The Hawaiian gazette., 1895-01-04
LETTER FROM E. KOPKE.
HoNoLuLu, December, 1894
R. 3. f. DILLINGHAM.
f General Manager 0. Il. d Il. Co.,
Honolulu.

u. IA.
Honolulu.
)EAR SIR:-At your request | have carefully looked
mo the problem of irrgating the lands OF the proposed
Oau Sugar Company situated in Eva district, Oahu.
Tor this purpose have made myself acquainted with
II different points of interest the lands and have
bore me survey, given to me by Mr. Z. H. kluegel.
sbwng the areas under different levels and other I'M
LTtant matters
In my calculation of pumping expenses have taken
tures from actual experience and have been careful TO
dow liberal margins everywhere. In determining the
mount of water required per acre have taken fer my
asis 25 per cent than is used on Eva plantation
nd have counted on 250 days lrragatlng per year
hereas 200 days than on an average irrigation
I'LL be carried on especially as these lands have the
enet of showers of which do not reach the lower
ands
Cal Springs There is a stream at the lower part OF
these lands which obtains its water from springs which
was measured by MeSsrs. Alardt and Schuyler, both
engineers of high standing, and found to hoW over az
cubic feet of water per second this amount OF water
will irrigate $500 acres of land This amount OF
water can undoubtedly be increased as some OF the
springs supplying the stream discharge their water
several feet about the bottom of the creek and by lower
ing their place of discharge the amount OF water will
be increased How much this increase will be can only
be found by trial and cannot enter into this calculation
(b) Artesian wells All artesan wells which have
been bored in this district have shown wonderful
supply of water There are IL ten-inch wells on EVA
pantaton all in space of 150 feet by 100 feet which
deliver constantly through the dres part OF the year
fifteen million gallons per day without showing any
diminuton in the supply. About one-thlrd OF mile
from this station there is another with six wells
which delivers seven and half million gallons with
the same results all these wells to the west OF the
proposed Oahu Sugar Company. 10 the east there
are the wells in Pearl City and the peninsula which give
an abundance of water. | am not able to give the
capacity of either of these wells but of them have
been exhausted by pumping.
There is no reason to believe that wells on this pro-
posed plantation will not do just well as the ones
mentioned above One OF two wells dug at the very
place. where proposed pumping STATION is to oe placed
would certainly expel all doubt, if there is any, In
regard to the water supply by arteslan wells
There seems to be good chance of storing storm
water in reservoirs The water might be led out OF the
gulches by bitches fumes and stored IN reservoirs
situated above the fields AS this is problem for
civil engineer to solve shall not enter into it any
further.
The amount of water and the height it has to be
lifted being considerable it becomes absolutely neces
sary that only very large steam pumps OF the most
approved designs and construction be used In order
to obtain very high degree of economy With the
different types OF pumps on these Islands USED for the
efficiency are obtained Having the data of the more
important of these machines very valuable points
may be obtained for purchasing and erecting new
plant of this nature.
COST OF IRRIGATION PER
In starting the plantation the lower lands say under
800 feet elevation, will be planted first and more
land will have to be taken in the adjacent lands above
will under cultivation up to $50 feet above sea
level This elevation takes in area of over 10000
acres shown in map before mentioned.
1t is evident that the lower lands will cost less for
irrigation than the upper ones and therefore irrigation
expenses for the first years will be less than afterwards
when the higher lands have been taken up. cannot
at this moment determine how land under different
elevations will under cultivation and shall there
fore take the average height of all the lands under $50
feet elevation and base on this the calculation Of ex
penses. The average height is obtained by multiplying
the different by their respective heights adding
these products together and dividing the of these
products by the total number of acres which gives
average height above level of 44O eet deduct from
this the artesan water level 30 feet leaves 4l0 feet
AS it is proposed to plant 1000 per year. have
figured pumping plant of this capacity and get the
following:
per per year. S45 50
2OOJ 90
Two assistants 24OO 90
Two oilers and four fremen 1000 1900 90
waste, packing per 5000
Incdentals 1000 1900 90
Per 30