(PESIA) Weg naar Zee 2D Seismic - Staatsolie

P-all consultants Staatsolie Maatschappij Suriname N.V.
PESIA Weg naar Zee 2D Seismic 2012
5.6 SURFACE WATER
Hydrology
Wetland Area
The project could lead to changes in the hydrology of the Eastern Wayambo Swamp in the form
of:
• improving / accelerating drainage
• blocking the fresh water flow from the southern swamps toward the mangrove zone by
the construction of low E-W dams of clay and pegasse
• increasing swamp water levels
Such changes in the hydrology could have a moderate negative impact on the local ecosystems.
Proposed mitigation measures are:
• do not include construction of permanent dams or canals
• limit the projected trails in size and extension, compared to the dimension of the
Wayambo Swamp so they do not lead to increased blockage of water
• the project activities are very temporary
• level or interrupt dykes of clay, peat and vegetation debris along excavated trails
With these measures adverse ecological effects from changes in hydrology in the Eastern
Wayambo Swamp are therefore considered to be unlikely.
The project’s impact to hydrology will then be minor negative at most.
Table 25: Impact on hydrology
Impact on:
hydrology
Without
Mitigation
With
Mitigation
Dryland Area
Magnitude/
Intensity
/Size
Geographical
scale
Medium Small Long
term
Low Small Short
term
Duration Probability Severity Overall
significance
74
High medium Moderate
negative
Medium Low Minor
negative
No impact of the project on the hydrology of the dry land study area is expected.