WSP10809

• File Number: 8273.500
• Description: Colorado River Basin Salinity Control - Federal Agency Reports - EPA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 4/1/1978
• Title: Integrating Desalination and Agricultural Salinity Control Alternatives
• Water Supply Pro - Doc Type: Report/Study

Again, solution of the subsystem analysis for the range of
possible salt reductions, 0 ~ xf ~ Xf, yields the relationship:

Y k = f (x~) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (40)

f.\3 x3 = total annual salt load reduction for the kth river
k subsystem (level 3) ;
0)
N Yk = total costs of reducing x~ tons of salt from the
0 subsystem; and
m = number of subbasins per river subsystem.

At the final level, level 4, corresponding to the solution
of the salinity control strategy at the river basin scale,

,Q,

Y = min Z y~ ....................................(41)
k=l

subject to,

x3 < x3
k k

k==1,2,..., ~................................. (42)

~
l:
k=l

x3 =
k

XT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (43)

where,

XT

Y
~

= total annual reduction in salt load expected in the
basin;
= total costs in achieving a XT reduction; and
= number of river subsystems in the basin.

By varying XT over its possible range and obtaining the basin-
wide cost-effectiveness relationship,

Y = f(XT) .............................................(44)

planners and regulatory agencies have information they can
utilize in deciding what degree of salinity control to implement,
where to implement it, and what measures to employ.

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