Table 11. Painted Rock Reservoir storage capacity in 1953, 1985, and 1993.
Reservoir
Storage capacity loss (acre-ft)
Storage capacity (acre-ft)
elevation
1953
1985
1993
1953 to
1985 to
1953 to
Date
(ft abv. MSL)
(survey)
(survey)
(Landsat)
1985
1993
1993
4 Dec 93
532.10
266
34
0
231
34
266
2 Nov 93
578.51
140,816
119,317
99,843
21,498
19,475
40,973
1 Oct. 93
594.65
327,750
311,811
269,280
15,939
42,532
58,470
30 Aug 93
604.88
507,600
490,756
427,929
16,844
62,827
79,671
29 Jul 93
612.32
664,360
650,071
573,090
14,289
76,981
91,270
27 Jun 93
620.61
878,995
861,693
769,297
17,303
92,396
109,698
26 May 93
631.06
1,197,215
1,181,071
1,072,738
16,144
108,333
124,477
10 May 93
637.75
1,434,250
1,419,975
1,302,822
14,276
117,152
131,428
24 Apr 93
644.22
1,691,910
1,678,818
1,553,409
13,092
125,409
138,501
8 Apr 93
651.68
2,029,608
2,010,199
1,876,677
19,409
133,522
152,931
31 Mar 93
655.24
2,202,760
2,181,275
2,044,759
21,485
136,516
158,001
7 Mar 93
665.86
2,755,090
2,743,331
2,595,400
11,759
147,931
159,690
Spillway elev.
661.00
2,491,700
2,476,339
2,334,804
15,261
141,535
156,796
Table 12. Painted Rock Reservoir sediment depth estimate.
Sediment
Reservoir elevation
Area of
Volume loss in
depth in
increment (ft)
incremental
incremental incremental
Lower
Upper
ring
layer
ring
Date
bound
bound
(acres)
(acre-ft)
(ft)
2 Nov 93
empty
578.51
7,779
19,440
2.50
1 Oct 93
578.51
594.65
5,549
23,057
4.16
30 Aug 93
594.65
604.88
4,295
20,296
4.73
29 Jul 93
604.88
612.32
3,832
14,154
3.69
27 Jun 93
612.32
620.61
4,433
15,414
3.48
26 May 93
620.61
631.06
6,415
15,938
2.48
10 May 93
631.06
637.75
4,182
8,819
2.11
24 Apr 93
637.75
644.22
4,449
8,257
1.86
8 Apr 93
644.22
651.68
4,861
8,113
1.67
31 Mar 93
651.68
655.24
2,837
2,994
1.06
7 Mar 93
655.24
665.86
6,508
11,415
1.75
680
660
640
620
600
580
1953 (Survey)
560
1985 (Survey)
1993 (Landsat)
540
500,000-acre-ft loss
520
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
Storage Capacity (acre-ft)
Figure 6. Elevation vs. storage capacity, from 1953 and 1985 surveys, 1993 Land-
sat estimate, and hypothetical case of 500,00-acre-ft loss of capacity.
13
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