
According to the nature
ground and Ton feet bride at the bottom stepped at the
upper part
shown in the section This trench to be filled with concrete pour- in and
RA
& pammed as described above. The outer we of the bank to be also pourtected with concrete, as shown in the section
Carried up to such a height. "rrater in Gauge Barin-
as to be above lovel
The centre of bank to be formed of puddle is described above, sides Hoping from the lighteen feet base to eight feet thickness at the lop of Bank-
Extra thickness to be made at the foot-a
on
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