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Table S-1
RECAP OF PROJECT FEATURES
Salton Sea Project, California

Plan A
Plan B
Plan C
Plan D
No Plan

Area of Impoundment

50 sq. mi.

30 sq. mi.

30 sq. mi.

40 sq. mi.

-

Remaining Salton Sea Area

310 sq. mi.

330 sq. mi.

330 sq. mi.

320 sq. mi.

360 sq. mi.

Dike Length

Constructed by hauling

14.6 mi.

9.9 mi.

9.9 mi.

11.3 mi.

-
Constructed by dredging

22.3 mi.

11.9 mi.

11.9 mi.

15.7 mi.

-
Total Length

36.9 mi.

21.8 mi.

21.8 mi.

27.0 mi.

-

Brine Disposal System

Capacity
-
95 ft3/s
195 ft3/s
-
-
Pipeline length
-
46.7 mi.
46.7 mi.
-
-
Number of pumping plants
-
4
4
-
-
Total pump lift
-
1,800 ft.
1,800 ft.
-
-
Fresh Water System

Number of wells
-
95
195
-
-
Depth of Wells
-
500 ft.
500 ft.
-
-
Collector pipelines,
total length
-
105 mi.
152 mi.
-
-
Construction Cost

$65,000,000

$105,000,000

$141,000,000

$58,000,000

Annual Operation Cost

Adjustment phase

$416,000

$2,488,000

$4,709,000

$251,000

-
Maintenance phase

$416,000

$ 104,000

$ 104,000

$251,000

-

Table S-2
RECAP OF PROJECT EVALUATION
Salton Sea Project, California

Plan A
Plan B
Plan C
Plan D
No Plan

Project Performance

Length of time to return salinity
to 35,000 p/m

12 years
14 years
8 years
18 years
-

National Economic Development Account

Benefits (ann. equiv.)

User benefits 1/

$3,000,000

$ 2,973,000

$ 3,396,000

$ 2,774,000

Externalities benefits2/

28,491,000

28,748,000

29,235,000

27,943,000

Total NED Benefits

$ 31,591,000

$ 31,721,000

$ 32,631,000

$ 30,717,000

Costs (ann. equiv.)

Construction & I.D.C. 3/

$ 4,540,000

$ 7,579,000

$ 10,246,000

$ 4,057,000

OM&R

389,000

1,542,000

1,999,000

235,000

Total NED
 Costs

$ 4,929,000

$ 9,121,000

$ 12,245,000

$ 4,292,000

Net NED Benefits

$ 26,662,000

$ 22,600,000

$ 20,286,000

$ 26,425,000

Regional Development Account

Beneficial Effects

extensive,
high value
extensive,
high value
extensive,
high value
extensive,
high value
none

Adverse Effects

none
none
none
none
substantial

Environmental Quality Account

Beneficial Effects

extensive,
high value
extensive,
high value
extensive,
high value
extensive,
high value

small, med. value

Adverse Effects

minor
minor
minor
minor
substantial

Social Well-Being Account

Beneficial Effects

very favorable
very favorable
very favorable
very favorable
none

Adverse Effects

very minor
very minor
very minor
very minor
major
1/ Fish and wildlife and recreation benefits.
2/ Primarily land enhancement; includes minor increased net income to local suppliers of recreation equipment.
3/ Interest during construction.