Environmental Assessment
Volume B-3.8
Mine
Hydrology
Ambatovy Project
102
January 2006
Table 3.8-8 Changes in January Flows at Various Distances Downstream of
Runoff Collection Ponds
0 (Pond Outlet)
Distance Downstream of Pond (m)
Scenario
Watershed
Baseline
Flow
(m
3
/month)
Development
Flow
(m
3
/month)
500 1,000 1,500 2,000 3,000 5,000 6,500 7,500 10,000
Antsahalava
668,879
685,881
2%
2%
2%
2%
2%
1%
1%
1%
1%
Sahaviara
252,860
268,052
5%
4%
3%
3%
2%
1%
1%
Sahamarirana
518,406
535,101
3%
3%
2%
2%
2%
1%
1%
1%
Torotorofotsy
610,633
610,633
0%
0%
0%
0%
0%
0%
Sakalava
529,968
529,968
0%
0%
0%
0%
0%
0%
year 4
Ankaja
866,529
893,272
3%
2%
2%
2%
2%
1%
1%
1%
Antsahalava
668,879
795,920
17% 16%
15%
14%
11%
8%
7%
3%
3%
Sahaviara
252,860
306,657
16% 13%
11%
9%
6%
3%
2%
Sahamarirana
518,406
619,342
17% 16%
13%
10%
9%
6%
5%
4%
Torotorofotsy
610,633
674,881
10%
6%
5%
5%
4%
3%
Sakalava
529,968
573,583
8%
8%
7%
6%
3%
2%
year 10
Ankaja
866,529
880,473
1%
1%
1%
1%
1%
1%
1%
0%
Antsahalava
668,879
815,159
20% 19%
18%
17%
13%
9%
8%
4%
4%
Sahaviara
252,860
319,328
20% 16%
13%
12%
7%
4%
3%
Sahamarirana
518,406
637,757
20% 19%
15%
12%
11%
7%
6%
5%
Torotorofotsy
610,633
666,743
8%
5%
4%
4%
3%
2%
Sakalava
529,968
639,005
20% 19%
18%
14%
7%
5%
year 15
Ankaja
866,529
973,874
11%
9%
9%
8%
7%
6%
5%
3%
Antsahalava
668,879
822,542
21% 20%
19%
17%
14%
9%
9%
4%
4%
Sahaviara
252,860
326,505
22% 18%
15%
13%
8%
4%
3%
Sahamarirana
518,406
644,823
22% 20%
16%
13%
11%
8%
6%
5%
Torotorofotsy
610,633
690,224
12%
7%
6%
6%
5%
3%
Sakalava
529,968
571,732
8%
7%
7%
5%
3%
2%
year 20
Ankaja
866,529
1,078,956
22% 18%
17%
15%
13%
11%
10%
5%
Antsahalava
668,879
836,555
23% 22%
20%
19%
15%
10%
9%
5%
4%
Sahaviara
252,860
318,674
20% 16%
13%
11%
7%
4%
3%
Sahamarirana
518,406
662,025
24% 23%
18%
15%
13%
9%
7%
5%
Torotorofotsy
610,633
666,348
8%
5%
4%
4%
3%
2%
Sakalava
529,968
597,511
12% 12%
11%
9%
4%
3%
post-closure
Ankaja
866,529
975,069
11%
9%
9%
8%
7%
6%
5%
3%
Notes: Blanks indicate location not included in hydrologic model.
