Environmental Assessment
Volume C-3.1
Slurry Pipeline
Topography and Geomorphology
Ambatovy Project
22
January 2006
successful implementation of erosion control measures, as erosion along steep
slopes could lead to larger-scale impacts on valleys and watersheds.
An overall residual impact classification for topography and geomorphology for
each phase of the project is presented in Table 3.1-3.
Table 3.1-3 Residual Impact Classification for Topography and Geomorphology
Phase
Direction Magnitude
Geographic
Extent
Duration Reversibility Frequency
Environmental
Consequence
Key Question TG-1
What Effect Will the Slurry Pipeline Have on Topography and Geomorphology?
construction
negative
low
local
long-
term
no
continuous
low
operations
negative
low
local
long-
term
no
continuous
low
Prediction Confidence
The baseline status of topography in the LSA is well understood. However, the
eventual form of the landscape following construction is not yet certain. Impact
ratings are dependent on the success of the mitigations proposed, including
erosion control and slope stability engineering. Overall, the prediction
confidence for this assessment is considered medium.
Monitoring
No monitoring is proposed specifically for topography and geomorphology.
Monitoring of the effectiveness of erosion control measures, slope stability and
reclamation success are described in Volume C, Section 6.
3.1.6
Conclusions
The slurry pipeline and its associated infrastructure will have a low consequence
for topography during the construction and operation phases. The pipeline is not
expected to have an impact on unique topographic features. No additional effects
or changes for topography are expected during the closure phase; the landscape
will remain in an altered state for the long term after closure.
