The Pacific commercial advertiser. [volume] (Honolulu, Hawaiian Islands) 1885-1921, 1891-05-08

The difficulties Of the conception of the
best position OF the ditch, from an en-
gineering and therefore economical
point OF view, all lie in the 6n,t 90
miles, or from the head dams TO sie last
pipe crossing Of the Hanapepe 5 ream.
In this distance there are 10, 100 leet OF
ditching, II 300 feet OF fuming, $50
feet of steel piping and OH feet Of tun-
neling. There are six inverted syphons
in this distance. The first three are
short, crossing side gulches, the last
three crossing the water from one side of
the main canyon to the other, to pass
precipitous bluffs or to obtain more ia
vorable ground for ditching.
The longest of these syphons is 1928
| feet, and the deepest 400 feet. The
| diameter of the pipe is 40 inches, of
steel of $1,000 pounds tensile strength,
and varying in thickness from q to 5-16
of an inch. The maximum strain is
$4,000 pounds per inch, or al ,ut d the
estimate strength of the pipe. The pipe
was thoroughly coated inside and out
with heated preparation Of asphaltum
and coal tar, laid in trench in the
ground or on prepared trestle work, riv-
eted continuously in sections, and COW
cred with earth or lumber to prevent
the sun from melting the asphaltum or
causing expansion. Pipe similarly pre-
pared and laid in California has been
found to be as good as new after doing
fifteen years service. There is good rea-
son to believe that fifty years is not too
long to expect for the life of such pipe.
Four substantial iron bridges carry the
pipe across the river. Three of them
are of 100 feet each, the other of 140 feet
span. The fume of which there will be
altogether about pa miles, consumed
about 600, 600 feet of lumber, and is very
substantially built OF redwood.
Of the ditching about two miles were
cut from the solid rock, the remainder
being in the ordinary red earth OF the
Islands. Five-sixths of the last 61a
miles, or from the last crossing of the
Hanapepe stream to the natural reser.
voir, was OF this material, and the work
was very cheaply done with plough and
scraper.
The tunneling, of which there was a
little more than 1000 feet, was almost
entirely in the rock. The longest tunnel
was 373 feet
The entire cost of the ditch, from heaC
gates to the point where it leaves Hama
pepe stream and enters upon the land:
of the company was $l52, 0l3, divided al
follows: $3.50 feet of piping, costing ST.,
251. This includes $11 1921 for bridges
piers, etc. IL 800 feet of fiuming, cost
ing $40, 225; 1,017 feet of tunneling, cost
ing 1929; and Is, 500 feet of ditching
costing $28, 1858. This is within the orr
ginal estimate of the cost of the work.
BY careful calculation of the differ
ing grades of ditch, fume and pipe it was
found possible to make use Of an ancien
crater presumably as natural reser
voir for the storage of surplus water
The full depth of the crater is utilized
This natural reservoir is 81 feet deep ant
about 900 feet across at the top. Wher
full, it has capacity of 43 ,000, 900 gal
Ions, or 80 hours run of the ditch. II
. construct a reservoir of this capacity OF
the most favorable ground of the Hawaii
an Sugar Co.'s land would cost man.
thousands of dollars.
) The land lying below the ditch ant
capable of being irrigated by it EN-
braces 1000 acres of very fertile cane
land. With a cheap system of irrigation
combined with the latest improved
machinery, both mill and plantation, thu
future success of the Hawaiian Sugar Co
seems assured.
To Hon. H. P Baldwin, President O
the company, to Mr.. E. M. Walsh, tn,
efficient manager of the plantation, ant
upon whom the burden OF the manage
ment and construction of the ditch ant
other work necessary to the starting of
large plantation has fallen; and to thei
associates of the H. S. Co., too mucl
praise cannot be given.
III. G. PERRY,
Eng'r in charge.
Makaweli, Kauai, April 3Oth, 1891.