The Pacific commercial advertiser. [volume] (Honolulu, Hawaiian Islands) 1885-1921, 1903-04-20

square feet, which is ITO be filed level,
as a part of the dam to an elevation
: of 96S. This is to be the elevation of
the washopt, and the outlet viii be
$40. which is an ample allowance for
sediment. In connection with the
reservoir bottom, in order to prevent
the growth of vegetation as far as
possible, it would seem proper to exca-
waite a bench on the whole length of
the contour of elevation of lob. car
ried in level to meet a slope of 2 to
from the elevation of 1,O17, the top
water level, and there would thereby
.be no place inside of the reservoir less
than four feet below high water mark
This would necessitate an additional
excavation of $4,000 cubic yards. but of
course, the part where the haul is not
too long could be put into the dam.
A short masonry dam. nine feet high.
and fourteen feet wide, will have to be
built at the Lulumahu water head, and
be provided with gate. connecting
with ditch, of dimensions of rs feet
on bottom and three feet deep, and
some 1900 feet long, leading into the
reservoir The location of this water
head is made so as to bring the ditch
some ten feet in elevation above the
reservoir, and it is intended to enter
the reservoir a considerable distance
above and away from the dam. Lulu
mahu stream. during the past month.
has averaged about 09 cubic feet per
second, or about 4O5 gallons per min
ute; and, included with the Nuuanu
stream, there would be an average of
81 cubic feet per second, or 1896 gall
Ions per minute.
The stone pitching for the inside
slope of the embankment should be at
least one foot thick. The practice here
has been to be content with six inches.
but it is too little
The present Nuuanu road will have
to be relocated. higher and to the left
of its present position, for distance
of some 1,4O0 feet, where it is within
the limits of the reservoir. (This has
been partly done already.)
The MAIN FIGURES.
Herewith are appended the main fig
ures in connection with the reservoir:
Capacity, including additional area
added by excavation. S41, 00O, 900 gallons,
U. s.
Elevation above sea level of top of
dam, 1,020 feet.
Elevation of overflow, 1,017 feet
Average head over electric light |
wheel. $50 feet.
Length or dam, 1,23S feet.
Length of reservoir, S.1Oo feet.
Greatest width, 1000 feet.
Area to be cleared of vegetation, Ssh |
acres.
Area of reservoir to top water level. |
SO acres.
Area in dam bottom, 15S.o4o square
feet.
Area in creek bed portion of dam
bottom. 1880 square feet
Area inside of the reservoir to eleva-
ton of 96S to be filed as part of the
dam. 1920 square feet
Fill in dam in cubic yards, 81, 500.
Equivalent mean section of dam |
would be an average fill of 26.3 feet
Greatest fill in dam, SO feet.
Superficial area of upper slope CT
dam, to be pitched with stone one foot
thick. So. APO square feet
Cubic feet of concrete in cut-on wall,
pipe collars and foundation of gate
well, LOO.
Bubble masonry dam at Lulumahu.
200 cubic feet
Cubic feet of brick work in pipe well.
$50
ESTIMATE OF COST.
"a detailed estimate is given, max
Ing the cost of the reservoir, exclusive
IF pipe. $75,Oo0)
Respectfully submitted.
W. w. BRUNER, c. E