Imperial Valley press., 1913-06-12

. huildinc Of the tunnel nue which hd
| been discussed should be last resort
/ both on account of its high expense
and on account Of the possible conllic
hat would result from its construc-
tion without such settlement.
| would recommend that Mr.. And"r-
! son. NOur engineer. complete the study
of The duty If water that was begun
by Us Jointly while was IN the valley
and prepare table showing the aN-
rra@c duty Of water for an irrigated
lands in the Imperial valley. This
should not only snow the total mean
depth for the year nf water applied
under average conditions for all ihr
lands under irrigation. but il also
should show the monthly variation fol
such 4 year, a. Il indicated IN pi1t I
of the report uf Wafer Company Ne. /.
made by Mr.. CarherrY. 4 diagram "t
this monthly ratio should then 70" pre-
pared on the assumption that 800 .0Ou
. acres are t0 ne irrigated by your dI~
irict on the same ratio. ana to this
$4,000 acres should M added the
100. 900 acres under the Yuma project
and the prohahlr area to be irrigated
IN Mexico. which may be 300. 600 acres.
The duty Of water which we had TN
der consideration i based on I'll"
amount delivered To the various wafer
companies at the intakes Of their ca
mails. TO this should he added the
possible >eepage losses in the main
canal from The river to said intakes,
which | believe to he fully - per
cent in ease m All canal route is bull.
From the preliminary study which WE
made we assumed that This duty OF
water was y feet in depth. measured
at the intakes of the water companies
canals. This figure may properly be
modified hy q more complete study
hut il would appear from present IN
formation that the duty Of water. a.
measured at the intake in the Colo
RADIO river. would be approximately
i L acre feet. This total consumption
of water for the lower Colorado re
giOns. on both sides of the line. should
he compared month by month with
the available supply Of water in The
Colorado river during the periods for
which records are available. with The
view OF determining whether the Wa
ter supply for the total area contem-
plated is adequate or not. It j. my
impression that The last ten wears 0i
record for the Colorado river at Yuma
iS above average conditions Of wafer
supply and if possible a comparison
should be made with Older stream
g3nginG stations on tins river above
the canyon. in order to throw light
IN this fact. IN other words. if large
additional areas are included within
Your canal systems. you should at least
have some intelligent idea of whether
the water supply will be ample or not
for the contemplated area.
/ further recommend that Mr.. An
.+lerson be instructed to compute the
yardagc that would he inOvlved in the
construction Of tn" canal under con-
sideration. this computation {" he based
up0n the topographic maps which are
available both in your office and which
quite likely we could 0htsn from the
reclamation service. In considering
this canal. for the preliminary study,
would take the section of the con
duit proper which was prepared by me
when | was in Ell CentrO and OF which
Mr. Anderson has a copy, to be used in
conjunction with the tunnel route. but
modified for velocity of X feet per
second. instead Of 3 feet per second
A new section should also be prepared
for the purposes Of estimating for q
lined open canal, with velocities OF
feet per second and with a li-fOot
depth of water. with side slopes of the
waterway of z to / and the eXca-
walton slopes above the lined portion