Gunnison news-champion., 1912-10-04
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lepartnseni ct lrriasison EneIneer-
snS At shs Agr,oulsaral College read
sns spmeshsas like this: Il wish ~
install a pumping plant on my land.
| wish - raise the wsser tweaty feet
high; wsnt enoseh water 10 Irri-
gate eighty acres Of land What size
pump shall l order and what horse
power engine viii be necessary to Do
the work."
This brings up immediately tive
qsestions. The duty Of water and
also the efficiency Of the pumping
plant ID NAV he safely stated that
one second foot Of water delivered
from a pumping plant will be ample
10 rlgste eighty acres Of ordinary
Colorado land and will furnish
ample supply Of water 10 raise ordl-
nary farm crops upon it. La fact.
we should do better than this, and
should make one second foot of water
irrieate and take care Of the crops ON
from 100 to l20 acres Of our land
California farmers make one second
foot of water irrieate from 800 to 500
acres and in time We will do the
same, but much money must be
spent upon our canals and latersls
before this can be done. So for an
ample supply, let us say that one
second foot will irriaate 80 acres.
One second foot Of water equals
450 gallons per minute; therefore a
pump delivering 450 gallons per
minute should be purchased. When
we come 10 figure horse power peces-
sary to raise this amount of water
twenty feet high we 20 back TO the
Physics we studied when we we're
bows
II you will think back over those
times, | think you will remember
that when one pound is raised one
foot high, one "foot-pound" of work
has been done; if that pound is
raised 20 feet high. twenty foot
pounds of work have been done. A
good sized horse, weighing from
l,400 to 1000 pounds, can do
sufficient work TO raise a 550-pound
weight one foot high each second
and keep it up all day, and day after
day. Consequently we have a unit
for the rate of doing work which is
called the horse power" and it is
equal to $50 foot-pounds per second.
Our engines are all rated in horse
power. When one cubic foot of
water, or 450 gallons, is delivered
each second, the weight of this water
is 62l pounds. If this is raised 20
feet high we would be doing 20
times 62a or l,250 foot pounds of
work each second Dividing this
by $50, we have 23 NEARLY. This
is the theoretical horsepower re-
quired to raise one second foot of
water twenty feet high.
Our machinery, however, is not
perfect, for there is work lost in
friction-friction of the water in the
pipe and also in the turns and ell
bows-hence il will take more than
. 2.3 horsepower engine to do the
work desired. The efficiency of an
ordinary plant will not usually run
more than so per cent-perhaps 40
per cent would be a better figure
so the % horsepower represents
just 40 per cent OF the power neces-
sary, or the sized engine to order
would De 1UU times one -fOrtleth OF
%, which is practically six horse
power.
Another thing that every farmer
should remember, and that is, when
water lie forced through pipe, the
faster it travels, the greater the loss
in friction The loss is equivalent
to increasing the pumping head;
hence it is better to use large pipes
instead Of small ones. 1t is also
best to have a. few turns or elbows
as possible, and it is simply ques-
ton which must be decided for each
individual plant, - to what sized