The Oroville weekly gazette. [volume] (Oroville, Wash.) 1905-19??, 1916-03-10
Nv HINTS FOR IRRIGATORS.


order to answer the many inqui.
that are made to this office con-
Ing the proper size of fumes and
to use in extending the distrib-
system to the farm units, the fol-
hg information and data is sub
3D.
general the distribution system
be built to the margin of each 40
tract or legal subdivision at the
point, or at sufficient elevation to
h the high point as far as practic-
The land owner must build his
distribution within the farm unit
be quantity of water allowed is
Client to cover the land to a depth
IL feet in an irrigation season of
months The system has sufficient
Acity to cover the land to a depth
IL inches in one month. This rate
tesents the maximum summer de-
id for one month, say, and is equiv
ID to one second foot for each 100
s or nearly one-half a miners
per acre.
he capacity of the distribution sys-
built by the district and that to
built on the farm units must be
Bib larger than that rate would indi-
, on account of the necessity of
Eiding for the rotation method of
very.
elivery of water by the continuous
; method means that water is de-
)red to the farm units at uniform
3 that will give the required depth
1-2 feet in the five months. This
1t the rate of one second foot for
D. 1913 acres or 2-5 of a miners
d per acre. This method has been
Md by experience to be entirely i'm
5cticable for small tracts and is
N wasteful of water.
Delivery by the rotation method"
hns that each farm unit is given all
water that can be handled effec-
ply for few days each month. On
3 project the rotation heads" adopt
fare:
For 10 acres, 0.5 second foot (25
hers inches.)
For 20 acres, 10 second foot, $50
hers inches.)
For 80 acres, 1.5 second feet. (75
hers inches.)
Tor 40 acres, 20 SECOND feet, (lO0
ler's inches.)
Thus landowner with ten acres
puld provide capacity in his farm
tribution system for 0.5 second foot
! miners inches); tract of 40 acres
build provide for a capacity of 200
eond feet. For tracts larger than 40
les no additional capacity is requir-
|up to 200 acres.
By this method of delivery an owner
BIZ 20 acres would have 100 second
pt of water for as many days as re-
dred to give him the depth desired
tim ,eason of the year. The rota-
|n heads given above will cover the
mber of acres given to Il depth of
70 foot per day, hence, during Aug
|, if he wishes to cover his tract to
depth of 1-2 foot, he would run the
tier five days. This means, of course,
at water will have to be cared for
night. lrrigators should make all
operations beforehand so as to be
lie to care for the water night and
y when it comes to his tract.
The types of flume recommended are
ade of l IA inch rough pine for the
les and bottom, with 3x4 inch posts
ID collars, spaced eight feet apart.
like the side boards to the bottom
ank with 16d nails, 16 inches apart
ID spike the sides and bottoms to the
A sills and side posts with 18d nails.
Sc 1X4 inch rough for top ties and
aces for posts. Use 3x6 inch one-foot
ng for footing blocks. These should
dipped in coal tar or creosote.
A 12x12 inch flume, that is, with
le IL inch bottom board and two IL
ch side boards, will carry two second
et if built with fall of 5 inches per
0 feet. A 12x1O inch flume, bottom
ank l2 inches wide and ten inch
lie boards. will carry 30 second feet.
12XS inch flume will carry 200
cOnd feet on a grade of "a inches
II 100 feet; a 10x10 inch flume will
try 10 second feet on grade of
inches per 100 feet; a 10xS inch
me will carry 10 second feet on a
'ade of 10 inches per 100 feet; a 10xS
ch flume viii carry 0.50 second feet
| grade of IL inches per 100 feet;
SIG inch flume will carry 0.50 second
ct on a grade of II inches per 100
ct.
The smallest flume used by the dis
let is 12XS inches and on farm units
} flume smaller than Sx6 inches
ould be used. The grades given above
C the minimum falls at which the
lmes will carry the quantity indi-
ted.
j. G. STEVENS,
Engineer in charge of the West Okla
'gan Valley Irrigation District.
CarDenterS are making a SWeeDin @