The Hawaiian gazette., 1904-11-22
WATER DEVELOPMENT
ON VALLEY ISLE
Continued from page 5.)


tainly result if the underground flow
was fully and properly developed.
There is now flowing into the Poll
poll cistern two streams of water, one
from the surface spring and one from
the tunnel. During the dry weather
some months after the work at Poll
poll was discontinued, the flow was
measured and showed an increase of
from 1000 to 1900 gallons over the mini
mum flow for dry weather.
The total cost of the actual labor ex-
pended on the Polipoli tunnel above de-
scribed was less than $500, showing
that valuable results can sometimes be
obtained in this work with very little
expense. The writer's services were
donated in this case pro bono publico."
Tunnels in these soft formations,
however, sometimes cost considerable
to maintain as they are apt to cave
during the rainy season.
Further development work at Poll
poll properly conducted would certain
ly yield favorable returns, while bun
Cling work will just as surely damage
the flow.
In the tunneling operations described
above an attempt has been made to
show how simple it is to follow the
thoroughly understood principles of
water development, when conditions, as
| above, are almost ideal.
An attempt will now be made to de-
scribe operations in formations where
nature wrote the key to success in
hieroglyphics instead of in the simple
lettering that guided the work just de-
scribed.
KAUAULA TUNNEL.
This tunnel is located in the West
Maui mountains about ten miles from
Lahaina, and was projected to develop
irrgating water for the Pioneer Plan
tation.
The Kauaula tunnel system consists
of a main tunnel and several branches.
The longest haul at this date is about
23OO feet with ramifications that bring
the total tunneling up to over 5000 feet.
The abount of water developed toldate
is 5000, 900 gallons per "a hours, with in
dications that the most stable flows are
still far ahead.
The tunnel is located in an extinct
at an elevation of $500 feet. The walls
of this crater rise perpendicularly for
nearly 5000 feet above the tunnel level.
A great many difficulties had to be en-
countered at the outset of this work,
the country being practically inaccessi-
BILE when it came to the transportation
of heavy ma Chinery
1t required great courage and deter
mnation on the part of the principals
to go to the considerable expense of
even giving this project a preliminary
test. The right man happened to he in
the right place, I'm the person of the
manager of the Pioneer Min Company,
Limited. All difficulties We're smodthed
over. every requisit.on to improve the
plant was granted, until the Kauaula
tunnel has today the most complete
tunneling equipment on the Hawaiian
Islands, and equal to anything In the
most modern mining camps.
The air compressor that furnishes
power for the rock drills is belt-driven
by a 4S-inch Pelton wheel, fed with
stream water under 100 foot head,
At the mouth of the tunnel 2i-inch
Pelton wheel direct-counected 10 a
size NO. lthnlH hlNMflf lUhihAkHlN
yentilates the tunnel, The blower
forces air into the tunnel for 1900 feet
through iO.inoh pipe from where the
different branches are supplied through
S-lnoh pipes.
Tho rock drills are of the "Iuby"
type, gt.-iurh cylinder which are very
suitable fnr this work one Japanese
minor helus bhlr iu set uu ana operate
this drilL thus DOING away with the
assistant urrrssHr} on the lsigrr size,
Tho transportation facilities consist
Of portable tl,k with thr iron tirs
,ut down tp nn ls-lu,h EHusr aui mod
rrH automatic nu rlfH n t rH Hrr
ranged lh4t ihr iuHurl WHirr .Hults
un iHr lruris ffuW lhr iHnur. mouth.
rl fhrt .r uul iNH iiHi.lt nf U tsr
iUHa'fr dHHp in contend $500 Lately
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