Environmental Assessment
Volume B-3.8
Mine
Hydrology
Ambatovy Project
106
January 2006
Table 3.8.10 Changes in January Water Depths and Velocities at Monitoring Locations
(a)
– Operation Year 20
Baseline
Operation
Operation - Percentage Change
Basin
Station
Flow
(m
3
/s)
Flow
Area
(m
2
)
Average
Depth
(m)
Max
Depth (m)
Average
Velocity
(m/s)
Flow
(m
3
/s)
Flow
Area
(m
2
)
Average
Depth
(m)
Max
Depth
(m)
Average
Velocity
(m/s)
Flow
(m
3
/s)
Flow
Area
(m
2
)
Average
Depth
(m)
Max
Depth
(m)
Average
Velocity
(m/s)
Sahamarirana QESF-100
0.22
10.39
1.14
1.70
0.02
0.27
11.07
1.14
1.78
0.02
23%
7%
0%
5%
0%
Sahamarirana QESF-114
0.63
2.77
0.92
1.18
0.23
0.67
2.84
0.95
1.20
0.24
6%
3%
3%
2%
4%
Antsahalava
QESF-106
0.33
1.06
0.39
0.52
0.31
0.39
1.19
0.44
0.57
0.33
18%
12%
13%
10%
6%
Ankaja
QESF-110
0.35
6.27
0.96
1.55
0.06
0.43
6.31
0.97
1.57
0.07
23%
1%
1%
1%
17%
Sakalava
QESF-109
0.21
1.16
0.20
0.37
0.18
0.22
1.16
0.20
0.37
0.19
5%
0%
0%
0%
6%
(a)
Flow characteristics at hydrometric monitoring locations.
Table 3.8.11 Changes in January Water Depths and Velocities at Monitoring Locations
(a)
–Closure
Baseline
Post-Closure
Post-Closure - Percentage Change
Basin
Station
Flow
(m
3
/s)
Flow
Area
(m
2
)
Average
Depth
(m)
Max
Depth
(m)
Average
Velocity
(m/s)
Flow
(m
3
/s)
Flow
Area
(m
2
)
Average
Depth
(m)
Max
Depth
(m)
Average
Velocity
(m/s)
Flow
(m
3
/s)
Flow
Area
(m
2
)
Average
Depth
(m)
Max
Depth
(m)
Average
Velocity
(m/s)
Sahamarirana QESF-100
0.22
10.39
1.14
1.70
0.02
0.27
10.76
1.18
1.74
0.03
23%
4%
4%
2%
50%
Sahamarirana QESF-114
0.63
2.77
0.92
1.18
0.23
0.68
2.87
0.96
1.21
0.24
8%
4%
4%
3%
4%
Antsahalava
QESF-106
0.33
1.06
0.39
0.52
0.31
0.39
1.19
0.44
0.57
0.33
18%
12%
13%
10%
6%
Ankaja
QESF-110
0.35
6.27
0.96
1.55
0.06
0.39
6.29
0.97
1.56
0.06
11%
0%
1%
1%
0%
Sakalava
QESF-109
0.21
1.16
0.20
0.37
0.18
0.23
1.21
0.20
0.38
0.19
10%
4%
0%
3%
6%
(a)
Flow characteristics at hydrometric monitoring locations.
