Environmental & social impact assessment for the proposed construction of sewerage system in Maamigilli, Alifu Dhaalu Atoll, Maldives

Abstract

This EIA report is prepared for the construction of a sewerage system in the island of Maamigilli Alifu Dhaalu Atoll. The project will be implemented by MWSC.  The proposed project aims to establish a sewerage system where household wastewater gets collected in to a sewer network and gets discharged into the open ocean via an outfall. Surveys and assessments were done in Maamigilli to identify the best possible option and suitable system including evaluating alternatives to the project.  The proposed system will ensure that the groundwater of the island does not get contaminated through improper sanitation systems. It will also ensure that the groundwater and the surrounding marine environment will improve in terms of environmental quality and will ensure pollution from sewage does not occur. These measures are expected to bring multiple positive impacts to the health of the people other than improving the environmental quality.  Various alternatives to the proposed system were also studied. One of the options identified include treatment of sewage and the use of vacuum systems. Based on the assessment, these alternatives were assessed to identify their potential application in Maamigilli against the proposed system. Advantages and disadvantages of these options have also been discussed in the report.  The island‟s existing sanitation is developed on traditional septic tank system. All the houses have toilet facilities which have onsite septic tanks. The ground water of the island is been used for toilet flushing and for purposes other than drinking. The main portable water is from the private water tanks in individual houses or from the community water plant. Desalination plant is operated in the island by Villa Shipping and Trading Company.  The assessment reveals that the project can be implemented without significant impact on the natural environment of the island.  The impact area due to the implementation of the project would be the loss of vegetation from the construction of the pump station, excavation and laying of the sewer network and the reef environment due to the construction of the outfall. These impacts would be unavoidable as trees have to be cleared from the site before construction can begin for the pump station. The outfall needs to be properly anchored to hard substrate of the reef.  Therefore, the most significant direct impacts are going to be resulting from the loss of flora and fauna from the area where the pump station as well on the marine environment where outfall will be constructed. The Maamigilli Island Council will provide compensation to the owners of the coconut palms or trees that need to be removed from the land allocated for pump stations.  The proponent and contractor should avoid any project activity that will directly impact the MPA of Maamigilli. Waste water outfall should be monitored in regular basis to study the impact area.  The proponent of the project shall develop necessary plans and implement the mitigation measures in association with relevant agencies to mitigate the predicted impacts.  Several alternatives for the proposed project have been identified and they are discussed in detail. For this project, proposed concept is the best option. The current concept is designed after an initial survey by MWSC. Outfall location is proposed after the stakeholder consultation and EIA survey.  All activities of the project will be closely monitored by Maamigilli Island Council. A monitoring plan is developed for this project. It is very important to adhere this monitoring program to study whether the projected impacts.  In light of this assessment, the proposed project has been found to have more positive than negative impacts, both environmentally and socially. It is crucial for the client to manage the project in consultation and assistance with other stakeholders if the environmental impacts are to be minimized.