Kingstown Port Modernization—Working around a Crumbling Sewer Outfall
Publication: Pipelines 2024
ABSTRACT
As part of the Kingston Port Modernization Design–Build Project located in area in the Bay of Kingstown on the southwest coast of the Island of St. Vincent in the Grenadines, an existing sewer outfall pipeline belonging to Central Water and Sewage Authority (CWSA) had to be decommissioned and replaced with a new sewer pipeline routed on land and offshore. The existing sewer outfall is the only wastewater effluent disposal line for the Kingston District; therefore, interruption of the service had to be kept to a minimum. To address the challenges of installing a new outfall pipe in the marine environment, the design included a new High Density Polyethylene (HDPE) pipe, hydrodynamic modeling for diffuser location, Air Release Valves (ARVs) along the new outfall, and articulated concrete mattress for stability against wave attack in the surf zone. The final design and construction resulted in a successful outfall project able to function in a marine environment.
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REFERENCES
AECON 2022 survey at the Kingstown sewage pumping station indicating top of concrete at the wet well is 2.75 meters above chart datum (CD).
American Concrete Institute. Building Code Requirements for Structural Concrete and Commentary, ACI Code-318-19.
Annex 3 – Design Criteria for the Kingstown Port Modernization Works, not dated.
Annex 5 – Sewer Line Relocation Report (Sewer Line Relocation Report) prepared by Sellhorn Ingenieurgesellschaft mbH (Sellhorn) / HPC Hamburg Port Consulting GmbH (HPC), not dated.
Articulated Concrete Mattress for Submarine Pipeline Protection Evaluation of the Wave-induced Forces and Stability Analysis.
BC Ministry of Environment. 2013. Guidance for the Derivation and Application of Water Quality Objectives in British Columbia, Canada.
DNV RP-E305, Design, testing and analysis of offshore fibre ropes, Latest Edition.
International Electrotechnical Commission. Rotating electrical machines - Part 30-1: Efficiency classes of line operated AC motors (IE code), IEC 60034-30-1:2014.
International Finance Corporation. World Bank Group, April 30, 2007. Environmental, Health, and Safety (EHS) Guidelines WASTEWATER AND AMBIENT WATER QUALITY.
Polyethylene Piping Systems Field Manual for Municipal Water Applications, M&I Division, 2009.
Handbook of Polyethylene Pipe - Chapter 10 - Marine Installations, 2008.
Pilarczyk, K. W. 1995. Design of Dikes and Revetments – Dutch Practice.
Pilarczyk, K. W. 2003. Design of Revetments.
Sellhorn and HPC. 2019. Chapter 12 – Wave and Storm Surge Modelling, Port Modernization Project Feasibility Report, Kingstown Saint Vincent.
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Published online: Aug 30, 2024
ASCE Technical Topics:
- Coasts, oceans, ports, and waterways engineering
- Concrete pipes
- Construction engineering
- Construction management
- Environmental engineering
- Hydraulic engineering
- Hydraulic structures
- Infrastructure
- Lifeline systems
- Ocean engineering
- Offshore pipelines
- Offshore structures
- Pipeline systems
- Pipelines
- Pipes
- Ports and harbors
- Project management
- Sewer pipes
- Sewers
- Steel pipes
- Structural engineering
- Structures (by type)
- Wastewater management
- Water and water resources
- Water treatment
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