Environmental Assessment
Volume E-5.3
Tailings Facility
Land Use
Ambatovy Project
213
January 2006
Table 5.3-4 Tailings Basin Rice Water Requirements
Month of the Year
(a)
Wet
Wet
Wet
Avg
Avg
Avg
Avg
Dry
Dry
Dry
Dry
Avg
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sept
Oct
Nov
Dec
Year
available water for A1a
(b,c)
437,010
437,010
437,010
291,360
291,360
291,360
291,360
98,670
98,670
98,670
98,670
291,360
3162,510
water needs for A1a
1,478
440
0
10
0
674
846
982
1,036
1,242
1,326
1,204
9,238
water needs for A1na
206
62
0
2
0
96
116
136
144
172
184
166
1,284
available water for A2a - water needs A1na & A1a
803,516
804,698
805,200
536,778
536,790
536,020
535,828
185,032
184,970
184,736
184,640
535,420
5833,628
water needs for A2a
38,326
11,352
0
242
0
17,472
21,920
25,478
26,894
32,166
34,374
31,170
239,394
available water for A3a - water needs for A1a & A1na & A2a
996,160
1024,316
1036,170
690,526
690,780
672,538
667,898
215,894
214,416
208,910
206,606
658,240
7282,454
water needs for A3a
47,126
13,958
0
298
0
21,484
26,952
31,348
33,068
39,550
42,270
38,324
294,378
available water for B1a
376,560
376,560
376,560
251,040
251,040
251,040
251,040
62,640
62,640
62,640
62,640
251,040
2635,440
water needs for B1na
4,504
1,332
0
28
0
2,052
2,574
2,994
3,160
3,778
4,038
3,662
28,122
water needs for B1a
18,019
5,337
0
114
0
8,214
10,306
11,979
12,644
15,122
16,162
14,653
112,550
available water for B2 - water needs B1a & B1na
599,887
615,741
622,410
414,788
414,930
404,664
402,050
105,327
613,188
295,596
294,296
396,615
5179,492
water needs for B2a
0
0
0
0
0
0
0
0
0
0
0
0
0
available water for B3a
283,327
299,181
305,850
199,568
199,710
189,444
186,830
56,637
55,806
52,710
51,410
181,395
2061,868
water needs for B3a
9,209
2,727
0
58
0
4,198
5,267
6,122
6,462
7,729
8,260
7,489
57,521
available water for A5a - water needs for A1na,A1a, A2a, A3a, B1na, B1a, B2a, B3a
2146,282
2229,942
2265,150 1509,358
1510,110
1455,920
1442,130
458,351
453,982
437,631
430,776
1413,442
15753,073
water needs for A5a
992
294
0
6
0
452
567
659
696
832
889
806
6,194
available water for C1a
455,940
455,940
455,940
303,960
303,960
303,960
303,960
100,500
100,500
100,500
100,500
303,960
3289,620
water needs for C1na
833
247
0
5
0
380
476
554
584
699
747
677
5,203
available water for C2a - water needs C1a
693,877
694,463
694,710
463,135
463,140
462,760
462,664
156,496
156,466
156,351
156,303
462,463
5022,827
water needs for C2a
7,583
2,246
0
48
0
3,457
4337
5,041
5,321
6,364
6,801
6,166
47,363
available water for C3a - C1na-C2
975,974
981,898
984,390
656,227
656,280
652,444
651,467
219,465
219,155
217,997
217,512
649,436
7082,244
water needs for C3a
37,542
11,119
0
238
0
17,114
21,471
24,957
26,344
31,507
33,673
30,530
234,494
water needs for C3na
3,883
1,150
0
25
0
1,770
2,221
2,582
2,725
3,259
3,483
3,158
24,257
available water for A6a - all water needs above
2984,350
3103,787
3154,050 2101,626
2102,700
2025,338
2005,647
665,068
658,821
635,480
625,693
1964,693
22027,252
water needs for A6a
2,183
647
0
14
0
995
1,249
1,451
1,532
1,832
1,958
1,776
13,638
(a)
Based on Hydrology calculations: three simulations completed, for dry, average and wet months; each month has been placed into the category that best fits it.
(b)
Water available is equal to predicted flow levels minus needs in upstream areas. For example, available water for A3a is flow predicted into A3a minus flow usage of A1a, A1na, and A2a.
(c)
Notation for watersheds: first letter (A,B,C) refers to main watershed in tailings facility, 2nd digit refers to sub-basin (higher numbers farther downstream), small “a” refers to watershed in which flows are affected by tailings facility, small “na” refers to watershed in which flows are not
affected.
Assumes 50% water loss due to inefficiencies in canals, etc, thereby doubling need of the volume of water to grow the rice.
