Evening bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1895-1912, 1909-03-25

IL miles in length, was opened In June 1906.
with a flow of 20,O00.000 gallons per day.
The ditch Is Is miles long. with daily
capacity Of 70,000000 gallons. This ditch
is also Of the tunnel variety" approx.
mately nine of the twelve miles length Of
the ditch being tunnels eight feet wide and
seven feet high.
The WaiIuku .Waikspu Ditch. The Wal.
luku Sugar Co. and Hawaiian Commercial
& Sugar Co have Jointly constructed ~
mile ditch from Waihee to Waikapu. This
ditch is largely through tunnels. It has a
daily capacity Of 100000 gallons.
Oahu Sugar Company bitches. The Oahu
Sugar Company, although mainly pump.
ing plantation has constructed over fifty
miles of bitches which intercept the storm
water and small regular flow from a mum.
Der of valleys extending back into both the
Koolau and the Waianae mountains.
Storage Reservoirs. Incidental to both
the ditch and pumping stations. Is the sys
TEN Of storage reservoirs for collecting
storm water from the bitches and night
water from the pumps. The first reservoirs
OF any considerable capacity were con.
structed In connection with the Hamakua
and Hawaiian Commercial bitches; but It
is only since annexation that reservoirs
have taken the prominence that they now
occupy in connection with cane irrigation
The island Of Hawaii has practically no
reservoirs for storage purposes. except at
Kohala, but number will be built in con-
nection with the Kohala and Hamakua
bitches Maui early took the lead In this
adjunct Of irrigation, but Oahu and Kauai
have now walked up to the possibilities Of
lnr Ra rail In
crease in the number Of storage reservoirs
is planned on almost every plantation. On
the pumping plantations the reservoirs are
used to store the night and Sunday water.
the pumps working continuously. II is not
good economy to irrigate at night, and only
necessary work is done on Sundays. The
method OF construction Of the great MAORI.
ty of these reservoirs is extremely simple
shallow gulch or swale IL selected and
into or across this. dirt is hauled by carts.
scrapers, or by sluicing. No core is built
This type Of dam is seldom over thirty feet
high there is one at Waialua GO feet high.
and costs from 81 800 to $4,000. Dams of
greater height generally have a concrete
core wall extending down from the original
surface Of the ground for from ten to forty
feet. into bed rock; wooden core wall i'm.
peuueu III tht coHCitte anu tNteHulUB uOWn
from the original surface Of the ground for
from ten to forty feet, into bed rock; a
wooden core wall imbedded In the concrete
and extending to the top Of the dam helps
to hold the water from soaking through the
dam until the earth fill has had time to
settle and harden.
The Wahiawa Dam. The great Wahiawa
dam. furnishing water to the Waialua plan.
tation, on Oahu. Is Of the latter type OF
construction. but Is unique In that II has a
stone backing, on the down stream side OF
the dam, containing 26 900 cubic yards
This dam is 400 feet long, 100 feet high, 400
feet thick at the bottom and creates a
reservoir with capacity Of $500 900 900
gallons, the largest in the islands. The
earth dam OF the largest capacity in the
islands Is at Koloa, Kauai. where a long
dam only eighteen feet high encloses an
old swamp giving a storage of 1900 900 900
gallons.
Number and Capacity Of Storage Reser.
voirs. The following are the number and
capacity OF the storage reservoirs on the
several plantations, so far as statistics have
been obtained.
NJ Ifv In,