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Salton Sea 1995 Hydrographic GPS Survey

Summary and Conclusions

This Reclamation report presents the 1995 results of the first extensive survey of the Salton Sea. The primary objectives of the survey were to gather data needed to:

The bathymetric survey was run using sonic depth recording equipment interfaced with a DGPS (differential global positioning system) capable of determining sounding locations within the reservoir. The system continuously recorded depth and horizontal coordinates of the survey boat as it was navigated along gridlines covering the Sea. The positioning system provided information to allow the boat operator to maintain course along these gridlines. Water surface elevations recorded by a USGS gage during the time of collection were used to convert the sonic depth measurements to true Sea bottom elevations.

The 1995 underwater surface areas at predetermined 1-foot contour intervals were generated by a computer graphics program using the collected data. The above-water areas were measured from digitized USGS quad maps of the Sea. The new topographic map of the Sea is a combination of the digitized and underwater measured topography (figs.2 and 3 or complete topographic map). The area and capacity tables were produced by a computer program that uses measured contour surface areas and a curve-fitting technique to compute area and capacity at prescribed elevation increments.

Table 1 contains a summary of the Salton Sea's watershed characteristics for the 1995 survey. The 1995 survey determined that the Salton Sea has a storage capacity of 9,420,566 acre-feet and a surface area of 262,517 acres at water surface elevation 220.0 feet below sea level.

RESERVOIR SEDIMENT
DATA SUMMARY

SALTON SEA
NAME OF RESERVOIR

DATA SHEET NO

D
A
M

1. OWNER California

2. STREAM 1

3. STATE California

4. SEC. 21 TWP. 11S RANGE 11E

5. NEAREST P.O. Indio, Ca

6. COUNTY Imperial/Riverside

7. LAT 33°11'33" LONG 115° 49°59"

8. TOP OF DAM2

9. SPILLWAY CREST 2

R
E
S
E
R
V
O
I
R

10. STORAGE
ALLOCATION

11. ELEVATION TOP OF POOL

12. ORIGINAL SURFACE AREA, Ac

13. ORIGINAL CAPACITY, AF

14. GROSS STORAGE

15. DATE STORAGE BEGAN

1905

a.SURCHARGE

b.FLOOD CONTROL

c. POWER

d. WATER SUPPLY

16. DATE NORMAL OPERATION BEGAN

e. IRRIGATION

f. CONSERVATION

g. INACTIVE

17. LENGTH OF RESERVOIR

33MILES

AVE. WIDTH OF RESERVOIR 10 - 15 MILES

B
A
S
I
N

18. TOTAL DRAINAGE AREA

8,360 SQUARE MILES

22. MEAN ANNUAL PRECIPITATION 2.5 INCHES

19. NET SEDIMENT CONTRIBUTING AREA

8,360 SQUARE MILES

23. MEAN ANNUAL RUNOFF -- INCHES

20. LENGTH MILES

AV WIDTH MILES

24. MEAN ANNUAL RUNOFF -- ACRE-FEET

21. MAX. ELEVATION 11,502'

MIN. ELEVATION -278

25. ANNUAL TEMP. MEAN 73F RANGE 118°F to 26°F

S
U
V
E
Y

D
A
T
A

26. DATE of SURVEY

27. PER.28. ACCL.

29 TYPE OF SURVEY

30. NO. OF RANGES OR

31. SURFACE AREA, AC

32. CAPACITY ACRE-FEET

33.CI RATION AF/AF

2/95

Contour (D)

2-FT
262,5175
9,420,5665

26. DATE of SURVEY

34.PERIOD ANNUAL PRECIP.

35. PERIOD WATER INFLOW, ACRE FEET

WATER INFLOW TO DATE, AF

a. MEAN ANN.

b. MAX.ANN.

c.TOTAL

a. MEAN ANN.

b. TOTAL

26. DATE of SURVEY

37. PERIOD CAPACITY LOSS ACRE FEET

38. TOTAL SEDIMENT DEPOSITS TO DATE, AF

a. TOTAL

b.AV.ANN

c. /ML2-YR

a. TOTAL

b. AV. ANNUAL

c. /ML2-YR

26. DATE OF SURVEY

39. AV DRY WT (#.FT2)

40. SED DEP.TONS/MI.2-YR

41. STORAGE LOSS, PCT.

42. SEDIMENT

a. PERIOD

b. TOTAL TO

a. AV. ANNUAL

B. TOT TO DATE

a. PER | b.

