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<br />
<br />PLATE 11
<br />
<br />SALIN ITY AND FLOWS NEAR
<br />
<br />INTERNATIONAL BOUNDARY
<br />
<br />>- 8000T
<br />I- "oor
<br />-
<br />z
<br /> -4000
<br /> -
<br /> i
<br />-'
<br /><l 2000
<br />"'
<br />
<br />lions'
<br />I. 1HIIt<<l _II ~..~ dr.lnao. ...1. '.I'a'l.d ,n IS:I'I.
<br />r O~,lall dra. blOan aporalian a Flbr~lr, IO.IML
<br />J hll..II. ,,,""LI d,.,. and a,"I" b,-,..
<br />...an.,"'''. ..........b..lI,'.CS
<br />
<br />I -I i
<br />WELL TON-MOHAWK OUTFALL DR".
<br />/"'-. A. J ,J' I r\
<br />\"\ A
<br />..
<br />
<br />
<br />J ' J\ It, ,,, ''7-;- I -1', I "
<br />.......-__.1 ~, '.,l ..... ","_l.","-"-_'''' " ,-_,.... / \ ~-"",
<br />....... ..." ". - ~--'"'
<br />l...-----'r': ..."....~':"::':"......,..,..'...::.:.. ............... ....,.......... ..,......... ............,..u. ........u....
<br />.~ ......COLORAOO RIVER AT IMPERIAL D M
<br />
<br />, : 1\ clLORADD RIVERI AT IMPERIAL DAM
<br />
<br />~ -;-=-'-- -?-~+-,+-.j :', -- ---
<br />i\...fV \ !V \ :\!\ A/\ :';: I
<br />,',' ,--:-:- -'-' ":~---';-',,--:-
<br />. : :: :: ': .
<br />. .' ..
<br />. . . .
<br />. . . .
<br />" '
<br />
<br />"
<br />"
<br />"
<br />
<br />"
<br />, ,
<br />: '
<br />:; :
<br />
<br />12000,
<br />
<br />10000
<br />
<br />:-:-~
<br />
<br />2000
<br />
<br />,
<br />"
<br />,I
<br />1\
<br />--:T, " ' '
<br />I I " .... ., .
<br />: I l I ~ , :: COLORADO RLVER AT NO THERLY
<br />I. I. f\--t-:~, .: BOUNDARY OF MEXICO
<br />'-I- 1 . -, -'-' tT--
<br />, I.' . '" ,..' ", /t ... A" ~
<br />'," , 1 /I I \ j\" I' .,. I I , " \
<br />~ ~' \,.... ~, I, '......... I \ I \ I \,", ~ I" \ ,,: , !t " ' ,
<br />'.!'l \r\" 1I,II/\LL'\r I ',,1 llJl I\!\
<br />-'r-1il1'\l- ;:;r-~-vr' '1-\--' i' ! " \
<br />\ , WELL TON-MOHAWKI ~ ,.1 "I \ I'l V
<br />....J OUTFIA'-,~ "A'. I ..-, "
<br />
<br />" ,
<br />-!-;--i--:--;
<br />. .. .
<br />.' ..' ~. .
<br />
<br />" '
<br />.' :
<br />i:!
<br />, :
<br />_:_--:..
<br />, '
<br />
<br />....
<br />
<br />- ,
<br />"
<br />
<br />3:
<br />
<br />o
<br />
<br />8000,c---
<br />
<br />--'
<br />
<br />6000
<br />
<br />"-
<br />
<br />_000
<br />
<br />o
<br />
<br />1958
<br />
<br />1959
<br />
<br />1960
<br />
<br />1961
<br />
<br />1962
<br />
<br />196~
<br />
<br />196_
<br />
<br />196~
<br />
<br />1988
<br />
<br />CALENDAP' YEAR
<br />tion program, The staff made a study of the 1,300 parts per million would result in a 20 per-
<br />effect of salinity of water suppl~- on Imperial cent increase in farm delivery requirements for
<br />and Coachella valleys and the benefits that may Coachella Valley Count,'- \ Vater District, Owing
<br />occur by the mixing of a higher qualit~- water to a different cropping pattern, the same change
<br />suppl~- with Colorado River water. in river water quality would result in a 9 percent
<br />r' d'" , 'I I' increase in farm delivery requiremCl1ts for Im-
<br />uOO Irngatlon practice reqUIres t le app IC1- , I I ' , D' " I dd" h' I
<br />'f ' f ' pen" rngatlon IStflct, n a mon to Igl
<br />tlon 0 water III excess 0 consumptive use re- 'h"
<br />, "d' watcr reqUIrements, Igh operatmg expenses are
<br />qlllrements III ur er tu carrv away the salts that'd . I I f h' I' I"
<br />I . tl ' f 'h Tl ' associate Wit 1 t le use 0 water Ig1 III sa Ill!t\",
<br />accumu ate III 1e root zone 0 t e crops, liS - ,
<br />excess water, called the leaching requirement, The contracts between the California agricul-
<br />increases in proportion to increase in salinity of tUfal agencies and the Secretary of the Interior
<br />the water. Plate 12 shows the approximate rela- arc in terms of a fixed quantity of water, 3,8;0,-
<br />tionship betweCl1 water requirements and salin- 000 acre-feet per ycar for thc first three Cali-
<br />ity of supply based upon the 1963 and 1964 fornia priorities, The fixed supply combined
<br />crop records for Imperial and Coachella ,'alleys, with the increased unit water deliver~- require-
<br />For example, the graph shows that an increase ments due to higher saline content of the water
<br />in total dissolved solids in the ri\Tr from 900 to could rcsult in reduced irrigated acreage and
<br />
<br />32
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