, 1922-10-26

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through rapid sand filters. On tor
of the hill there will be constructed
a surge chamber where the water
will begin to flow by gravity toward
Rawlins.
For the pumping of the water
from the North Platte River the fol
owing plan is proposed. The Big
Ok Bow could be utilized by driving
. tunnel 7 feet wide by 8 feet high.
The total fall between the inlet and
'utlet ends of the tunnel is 23 feet.
This fall will he increased by build
ing across the North Platte River a
combination concrete and earth d.
Version dam, five feet above normal
low water. The concrete section OF
his dam will be constructed on bed
rock which Is about 10. feet below
normal low water. This makes the
total height of dam approximately
Is feet high. The concrete crest will
he approximately $50 feet in length.
There will be required an earth sec
ton 1910 feet long which serves In
passing all the flow over the concrete
section.
The tunnel will be $500 feet in
length and will IL found necessary
be concrete lined. AS this is a press
ure tunnel 1t Is our Judgment that
1t will have to be lined. as the rocks.
from an external examination, appear
soft and full of seams.
At the lower end Of the tunnel
there will be constructed proper re-
inforced concrete penstocks from
which the pipes will lead to the tur-
bines. These penstocks are equipped
with proper control and sluice gates
Two turbines driving two high grade
Triplex OF Duplex pumps will be in.
stalled in the power house. AS the
minimum flow Of the river Is moi
sufficient to drive both turbines
electric motors are also provided
which will drive the pumps by cleo
.ric power furnished by the Little o.
Bow.
At a point near Rawlins and above
the new proposed reservoir there
will need be installed some rapid SAND
filters similar TO those now used by
the Union Pacific Railroad.
The Little Ok Bow. located three
miles below the Big Ok Bow will be
developed as an electric plant. There
will be no pumps at the Little Oh
iBow. but the turbines will drive cleo.
trio generators. The power will BIZ
transmitted to the Big Ok bv an cleo
trio line 3.5 miles in length.
It .is proposed to deliver to Raw
Inns 5.43 second feet OF water or 3.
f6OD,0c6 gallons per "a hours. 1
twill: require 420 horse power tt
pump $40 second feet to the top o
the hill. The tunnel has been de
tsigned to carry to the turbines 25t
second feet OF water. with a loss o
head Of about 5 feet. leaving an Of
fective head At the turbine of % feet
With $50 feet flowing through thu
turbines there can be developed 45t
effective horse power which Is SUI
ticient to pump the water to the tor
lot the hill. When the flow Of thu
river falls below $50 feet there Il
not sufficient water to elevate $500,
900 gallons to the top Of the hill. I
ia then that the power from the Lit
tie OK Bow plant must be delivered
to the Big OK Bow plant to run thu
motors. as assistance to the turbines
AT the Little Or Bow the effective
head Ia 1917 feet. With ESQ fee
FLOWING to the turbines 400 available
horse power is developed. When tn
river is at minimum flow there will
be water for running only n gen
orator which will deliver I'll actua
horse power with 1875 second feet
All or part Of this power will have
to be transmitted to the Big OK Bow
at times of low flow. for running tn.
motors. At the upper power plan
two men will be required to operate
the plant.
At the lower plant two men viii
he REQUIRED when 1t Is operating. II
the winter time a force of additions
men will be needed to keep the in
takes and penstocks clean of frazilt
and floating ice which always e
with shallow river intake diversion.
with no storage, and three men tt
operate the filters.
Another OK Bow Plan.
The second plan of the OK Bow
developments will be to install gen
orators in both power plants ant
transmit all electric energy to
point where the minimum length o,
pipe line into Rawlins can be Sc
cured. "A pumping plant at tn,
canon site which would deliver 8,
SOC, 900 gallons per "a hours t.
Rawlins is planned.
At times when the river wa,
flowing $50 second feet or over
there could be generated at the twt
OK Bows, 1900 theoretical hors'
power. Emphasis is here laid upol
the fact that it Is one Of the most in
economical things that can be dom
in the power world to convert waite
power into electric power and thel
convert the electric power into me
%chanical power in the form Of motto
drive, Assume. in the case at han,
THAT We have sufficient water to gen
crate 1909 theoretical horse powe
at the two On Bows. Twelve pc
cent OF this wilt be lost in passinI
through the turbine: 10 per cent will
be lost in passing through the cleo
trio generator: another 10 per cen
| Will he Loaf In afanninR the xo1fan