The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1890-11-25

{ pS SSlectSQ on the coral HATS east
Of the harbor channel, and this is
TO be surrounded by suitable re-
tanning wall and levee; on its en-
posed sides wall similar 10 those
built round hshponds, and on the
sides not exposed TO the action of
the waves Mr.. Allardt considers q
suitable embankment would be
sufficient. If the site at present
proposed be selected, about $500
feet of pipe will be required TO
carry the material from the dredge
TO the place of deposit
The "modus operandi is thus
described in Mr.. Allardt's report TO
the Minister of Interior, dated July
10Th last; 8 The work is to be done
by what may be termed the by
draule method, that is, by pump
ing up the material in suspension,
and Transporting it by water car
riage through sheet-iron pipes TO
its destined place of deposit, where
it may be allowed 10 settle. The
machine proposed to be used is the
Won Schmidt Patent Dredge, and
consists Of 3 powerful steam engine
snd centrifugal pump mounted
upon s large seow. From
the bow Of the seow is sGs-
pended s heavy boom with movable
joint. having ~ its outer end q
rotary plow armed with s number
Of steel shares or cutters fastened
to its periphery. When dredging
is going on, the boom is lowered to
the bottom, and the plow is made to
revolve with considerable velocity,
in that way loosening the material
| TO be dredged. The material to-
I gether with large percentage of
water Is then sucked up through the
suction pipe by means of the GEN.
trifugal pump, then forced by the
same power through the transport
ing pipe TO It's final place of de-
post, there it is enclosed by the
Ieyee or wall for holding back the
debris laden water until it has time
to settle, and then the clear water
runs back to the bay by one or
more openings left in the levee.
in this way large tracts of
lowIand Oh the shores Of San Fran
cisco Bay were efeetualIy re-
claimed p
The totaI cost Of removing the
bar by this system is placed by
Mr.. AIardt st s9S. 600 or if it be
found advisable to carry part or
the whole Of the material to I more
distant spot-a proportionate in
crease Of cost for extra piping, etc,
or as Mr.. AIIardt points out, having
the scow and dredge st their dis
posal, the Government having
cleared away the bar can turn
round and deepen the entire harbor
to s uniform depth Of thirty feet
at low water, by the expenditure,
IN sill, of something under 5000, GOO,
and st the same time have aD eff
Gent dredging plant on hand for
future work such IS widening the
channel on the bar If necessary.
The present estimates are for $
straight channel 200 feet in width
and keeping the harbor free from
the debris annually discharged into
It from the surrounding hills.
This vast improvement then may
actually be accomplished within
the next half year. The LegisIa-
ture have done their part IN voting
the money 100000 and the Min
ister Of Interior seems ready and
anxious TO do his part
The works already done by Mr.
AIIzrdt for the Railway AID Land
Company and the great fame for
the MakaweIi Plantation prove
him 70 be IN euinentIy safe and
successful engineer. his calculations
showing great foresight, and Z
keen appreciation and provision
for the circumstances prices and
inuumeFabIe considerations 10 be
reckoned with by Al engineer,