The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1915-11-16
MAO[E DITCH may.
YIELD BIG FLOW Of
EXCELLENT WATER
Engineer Taylor Submits Inter.
esting Statistics To Municipal
Water Commission -
n, "a. 81, .. . . '' tf'5n' aaRsa
s-s-s-- .
ESTIMATE OF CITY =
ENGINEER CUT $4,000
Report Is Adopted Unanimously
BY Members Present At
Yesterdays Meeting.


Honolulu water investigating commits
sion, made preliminary report to the
commission at a meeting held yesterday.
morning. According to Taylor s report
500 100000 gallons Of water a year can
be secured and diverted into Nuuanu
reservoir No. 4. 81 ~
The report deals with the available
water supply from Maole stream, Hill
lebrand glen, and outlines how the guam
tity of water mentioned can be secured
by the construction of conduit at q
total cost Of $24,955. ,, So. g.. .,
Taylor states in his report that the
quantity named is approximately 25 per
cent less than the plan of tunnel and
pipe lines proposed by the city engineer
at a cost of $33 800. The location Of
Hillebrand glen is in upper Nuuanu
valley.
Manoa Valley TO Be Surveyed
After the report had been read and
adopted, John Wilson, q member of the,
commission, moved and the motion was
unanimously carried, that the engineer
take his field party and begin work, at
once in Manoa valley on q preliminary
survey to ascertain the feasibility of
diverting the ,headwaters of this valley
across Nuuanu valley and into .Reser
voir No. 4. .,. ..- #
Charles R. Forbes, presiding chair
man, appointed Jorgen Jorgensen, Jas.
Taylor and T. F. Sedwick a special
committee to investigate the question
of seepage in No. 2 reservoir. It Is be
lieved that this Investigation win be
completed within a month. Another
duty of the commission will be to take
up with Land Commissioner J. d. Tuck
er the matter of placing the proposed
conduit and tunnel on CO. eminent land,
The report of Engineer Taylor is a.
follows,
Engineers Taylor's, Report
~ beg leave to make the following
preliminary report on the feasibility,
the method and the cost of divertine
and conveying the available water
supply from the Ma0le, stream in Hi
lebfand glen to Nuuanu reservoir and
g." No. in the upper Nuuanu valley
Oahu.
~ have made n careful preliminary
survey of contour grade line with q
fail OF 1885 feet per mile from MaOle
stream below the lower falls to Nuu,
anu dam and reservoir No. 4, to de
liver the waters into the reservoir Just
mauka of the dam on the Eva side "a
the Nuuanu valley at an elevation Of
1928 feet above sea level, which is the
elevation of the top of the main spill
way leading from the reservoir on the
Waikiki side of the Nuuanu valley into
the buamaha gulch.
1.-The accompanying contour map on
scale of 200 feet to one inch shows
the preliminary line of ditch with con
tours at fve-fOot intervals.
''The final location Of the proposed
ditch will follow with easy curves near
the present angular line, except the tun
mel which will be on a direct line from
the upper end Of the ditch to the di
version ut the Maole stream in Hille
brand glen.
Watershed Is Described
1.-The entire watershed of the pro
POSED ditch is within the boundaries of
the government forest reserve.
"The approximate areas are as fol
lows:
IIillebrand glen, 1875 acres.
Nuuanu valley, l75 acres.
Making a total Of 800 acres.
This water shed extends from an ele
walton of 1890 to 26OO feet and about
80 per cent or $50 acres, are heavily
wooded on steep slopes.
1.-THE general conditions and topogra-
rhic features of this water shed are fav
Orable for runof. No.,
''The average annual rainfall from
the rainfall records of the Nuuanu val
Icy water shed from Luakaha mauka is
approximately l37 inches, based on the
records of rainfall at Luakaha, the Nuu
anu dam and the Nuuanu pail.
While runOff bears direct relation
to rainfall, yet the amount of runOff
is affected by many varying climatic
and Topographic conditions, such as the
depth of soil, the vegetation, the total
rainfall, its rate of rail-, as we'll as tho
temperature of the air and earth.
Run-of Invariably Varies
Tho runoff of a given water shed
varies also, due to slopes, the percent
age increasing with the rainfall. o.,
From the area and character Of the
water shed tributary at Hillebrand glen
and the water shed of that portion of
the Nuuanu valley under consideration
estimate the average mnOf to be as
follows; One, third at 40 per cent, one
third at 80 per cent and one third at
% per cent, making a general average
over the entire water shed of so per
cent.
From the records of the U. s. Geo
logical Survey compiled from the data
obtained by l.. A. Moore, observer,
find the following as very good ex
ample of the ruROf from heavy rain
fall in the Nuuanu valley:
"In the month of September, 1914,
the runOff in the Nuuanu stream meas
ured at the government weir below
reservoir No, 2 wasteway, shows to
tai of 5l2,70 million gallons, with a
maximum of SO millions, a minimum of
4.27 millions and a monthly average Of
III millions. s..
Slopes And Rainfall Studied