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Title: | Environmental impact assessment for the proposed project to upgrade the sewerage system Manadhoo Noonu Atoll, Maldives |
Authors: | Sandcays |
Keywords: | Legislative and regulatory consideration Project description Project alternatives Existing environment Stakeholder consultations Mitigation measures Environmental monitoring |
Issue Date: | Sep-2013 |
Citation: | Sandcays. (2013). Environmental impact assessment for the proposed project to upgrade the sewerage system Manadhoo Noonu Atoll, Maldives. Male': Maldives |
Abstract: | This report discusses the findings of an environmental impact study under the proposed
sewerage system upgrading project at N. Manadhoo. The project is proposed by Fennaka
Corporation limited.
The project entails upgrading the sewerage system to improve the existing sewerage
treatment plant. The proposed upgrading involves incorporation of sea outfall with
pumping station as emergency outfall and modification or replacement of two fiber tanks
in the sewage treatment plant. The project has been proposed to repair the exiting
treatment plant as at the moment, due to damages to the STP raw wastewater is discharge
into the lagoon directly.
Upon recommendation from the consultants and in accordance with the existing
guidelines, an emergency bypass has been included in the design with one additional
pumping station. The emergency outfall will pump wastewater beyond the house-reef at
about 15m depth.
A number of alternatives to the proposed project components have been identified in this
document. Of these, the recommended alternative involves changing the proposed outfall
location slightly to east which will reduce the length of outfall pipe and hence lower the
implementation cost considerably. Other alternatives include considering different
emergency outfall environments such as ground and lagoon.
Environmental impacts were assessed for both the construction and operational phase of
the project. Most of the environmental impacts identified for the proposed development
were positive; these include reduced pollution of the marine environment and increased
aesthetic value of the beach. The main negative environmental impacts of the project
would be temporary loss of groundwater quality during the construction phase due to
dewatering and small amount of sedimentation around house-reef induced from installing
the emergency outfall. The latter could be regarded as insignificant due to its small
magnitude and spatial distribution. The proponent is willing to undertake monitoring
during and after the construction phase in addition to undertaking the mitigation measures
proposed by the consultants. The main mitigation measures for this project during the construction phase are similar to
other construction projects such as dust control plans, working during low- tide as much
as possible and rigorous supervision. As for the operational phase, implementation of
backup systems and trained maintenance staff to service the Sewage Treatment Plant
(STP) and regular check-ups were suggested in addition to monitoring seawater quality
around the outfall location.
In conclusion, it appears justified from a technical, administrative and to some extent
environmental point of view, to carry out the proposed project to upgrade and repair the
existing sewerage system. However, there are alternatives that may be more suitable and
shall be considered with caution and after understanding the costs and discussions with
relevant government authorities. |
URI: | http://saruna.mnu.edu.mv/jspui/handle/123456789/4001 |
Appears in Collections: | ތިމާވެށި Environment A
|
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