Please use this identifier to cite or link to this item:
Title: Enviromental impact assessment : Development of sewerage system at Thulusdhoo, Male’ Atoll
Authors: Land and Marine Environmental Resources Group
Issue Date: 1-Feb-2017
Citation: Land and Marine Environmental Resources Group. (2017). Enviromental impact assessment : Development of sewerage system at Thulusdhoo, Male’ Atoll. Male': Maldives.
Abstract: The non-technical summary outlines the findings of the Environmental Impact Assessment of the construction of a sewage collection and disposal system at K. Thulusdhoo. The proponent of this project is the Ministry of Environment and Energy and total estimated cost of the project is USD 3.4 million. The project involves establishment of a gravity type wastewater collection, treatment and disposal system on Thulusdhoo. The sewerage system to be set up comprises a gravity sewerage system where sloping pipelines will allow waste water from the entire island to flow to four zonal pumping stations. The pumping stations will transfer the sewage collected through a pressure main to the sewage treatment plant. The sewerage system shall comprise of elements of a given specification for sewer mains, cleanouts, manholes, vents, pump stations, outfall pipeline and diffuser that will ensure a 30 year design flow. Key impacts, mitigation measures and alternatives Impacts on the environment from various activities of the project development work (constructional impacts) and operational impacts have been identified through interviews with the project management team, field data collection and surveys and are also based on past experience of consultant in similar projects. Impacts were analysed for their significance with the aid of a Leopold Matrix. In any development project, major direct impacts to the environment occur mainly during the construction phase. Potential direct or indirect impacts on the environment from the proposed project include: Major significant impacts to the groundwater resource during trenching works; Physical damage to live coral due to trampling during pipe laying works; Impact due to air and noise pollution during construction work; Impact on marine environment due to wastewater discharge; and Positive impact on social wellbeing and health Mitigation measures are discussed for the activities which would have potential impacts during the construction and operational phase of the project. In general, during the construction stage it is important to use a method of construction which has the least impact on the environment. Specific xi measures highlighted include following of established guidelines when carrying out excavation works and dewatering. Detailed mitigation measures are discussed in Section 11 of the report. Alternatives have been considered for various components of the project and are given as possible options that may be either more practical or less expensive to the preferred options. The proposed alternatives also have taken into consideration the environmental consequences resulting from these options as compared to the preferred options. The following components of the project have been discussed in providing these alternatives:- Design of system; Preferred method of STP; and Type of Aerobic treatment plant Outfall location The no-project scenario is also considered, which would mean that all environmental impacts due to the project would no longer be an issue. However, this also means that method of sewage disposal on the island of Thulusdhoo would remain the same, thus leading to further contamination of the groundwater resource of the island. Additionally, it would also mean increased health risks faced by the community due to the use of contaminated water and the loss of potential additional job creation during the operation of the service. The environmental impacts predicted for the project are minor to moderate, hence the benefits of establishing the system, though with a cost to the environment is seen to be far more beneficial than the cancellation of the project, as the health risks faced by the community is not something that should and can be overlooked. Therefore, the “no-project” scenario is not a feasible solution and it is recommended that the project be continued, but with the proper implementation of all mitigation measures proposed in the report. Details of the various alternatives considered and the selected alternatives are shown in Section 10 of the report
Appears in Collections:ތިމާވެށި
Environment A

Files in This Item:
File Description SizeFormat 
Thulusdhoo Sewerage EIA Final report 06022017.pdf10.76 MBAdobe PDFView/Open

Items in Saruna are protected by copyright, with all rights reserved, unless otherwise indicated.