Environmental Assessment
Volume B-3.8
Mine
Hydrology
Ambatovy Project
103
January 2006
Table 3.8-9 Changes in Mean Monthly 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
302,493
303,910
0%
0%
0%
0%
0%
0%
0%
0%
0%
Sahaviara
114,353
116,374
1%
1%
1%
1%
0%
0%
0%
Sahamarirana
234,444
235,835
1%
0%
0%
0%
0%
0%
0%
0%
Torotorofotsy
276,152
276,152
0%
0%
0%
0%
0%
0%
Sakalava
239,672
239,672
0%
0%
0%
0%
0%
0%
year 4
Ankaja
391,878
395,578
1%
1%
1%
1%
1%
0%
0%
0%
Antsahalava
302,493
335,040
10%
9%
9%
8%
6%
4%
4%
2%
2%
Sahaviara
114,353
128,619
9%
8%
6%
5%
3%
2%
1%
Sahamarirana
234,444
258,178
9%
8%
7%
5%
5%
3%
2%
2%
Torotorofotsy
276,152
290,982
5%
3%
3%
2%
2%
1%
Sakalava
239,672
248,855
4%
4%
3%
3%
1%
1%
year 10
Ankaja
391,878
393,040
0%
0%
0%
0%
0%
0%
0%
0%
Antsahalava
302,493
337,715
11% 10%
9%
9%
7%
5%
4%
2%
2%
Sahaviara
114,353
132,519
12% 10%
8%
7%
4%
2%
2%
Sahamarirana
234,444
264,951
11% 11%
8%
7%
6%
4%
3%
3%
Torotorofotsy
276,152
288,298
4%
2%
2%
2%
2%
1%
Sakalava
239,672
266,591
11% 10%
10%
8%
4%
3%
year 15
Ankaja
391,878
421,990
7%
6%
5%
5%
4%
4%
3%
2%
Antsahalava
302,493
339,663
11% 11%
10%
9%
7%
5%
5%
2%
2%
Sahaviara
114,353
134,929
14% 11%
9%
8%
5%
2%
2%
Sahamarirana
234,444
268,082
13% 12%
9%
8%
7%
4%
3%
3%
Torotorofotsy
276,152
299,909
8%
5%
4%
4%
3%
2%
Sakalava
239,672
245,858
2%
2%
2%
2%
1%
1%
1%
1%
year 20
Ankaja
391,878
451,341
14% 11%
11%
9%
8%
7%
6%
3%
Antsahalava
302,493
378,323
23% 22%
20%
19%
15%
10%
9%
5%
4%
Sahaviara
114,353
144,117
20% 16%
13%
11%
7%
4%
3%
Sahamarirana
234,444
299,394
24% 23%
18%
15%
13%
9%
7%
5%
Torotorofotsy
276,152
301,349
8%
5%
4%
4%
3%
2%
Sakalava
239,672
270,218
12% 12%
11%
9%
4%
3%
post-closure
Ankaja
391,878
440,964
11%
9%
9%
8%
7%
6%
5%
3%
Notes: Blanks indicate location not included in hydrologic model.
