The Hawaiian gazette. [volume] (Honolulu [Oahu, Hawaii]) 1865-1918, 1915-11-16

f'From as careful study of the wa.
ter shed, the rainfall and the runoff,
as the time and data at hand would
permit, I estimate the water shed TO
be 400 acres; the average annual rain
fall at 1872 inches and the runoff az 50
per cent Of the rainfall
From an average rainfall of 1872 inch
es, or IL feet, over the water shed
in question of 300 acres, the runoff
calculated at an average of 50rpert centy
would yield approximately $50 million
gallons per year, which Is equivalent to
continuous flow of Las million gallons
daily. T.. III
"A six (6) inch rainfall in "a honrs
ON water shed Of 900 acres under
average conditions with so per cent
runeff, should yield approximately 24tS
million gallons, and a, rainfall of eight
inches under similar conditions would
yield approximately 80 million gallons.
T'As there are records of rainfall in
excess of eight inches, IL would seem
wise to provide for a maximum flow
Of at least 80 to 40 millions. o.. -.
Capacity Of Conduct "
F"The conduit should be 80 designed
and constructed as to have a maximum
carrying capacity for the largest runotf
from the. heaviest rainfall. ~
"The bottom and sides of the ditch
should be cemented (to sufficient
height to carry the normal fowl, or
low stages Of runbff and delivering the
same TO the reservoir without loss, ex-
eept that due to evaporation in the
open ditch.
SThe various inlets from the natural
drainage should also be protected by
concrete work to prevent washing in
times of heavy rains or freshets.
"The final location of the proposed
conduit should be made with complete
plans, specifications and estimates of
cost for the construction of the pro.
posed conduit on the general lines Civ.
en- in this preliminary report.
| "There is no doubt that the project
is not only feasible and desirable but
will prove to be a profitable invest.
! ment.
"The tunnel will be Approximately
600 feet in length and the estimate Of
cost including the lining of the bottom
| and a portion of the sides. 49,. at!v
This tunnel will shorten the total
! length Of the conduit by 700 feet. a..
! This estimate, based upon the pre-.
| liminary survey of the proposed con
duit viii probably be reduced upon a
| careful location and estimate of guam
titles, cement work, etc.
Preliminary Estimate Of Cost
Clearing right of way....$ 400
excavation, 300 1T. ditch at
| 800, ................... 500
Tunnel 900 feet, at $500. $500. 1890
| Camnnt lining G1OO fant at
I %'9o ":............:.. 5000
Diverting dam at Maole
stream Observation-Disclosures l'2oO
Total ..... &91 700
| Rnyineeripo sunerintandonco wv
and cont}ngencies I5Cg $9o55
go
Grand Total s94 o55
UTbis estimate IL onnrnximotoI,I OK
ner cent less thor tho nlon ~ tHnneI
and pipe lines AZ proposed bv the citv
engineer at a cost of $33 500
+ HTbS aHcb GasT+ha 800 nm
" conveying MI the 6ood waters 80
wen as the normal Aov without Ioss
by seepaUe, II aIso drains annroyi.
mateIv o9e,tbird moro wotarshd onI
Az the ditch ia tn he IireI nth nom a
il win he Of more nermanent na'
tnro 0'' POI "'"""' IL"
tSirbo vo,ro 30 200 ,o;,o. o,o
watar 6eI;verod 90 On aIauntie e 20 Io"o
cat ohova COO Ievai into tLn N ~ ,"-o
,eservo;r IL cortoiriv wor.h VI" ~ " Tann,
SSo0o nor ann,,n For " 49, u" u '.'.;s
and irrioatina mnrnosos r'"''' Oo"'''''
TIM totot co. 90 r. oronoao, oa
Uni. is Ioi VS. t tot oHS P'Vi,ost'! 'Hn
.;s tho At oost 20 r. ~" t" ' la
ha roo,;1oa IN a. -, no oo4 .i " s,
tho Sata % -. &C., SoaiS ''"'' i'o"'
Wv 80, Va l.S ooi'P'o''o"
water ROVER DlScussed
Tho present electric lighting plant
in the Nuuanu Valley at Reservoir No.
| obtains its power from two pipe
lines 10 and 80 inches in diameter.
1.-The l5-inch steel pipe line was laid
from Luakaha weir to reservoirs mum
bered three and two and to the power
house at the city electric light station
In the Nuuanu Valley at Reservoir
No. !. y, ..y
total eDrtS the of fA Snp powHr t"'' Hns
feet, of which 1850 feet is wooden