The Hawaiian gazette., 1908-04-24
GOOD PROGRESS
At THE DAM
Continued from Page one.)

|, Continued from Page One.)
! larry dried up each droughty season.
James T. Taylor is the engineer &c
whom the department looks for the es-
adjustment of levels and grades anG
the one who figures up the amount OF
work performed for the monthly re-
ports: Inspector Robinson oversees the
work as it progresses and Inspector
; Scott. working under the authority OF
! the Board of Health. looks after the
sanitary condition OF the laborers
lcamp and the sanitary conditions about
the work generally. This is Superintend-
ent of Public Works Campbells STAFF
on the job. while 10 him personally
come all the engineering questions that
lreQuire settlement and from him comes
the final word in all matters, for upon
him rests the responsibility of it all.
In case of failure the blame goes TO
the superintendent and in case OF sue
cess the contractor takes it.
Superintendent Campbell yesterday
lTiSited the dam in company with the
representatives of the Honolulu press.
the party going over the work and
having it explained in detail for the
press men.
] ROCK FILL WORK.
! The energies of the one hundred and
I twenty men at work at present are
l directed towards two main purposes.
! one to heap up the great stone I'LL on
the makai side of the dam across the
main guIch, the other to lay the
fumes. install the four pumps and get
ready for the sluicing for the mauka
side. The rock fill is progressing favor
ably. about two hundred yards of rock
/ daily being dumped into the gulch
/ from the two Quarries operated, one
/ the old Lunamahu quarry on the Wal
kiki side of Nuuanu and the other a
new quarry just opened up, where a
superior grade of stone has been found.
| This better stone is being used alto
gether for the hand placed face of the
| fill. Within twenty days it is expected
that all the rock will be in position. by
which time the preparations for sluic-
| ing will be almost completed.
TEMPORARY RESERVOIR.
All the sluicing is to be done from
/ the Waikiki slope of the basin. The
water for the work will be taken from
I the bottom of the gulch, where a fair
sized reservoir has already been form
/ ed and from which water is being
drawn daily for the supplying of the
/ city mains and nightly to be turned
! into electrical power at the power
house. At present this reservoir is
/ shallow. but at times of heavy rains
such as came ten days ago, it swells
/ into a big lake. On that particular
occasion, when five inches of rain
drained of the immense catch basin
I into the gulCh bottom, the water rose
nine feet and poured over the top of
I the spillway before the storm tunnel
although the emergency and main
pipes in the valve tower were opened
I to their widest extent. This storm did
absolutely no damage however. and
a very much bigger storm would do no
more. even If it should fill the reser-
vOir so as 10 overtOp the partial fill,
I the center of the cOrewau having been
Z left open as a safety valve in the event
Of the pipes and tunnels not being able
to handle the flow, very remote con-
tingency.
HYDRAULIC SLUICING.
From this reservoir. which will be
filed to a capacity of thirty-fve mil
lion gallons, two centrifugal pumps
viii lift each five cubic feet of water
a second one hundred and fifty feet
up the hill, TO where the flow will be
taken up by two other pumps and
forced into pipes leading along the hill
on practically a level to the sluicing
grounds. Here, with. the full pressure
Of the pumps behind it, the water will
be forced through a four inch hydrau-
lie nozzle and the hillside will be lick
ed into mud by the force Of the stream
and swept into iron fumes to build
up the dam That stream, as it
energies from the nozzle. will have a
force of forty-five pounds TO the inch
and with that a boulder, the size OF a
washtub can be picked up and ffOated
of. The most powerful axeman could
not drive an axe head through such
a stream If he tried il II would jerk
the axe from his hands, throw it nifty
feet and probably send the man him
self spinning. The pump sellers
thought that pumps to lift three cubic
feet a second would give ample force,
but the contractor added a big factor
OF safety and ordered pumps with
nearly twice that capacity. These
pumps viii be at work and the side
hill VIII be moving down into the gulch
for the big fill within thirty days The
contractor had ninety DAYS in which
to install them, lay three thousand feet
OF iume on airy trestles. and begin
sluicing- Yesterday Superintendent
Campbell stated that he would be well
within the time limit.
The trestles on which the fumes viii
be carried are being built on three
story principle in order that the fumes
may be raised up as the level Of the
dam rises The fumes themselves are
OF heavy eighth-inch iron. it having
been found that the wooden fumes