WSP11081

• File Number: 8273.600.30
• Description: Colorado River Basin Salinity Control - Federal Agencies - USDA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1989
• Title: Intercepting Isolating and Reusing Drainage waters for Irrigation to Conserve Water and Protect Water Quality
• Water Supply Pro - Doc Type: Report/Study

.

44

J.D. RHOADES

N
CO
W
W

and returned to the river below the projects irrigation-diversion point. The
resultant "blend" of river and drainage water is assumed to flow to the next-
downstream project where the process is repeated. This process is repeated
through a succession of four projects. In strategy II, the bean, alfalfa andwheat
crops are also irrigated with the river water; however, their resulting drainage
waters are not returned to the river but rather are used to irrigate the cotton
crop grown within the same project. The drainage water resulting after cotton
irrigation is then returned to the river. This process is also repeated through
the succession of four projects, In strategy III, the crops are irrigated as in
strategy II, but the drainage water from the cotton crop is not returned to the

TABLE 1

Results of simulation under conditions of Strategy I; no reuse made of drainage water in the'
projects; all drainage water discharged back to the river-

Crop V" L Eel... ViVo' EC, Vd. BCdw Loss
in yield (%)
First project (volume of river=500; Ec=0.5 dS/m)
Beans 25 0.2 0.5 31.25 0.64 6.25 2.50 0
Alfalfa 40 0.1 0.5 44.44 0.94 4.44 5.00 0
Wheat 25 0.2 0.5 31.25 0.64 6.25 2.50 0
Cotton 14.4 0.15 0.5 16.94 0.75 2.54 3.33 0
Second project (volume of river = 395.6; EC = 0.63 dS / m)
Beans 25 0.2 0.63 31.25 0.81 6.25 3.15 0
Alfalfa 40 0.1 0.63 44.44 1.18 4.44 6.30 0
Wheat 25 0.2 0.63 31.25 0.81 6.25 3.15 0
Cotton 14.4 0.15 0.63 16.94 0.95 2.54 4.20 0
Third project (volume of river = 291.2; Ec=0.86 dS/m)
Beans 25 0.2 0.86 31.25 1.11 6.25 4.30 2
Alfalfa 40 0.1 0.86 44.44 1.62 4.44 8.60 0
Wheat 25 0.2 0.86 31.25 1.11 6.25 4.30 0
Cotton 14.4 0.15 0.86 16.94 1.30 2.54 5.73 0
Fourth project (volume of river = 186.80; EC= 1.34 dS/m)
Beans 25 0.2 1.34 31.25 1.73 6.25 6.70 15
Alfalfa 40 0.1 1.34 44.44 2.52 4.44 13.40 5
Wheat 25 0.2 1.34 31.25 1.73 6.25 6.70 0
Cotton 14.4 0.15 1.34 16.94 2.02 2.54 8.93 0
Remaining volume ofriver=82.4; Ec=3.03 dS/m

.Volume diverted from river for irrigation in each project = 123.88 units; volume of drainage re-
turned to river from each project = 19.48 units.

.. .:.'0.: ~"\. .

~.' :.." '~:., . ".', .

:.' ;':::,:.,i~,if.;J,t?;:,~'..~:.,:'.. .... '.:. ':',:,,:./\>;,:::;, .
':',};(,;r::' "..'.":';'!'}!(":.:,:

.",:-"

<:.:':"-..<:." ".":>"'

." ", :":"~::

~.., .

.~ ..'- '.

"

...../
..:" :.

~". .

'."",

... ." . ~ . -," ....., .'.-'
'. - .,,:/.~:~~~.....-' --~';:'-'''''''. .
.~ '. . . "'..:' '-~'~':"-,~

~. . ,. .

..
....

,\0'~iPf'~2:~~~'j~.!,~;g~;"f'~J

..

.' ......

. '.< :\.\:'

....
~. . .....
". '.

..... ". .-

.;......:-.

.:.::....: ,'.
.: ::>~~:'.:<;:.;<:>

" '.'

..;:..............:of'.

.-..' -,.......
.....:.;..... .'

.... :. ...,.

..
. '.,
'. , . ,~.;.
. . ~'" ."...' '> - ';.., .....
'.. ',,~: .

.:,..-....

. ..
,:;. ,:<-'(':".'::::~" -"':.'-:':

. .'.....
....'......

'. '.
.._'.:.... .-,: '..;".
.;'~.. "." :,.-;":-., ,.,: .:-: ".: ::':~:
.. '. . .-....~:r~:::<-: .;,:

:. - .~.
i:~;}:X:t;::.i::i;o< >';"':::i;::

~'. . -:.. -:....... '-~'f;'.::;"""-" .' ..' .
.. - . ~'.- .'. '.;. .
. ':. '.: . .'-~.' ":. ..-

........-_. '.
;..-:..>.;.:;.....~::.;'.'.:.:/.:. ,.'., "',-:':
,::.; ~

::~.?-:'''''' .'
".
..;::

.... "
.~, -,: :':.' .:.~ ".
" . .

.' ..... . .... . ....:.:>;~~-:

-. '.'

'.
. ....... ."

.....

'. '.' "'~~'. .