The Coalville times. [volume] (Coalville, Utah) 1894-1923, 1912-03-08

onhUAllOn lTaln Lecture.
Tho greater part Of the land In the
west would be practically worthless
without water with which to irrigntc
II. yet there is far less attention
given 10 the measurement OF this
water than there Is to the measure.
ment of the land Under the Carey
Act the land Is sold to the settler
for 30 cents per acre and would
hardly be worth that without the
water, while water costs the settler
all the way from s25 to 500 per
acre.
Miners Inch.
Water was first used In Idaho and
other western states for mining pur
poses. the common method OF meas.
urement being called the miners
inch method. The miners inch was
the unit upon which such measure.
ment was based, being the amount
OF water that would flow through a
sharp edged orihce ono inch square
under given pressure. The guam.
tity called for by miners inch.
however, varied In different states.
due to the fact that the pressure over
tho Orifce was not the same.
Cubic Foot per Second.
The cubic foot per second. which
represents definite tangible amount
that is easily understood. was adopt.
cd as the legal standard for the
measurement of water by the Idaho
legislature In 1899. II Is commonly
known as the second foot" and rep.
resents the flow OF water which will
exactly iill a vessel containing one
cubic foot each second OF time for
rs long period as II Is allowed to
now. Hence. n flow Of one cubic
foot per second delivers 60 cubic feet
per minute. or 5000 cubic feet per
hour, or $1,000 cubic feet in u day OF
twcnty.four hours.
II Is found that one cubic foot per
second equals flow OF almost exactly
80 Idaho miners inches, or $50 gallons
per minute. a numc one foot wide
and one foot deep, II filled with water
that Is flowing at the rate Of exactly
one foot per second. will carry one
cubic foot per second. and otncr
fumes or bitches In the same proper.
ton. The quantity discharged de.
Ponds upon the velocity Of the flow
and the area Of cross section Of the
advancing stream OF water. These
two factors are taken into consider.
alton when determining the flow OF
large streams and canals. II being
only necessary to determine the area
OF the cross section and the average
velocity. which two amounts multi.
piled together gives the discharge.
The cross section Is found by multi.
plying the average depth OF the
stream by the width. The average
velocity Is found by measuring the
rate OF the same either with floats
or with current meter especially
constructed for the purpose. A close
approximation OF the velocity can be
secured by noting the time that is
required for surface float to nd.
vance through 100 or more llneal
feet OF the ditch. This gives the sur.
face velocity, and TO find the average
velocity one must multiply the sur.
face velocity by IS. since the aver.
age velocity is that much slower
than the surface velocity, owing to
tho friction on the sides and bottom
OF the channel.
Acre Foot.
Where large volumes Of water are
TO be considered the expression OF
the amount In cubic feet would In.
yolye the use OF such largo numbers
that the same would be cumbersome.
In order to simplify those expires.
sions the term "acre.foot" Is used,
which represents enough water 10
cover an acre one foot in depth or
1850 cubic feet. The use OF this
term has tho additional advantage OF
being easily compared with the acre.
age; as for example. a reservoir con.
tanning 10000 acre feet OF water
would furnish depth OF two feet |
for 10000 acres OF land. A cubic |
foot Of water per second flowing con. |
for twenty.four hours fur.
nlshes almost exactly Two acre feet ]
Of water
Hydraulic Equivalents Which VIII be
Found Useful to IrrIgators.
!, Idaho miners inch equals ap- .
proximately $50 OF cubic foot per
second, or nine gallons per minute.
2. Tho flow OF cubic foot per
second equals approximately 90 min.
er's inches, or $50 gallons per min.
ute.
3. One cubic foot per second for
"a hours equals approximately 2 acre
feet.
A. one acre foot equals enough
water TO cover an acre exactly a
loot In depth, or 1850 cubic feet.
o. one miners inch per acre for
100 days equals 397 feet deep on the
land,