The Oroville weekly gazette. [volume] (Oroville, Wash.) 1905-19??, 1917-01-12

|structing its flow. The river at tha
point Is about 300 feet wide with ar
average depth at low water Of 3 II
feet. The gates are formed Of IS incl
channels to close the IA inch openingi
under the curtain walls. They have
skeleton extensions Of light angles t.
prevent binding in the guides. The
gate stills are at the level Of the river
bed at the shore, and at low water the
maximum required for the canal 10 sc.
cured even If the depth Of flow over the
slls Is not more than OF feet.
The gate structure IL placed practic.
|ally in line with the shore. The ends OF
the piers are faced with H bars to
form guides for flash boards. Steel
rails were bolted on the face Of these
H bars, parallel with the river, to de.
fleet drift wood. Except at extreme low
water 1t is expected that one or two
Is inch flash boards will be left on the
bottom of the guides to prevent gravel
from being carried over the gate silla
and into the canal.
A sluiceway on the downstream end
of the gate structure can be closed by
|flashboards to raise the level few in
|ches at extreme low water II necessary
When the sliceway is open, 1t. with the
diversion dixie, produces securing &C.
tion in front OF the gates which pre-.
vents the accumulation of sand and
|gravel. The diversion dyke Is very
low and extends diagonally up stream
about one-third the width of the river.
AS it Is made of loose boulders. water
flows over and through 1t at all stages
of the river. The dyke defects the flow
toward the gates.
The Similkameen siphon carries a
maximum Of 104 sec.-ft. across the
Similkameen river at point II miles
below the head works. It is a 48 in.
wood stave pipe. 2913 IT. long banded
for a maximum head of 1872 It. The
maximum band spacing Is ten inches.
Both ends are increased in diamater
from as to go inches, in a length Of IL
feet.
The inlet structure, of concrete Is
designed to reduce entrance losses to
a minimum. The pipe diverts PRACTICAL
ly at right angles to the main canal on
a steep hillside. A curved diversion
wing extending upstream into the
main canal Ia intendent to divide the
water into two portions. 104 eft.
going into the pipe and SO sec.-ft. con-
tinuing in the north branch ditch.
Complete control of either line 10 Sc
cured by one set Of flash boards in
the concrete structure. For less than
maximum flows, flashboards are In
serted until the desired depth II ss-
cured In the north branch, the water
to the pipe spilling over the dashboard.
This method of control was not costly.
1t also has been found to be very elas-
tic.
In passing from the main canal to
the pipe the velocity Of the water is in
creased from 2.24 to $40 feet per sec
ond. This increase Is effected in q
length of AZ feet with gradually de-
creasing areas and gradual transition
of form. AS the pipe connects with a
wooden flume the outlet structure Is
built of wood. In that structure the ve-
locity undergoes a reduction from 90
to 2:30 It. per second, which would
have meant loss Of IL It. II proper
means had not been adopted. The areas
were gradually increased and CONVEX
sion from round to square section was
effected as shown in one Of the draw
ings. 1t is expected that nearly all Of
the velocity head will be recovered by
this manner of transition.
At both ends of the pipe where the
static head is less than 20 It., the FIR
slaves were given a shop treatment of
immersion for ten minutes in bath of
hot "firoleum," a product OF the distil-
lation of fir wood which resembles cre-
|osote but is somewhat cheaper. After
the inside of the bell ends
were give two coats Of hot creosote.
The whole pipe was then painted with
one coat Of water gas tar. The preser-
'vatives were heated and applied by
spraying, using compressed air from a
portable gas engine outfit.
The pipe was laid above ground
wherever possible, but in crossing cul-
|tivated lands it was sometimes neces-
sary to bury it. A wooden bridge COM
posed of two 120 #. Howe truss spans.
with pile bent approaches, carries the
lime over the Similkameen river.
The north Okanogan siphon crosses
the Okanogan river just above Oroville
and carries 81 sec. IT. to the east side
|of the valley. The pipe is 80 inches in
diameter. To the Y where 1t branches
north and south to supply laterals, is
|7635 IT. The north branch Is made up OF
43S it. of IS inch and 378 feet Of 20 In,
machine banded pipe The south
branch is an 1S in., pipe $50 IT,. long
The intake to the 30 in., pipe and the
[outlet of both branches are concrete
The same plan Of applying preserva-
|tives and paints was used on this as on
the Similkameen siphon.
From each branch there Is a com.
pound pipe of 10 and IL in., sizes with
a gate valve, leading to a common con.
crete surge box Each of these waste
pipes is so designed that when the
valve is open for the maximum flow
the friction and velocity heads in i,
are equal to the static and friction
heads in the main pipe beyond the
point where the waste pipe joins. In
the extreme end Of each branch pipe 9
simple butterfly gate was installed
This was made of 1-2 inch lumber
mounted on in, iron shaft and SC
designated that the gate may be helt
in any position. BY manipulation o.
this butterfly gate with the gate valves
in the waste pipes complete regulation
is secured.
This pipe line crosses the Okanogar
lat ~~f~