The Idaho Republican. [volume] (Blackfoot, Idaho) 1904-1932, 1922-05-18
.OO9 per cent less Alpine to Heise
Moran to Alpine
Moran to Heise ...-...--.---..5S,74O

NQOIdu W AlpAhC
Moran to Heise ....------.---.5S,74O
7,74o
S49,2S2-7,740,00O
besides absorbing all invisible gain
between stations. 4
Using the same reasoning as IN
the comments on the 1917 report
where we assume that the invisible
gain between Alpine and Heise for
the season would be one-half the
amount indicated as gain between
Moran and Alpine for the same
period as follows:
2-67,48O sec. it. invisible gain
Moran-Heise July l to August 81.
33,74O sec. IT. probable invisible
gain Alpine-Heise July l to August
81.
7,74O sec. it. loss during season
Alpine-Heise.
Heise 1,4SO-04.9 per
cent probable loss Alpine-Heise.
Then adding to the 4.9 per cent
loss Alpine to Heise the probable
loss by evaporation from wide chan
mel of 80 per cent from Moran to
Alpine (Which is discussed in an
other place;) equal 10 per cent loss
from Moran to Heise.
After studying Plate 8 of the 1918
report and the figures given above 1t
is apparent that the unmeasured in
flow for the season was IS per cent
less than for the same period in
1917 and the measured inflow is 13
per cent less for the same period
Notwithstanding the fact that the
total discharge for the period was
very near the same amount.
1t is probable that the weather
conditions during June, 1918 were
just right to move most OF the snow
and ice from the higher elevations
which ordinarily feed the tributary
streams and act as the reservoir
from which the invisible flow comes
From the foregoing it will be
noted that Mr.. LaRue sets this
transmission loss on storage water
between Moran and Heise at 10 pei
cent and the average of Plate 8 in
| Mr.. Baldwin's 1917 report is 12.4
per cent and of Plate 9 of same re.
port is SO per cent Of grand average
for both plates and five operations
is 9 per cent while the average OF
Plate IA in Mr.. Baldwin's 1918 re.
port is 3.9 per cent loss and that fol
Plate 5 shows 6.6 per cent, loss
Average of the two plates is So pei
cent loss. My own deductions based
on Plate 3 in Mr.. Baldwin's 1917 re.
port and Plate s of his 1918 report
together with certain assumptions
gives a loss of 10 per cent and rs
per cent respectively.
1t would seem that until NOR
complete data is available that II
per cent loss might be charged to the
storage water as transmission los:
after extending the Heise hydro
graph for six CO. to ten (10) days
parallel to the curve it followed
nearest before the arrival of storage
water; then in the event the gair
on the natural water is seen to b.
excessive between Moran and Heist
adjustment could be more, but a
the present time it appears that the
natural water users have been stand
ing too much of this loss.
Open discussion follows the read
ing of Mr.. Cotton's second recon
mendation.
Banks-"May l ask, Mr.. Cotton
how you arrived at the evaporation
loss on storage water between Jack
son Lake and Alpine?"
Cotton-'I based my estimate OF
one Of the Baldwin reports which in
dictated that to increase the flow b.
adding storage would cause the rive
to spread out from a half to three
quarters of a mile in width, over
gravely bed, filling blind channels
etc."
Swendson-"For the purpose o
these records will you state jus
what you based your estimate o
evaporation on"
Cotton-"In estimating the losse
by evaporation in certain of the up
per river sections referred to in m
written statement; I assumed tina
the storage water would increase tn
width of the river channel by a
average of 5000 feet; also that
used 2R feet at the total evapora
ton loss during the storage deviler
period"
Judge Cowen = "May l as
whether or not there has been an e,
pertinent made on the river by turn
ing loose a given quality of waite
from the reservoir and watching it
effect on the river at the variou
gauging stations below, with tn
purpose Of measuring the effect o
the river?"
Cotton-"I understand Mr.. L
Rue used this method"
Baldwin-"That is substantial
what is done whenever storage is re
leased"
Cowan-"Is it necessary to hav
inflow measurements unless the In
flow is variable to such an exten
that it would materially affect tn
results?"
Baldwin-"The inflow is dc
cidedly variable"
Banks-"If the stored water !
not charged with enough loss 20
would expect to find down at Heis