43. DEPTH DESIGNATION RANGE IN FEET BELOW, AND ABOVE, SPILLWAY CREST ELEVATION

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN DEPTH DESIGNATION

26. DATE OF SURVEY

44. REACH DESIGNATION PERCENT OF TOTAL ORIGINAL LENGTH OF RESERVOIR

0 - 10

10-20

20-30

30-40

40-50

50-60

60-70

70-80

80-90

90-100

105-110

110-115

115-120

120-125

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN REACH DESIGNATION

N/A

Table 1. - Reservoir sediment data summary (page 1 of 1)

45. RANGE IN RESERVOIR OPERATION4

WATER YEAR
MAX. ELEV.
MIN.ELEV.
INFLOW. AF
4

4
1962
-233.3
-234.6

1964
-231.3
-232.6

1966
-232.1
-233.3

1968
-231.7
-232.7

1970
-232.9
-232.9

1972
-231.4
-232.6

1974
-230.8
-232.0

1976
-229.5
-231.1

1978
-228.1
-229.1

1980
-227.2
-228.7

1982
-227.4
-228.5

1984
-226.8
-227.7

1986
-226.9
-228.1

1988
-227.1
-228.2

1990
-227.7
-228.7

1992
-227.3
-228.7

1994

WATER YEAR
MAX. ELEV.
MIN.ELEV.
INFLOW. AF
1961
-233.8
-235.0

1963
-232.4
-233.9

1965
-232.1
-233.3

1967
-232.0
-233.0

1969
-231.7
-232.8

1971
-231.7
-232.8

1973
-231.1
-232.3

1975
-230.2
-231.6

1977
-228.6
-229.5

1979
-227.9
-229.4

1981
-227.1
-228.2

1983
-227.1
-228.7

1985
-226.9
-228.0

1987
-227.1
-228.3

1989
-227.3
-228.6

1991
-227.8
-228.8

1993
-226.9
-228.6

1995
-227.2
-227.9

46. ELEVATION - AREA - CAPACITY DATA FOR A995 TOTAL CAPACITY (below sea level)

ELEV.FT
AREA.AC
CAP.AF
-278.6
-278.0
-276.0
-274.0
-272.0
-270.0
-268.0
-266.0
-264.0
-262.0
0
432
13,073
34,395
57,079
80,641
98,334
109,561
119,237
127,812
0
130
12,526
58,593
149,950
287,921
468,618
676,899
905,824
1,153,139

ELEV.FT
AREA.AC
CAP.AF
-260
-258.0
-256.0
-254.0
-252.0
-250.0
-248.0
-246.0
-244.0
-242.0
135,213
141,845
148,347
154,609
160,491
166,302
172,553
179,821
187,711
195,524
1,416,238
1,693,360
1,983,551
2,286,530
2,601,713
2,928,466
3,267,194
3,619,490
3,986,856
4,370,319

ELEV.FT
AREA.AC
CAP.AF
-240.0
-238.0
-236.0
-234.0
-232.0
-230.0
-228.0
-226.0
-224.0
-222.0
-220.0
202,308
208,424
214,542
219,690
226,249
233,277
239,125
244,973
250,821
256,669
262,517
4,768,194
5,178,926
5,602,108
6,036,321
6,482,138
6,941,595
7,413,997
7,898,096
8,393,890
8,901,380
9,420,566

47. REMARKS AND REFERNCES

1 Primary use is a repository for storage of agricultureal dranage from Coachell and Imperial Valley. Inflow from Whitewater, Alamo, and New rivers, and from San Felipe and Salt Creeks.

2 Natural topographic degression filled in 1905-07 when colorado River breached a man-made diversion structure.

3 Summit of San Gorgonio Mountain.

4 Multiple records available from USGS for Salton Sea water surace elevations starting in November 1904. USGS discharge data available on the creeks and rivers listed on Remark No. 1. Discharge records do not account for all drainage inflow.

5 Surface area and capacity at elevation 220.0 feet below sea level.





48. AGENCY MAKING SURVEY Bureau of Reclamation
49. AGENCY SUPPLYING DATA Bureau of Reclamation
Date May 1995

Table 1. - Reservoir sediment data summary (page 2 of 1)

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