The Idaho Republican. [volume] (Blackfoot, Idaho) 1904-1932, 1922-05-18
hour sec. It. Cor approximately 3d.
768 acre feet) loss from Alpine to
Heise, which is 2.18 per cent Of all
water passing Heise for this period.
The figures follow:
July 16 to August 81, Inc, 1917.
Total in river at Heise-----7O5,33O
Sec. Fl.
Measured inflow to Heise......652,049
Invisible gain Moran to Heise 53,281
Total in river at Alpine ..-~....689,85O
Measured inflow to Alpine. ..621,185
Invisible gain Moran to
Alpine oo,Ooo
Invisible gain Moran to
Amt. gain lost, Alpine to Heise
TOO. 33O-15.384-2.18 Pct,

is fair to presume that there would
be some such inflow, but possibly not
so much as the amount shown be-
tween Moran and Alpine, but sup
pose it were one-half the apparent
invisible gain between Moran and
Alpine, then by taking one-half the
invisible gain from Moran to Alpine
during the entire season and adding
to this the apparent loss from Alpine
to Heise Of the water which entered
the river as gain between Moran and
Alpine and dividing this by the total
water passing Heise for the season
gives 10 per cent loss as shown
Sec. FIT.
Invisible gain during season
Moran to Alpine ....---.--.6S,665
Divided by 2, possible invis-
ible gain during season,
Alpine to Heise ....-.---.--.34,332
Apparent loss during season,
Alpine to Heise .-..-.----..l5,3S4
Probable loss .......-.----.----.49,7lb
July 1 to Aug. 81 Inc,
Heise .~...7O5,33O Goa Pct.) 49,716
In the event $4,000 acre feet are
| stored at Jackson Lake and this Is
delivered in seventy days it would be
necessary to hold the discharge OF
storage water at about 5000 sec. it,,
which would increase the wetted
area on about thirty miles of fiat,
gravely river bed toe considerable de-
| gree filling up the lagoons and blind
| channels which would increase the
| evaporation and would store a good
deal of the water in the banks which
would be drawn off too late for our
irrigation season, this loss is apt to
amount to 80 per cent between
Moran and Alpine.
Then, if 80 per cent is a fair loss
from Moran to Alpine the total loss
from Moran to Heise must be 80 per
cent plus 10 per cent or 10 per cent.
The following is copied from Mr..
Baldwin's report from page 1S, year
' 1917: ..4...s
with the available data this
should be a problem which could be
solved with fairly definite results
provided all intermediate inflow was
upon the ground surface where it
could be measured or at lease esti-
mated. Under actual conditions,
however, with a net average gain be-
tween Moran and Heise attributable
to underground or unreasonable
inflow of over 1000 sec. #. the prob
lem becomes one exceedingly diff
ficult if not impossible to solve sat
isfactorily." '.t
1T is apparent that the addition
of any quantity of stored water to
the normal flow of the river must re-
suit loss even if the increase be
limited to evaporation from the ad-
ditional area of water surface"
1918 Report
This 1918 report Of Mr.. Baldwin's
takes up the matter of investigating
losses on Snake river about where
his 1917 report left off and first dis
cusses some of the difficulties of the
unprecedented high water which
washed out a good many gauges
caused channel shifts and broke
down some of the measuring cables
and in general delayed the gathering
of complete data about a month.
BY changing the gauging station
on Gros Venta river from Zenith tc
Kelley it developed that in this short
distance of the two or three miles
there was a loss of 27.6 per cent II
is thought that there is also losses
like this on the other tributaries anG
that their losses go to make up the
large unmeasured inflow to the river
at the lower stations.
Page II indicates that plate 10 i.
plated as unmeasured inflow, but il
really the total unmeasured inflow
minus losses, and show that thu
transmission losses exceed the in
visible gain by the amount shown.
Pages 20 and "a indicate that fol
several years 2.5 per cent loss has
been charged on the storage water
between Moran and Heise which ir
1918 would amount to 127 sec. it
during time storage was run; how
ever, this loss seemed to be al sec
#. or 2.6 per cent loss on $4,000
acre feet Of storage directly appar
ent and the amount of loss absorbed
by the unmeasured inflow is still
undetermined. y
On pages "a, rs and 26 mention
is made of how on Sept. II and IS Of
1913 when the river dropped rapid.
the loss of 141 sec. IT. changed to
net gain of about 800 sec. #. Also
in Plate 6 Of the 1917 report wher
river dropped from 5000 sec. TT. tt
. $500 Sec. #. and it is recommended
that the natural water users b.
given 400 sec. #. when the norma
river is falling from 5000 to $500
sec. IT,; evidently there 3 is waite,
stored in the banks along the rivel
during the spring runoff which il
not held in place by the stored watel
would come on and be used in thu
irrigation season. Whatever thi
amount is should be given to thu
) natural water users when they cal
make use of it.
:. The following have been WORKED
out and written in this discussion 81
! that comparison may be drawn will
similar examples for 1917, which
are also included July l to Aug. 81
1918, Inc.
Sec. Fl
: River at Heise .-.....-.--..849,28
Measured inflow Heise .......789,54
. Invisible gain Moran to Heise 59,74'
! River at Alpine ..-------..-818,3 30
. Measured inflow ..--.--.-..-..750,82