The Arizona sentinel., 1905-01-04
THE GREAT COL ORADO RIVER


The great Colorado river is the largest
stream, both in drainage area and discharge.
that lies wholly within the arid portion Of
the United States. Ii is formed by the juno
ton ofthe Greer and Grand rivers, rising in
Colorado and Wyoming respectively, in re-
gions of great precipitation, mainly In the
form of snow. Only a small percentage of the
water yielded by the basin of the Colorado
has as vet been utilized for irrigation, and
practically none for any other purposes. The
obstacles are many. Through most Of its
course this river and its tributaries flow at
the bottom of profound canyons, from which
1t Is impossible to divert them upon irrgable
lands. The river efnerges from its canyon IL
short distance above the Needles-the cross
ing Of the Santa Fc Pacific ralroad-lnd has
series of valleys which between this point
and the Mexican line aggregate about JO,tOo
acres. In this region the waters are heavily
laden with sediment, which is serious OBJ
stacle 10 their diversion The grade OF the
river IS so fiat that n diversion canal taken
out at the rivers bed must have so slight a
fall and so low a velocity that it would
quickly fiji with sediment from the river.
For the same reason a canal smuSt be very
long in order TO command any considerable
area of land in the river valley.
TWO AND QUARTER BILLION GALLONS A
MINUTE.
Measurements of the flow near Yuma show
that the river sometimes discharges q mini
mum of about 5000 cubic feet per second. It's
maximum discharge is unknown, but proba-
bly, exceeds One-half million cubic feet per
second AS the river is supplied mainly by
melting SHOWS, its season of high water Gull
inmates in June, and the low water season is
In the winter. when its sources are frozen.
The river is navigated more or less from its
mouth to the Needles by fiat-bottom stern
wheel boats, which sometimes even ascend to
the mouth of Virgin river. It's navigation,
however Is so difficult and precariOuS as to
make it almost useless. At low water the
channel is SO broad, shallow and changeable
that boats are continually running aground.
sometimes being nearly a week in advancing
ten or fifteen miles. IN times Of high water
the swift current greatly irnpairs navigation.
Wherever wagon transportation is possible,
this Is preferred TO the river.
The chief obstacle to the utilization of the
waters OF this basin are: First, the great
fluctuation in discharge; second, the paucity
Of land that cen be reached by them; third,
the large quantity Of sediment. making i'm
practicable any diversion on small scale.
comprehensive project is here presented,
which, If upon investigation, IS found inn
practicable, will largely remove all of these
difficulties, and will also greatly improve
navigation at all seasons of the year.
The development OF the mineral resources,
In which this country is rich, is greatly ham
pered by the great cost of power and the lack
OF transportation, both important requisites
for the mining industry. The proposed plan
sUBTRoPICAL CLIMATE.
All of the land that can be irrigated from
the lower Colorado may be regarded as hav-
d. ag IL semi-tropical climate, where the grow
ing season for most products continues the
year round-the requirements for water, how
ever, being greater in the summer season than
in the winter. 1t is here assumed that the
maximum use in July will be .wice as great
as the minimum requirements in January;
and that q stream with the maximum flow of
two cubic feet per second in July, furnishing
about 1000 ncre-feet per annum, will supply
200 acres OF land.
II is probable that with proper regulation
the Colorado river will be able to furnish
orr of rl
uses, varying from 10000 cubic feet per second
in winter TO 10000 cubic feet per second in
summer, in years of smallest discharge, al
lowing the great floods of wet years 10 sweep
to the sea as at present This will be suffi-
cient to irrigate 2000,000 acres of land, and is
so far i'll excess of the requirements below the
Grand Canyon that no restriction need to be
put upon storage and diversion OF waters
from the tributaries of the Colorado.
A considerable portion Of the valleys OF the
lower Colorado consists of SanSy flood plains
subject to occasional nundationS, and rough,
gravelly foothills with soil unsuitable for cul-
tivation. There are also considerable areas
of sand dunes, and some tracts rendered bar
rem by alkali. All these it is proposed to re-
claim by impounding upon them the sill
which annually passes down the Colorado
river.
SERIES OF DAMS.
The general plan here proposed is the pro-
vision of a series OF reservoirs on the Colo
RADIO river by the construction of high dams
favorable and where the possible storage is
large. All of these dams will be provided
with large sideways through the base, in
order that the stored waters may be entirely
drawn off, together with their load Of silt,
il is found desirable to do SO. The
reservoirs will serve as settling basins for Sed
lment. The dams will also be utilized TO
raise the waters into canals, for the coIble
purpose of enclosing more irrigable lands by
such canals and of giving them n velocity
sufficient to carry large amount of sediment
IfAd tfnHn
the fields. The declivity given to the canals
will depend largely upon the character ofthe
soil, and Will be the highest permissible with
out involving destructive erosion. The fall of
the Colorado river IL so slight that reser-
voirS Of enormous capacity may be construct
ed without involving dams of impracticabe
height. At any time, by opening the sluce-
ways OF The reservoir, the current of the river
will quickly cut q channel through the de-
posted sediment from the upper end of the
reservoir to the sluice gates; this being the
longest dimension and deepest part of the
will In all cases form an important
part of this storage capacity, and to this ex-
tent every reservoir can be permanently kept
clear of sediment without expense. With
this exception. each reservoir Is expected to
gradually I'll; when this occurs il is proposed
To draw down the surface of the reservoir
permanently 20 TO 80 feet, and to convert all
Of the reservoir site except the river channel
into irrigated farming land and, If necessary.
another reservoir for storage pur-
poses higher up on the stream. This policy
Will greatly increase the arabic area. 1t VIII
then be practicable, whenever desired, TO
close the Sluices and inundate all of the agrl-
cultural land in each filed reservoir and thus
fcrtiliZe il, as is naturally done by the river
Nile for the valley. This is done artifcially
In some parts Of Europe and Africa. With
the deep, alluvial soil, semi-tropical climate
arid atmosphere, abundant water supply
and the possibility of fertiiizing the fields
every year without expense. it is believed
hat such regions can be farmed the year
round, and several crops taken off annually
an acreage production being thus attained
entirely without precedent in history.