Crantock Rising Main Scheme
Overview
After extensive discussions and evaluations with SWW’s Core Project Team following a design and build approach from cradle to grave, the Crantock scheme transitioned into a traditional open-cut pipeline project. The primary objective was to reroute the existing main away from critical geographical areas, particularly the Gannel Estuary, and redirect the flows directly to Newquay Sewage Treatment Works.
The project scope included approximately 1150 meters of 355mm HPPE rising main, around 2.5 kilometres of 400mm diameter gravity sewer, and 600 meters of syphon sewer. Extensive coordination efforts were undertaken, involving landowners, Parish Councils, Local Highways, and SWW Operations.
To ensure an optimal pipeline route, the project sought to minimize disruptions to key ecological areas and the public while maintaining a practical and cost-effective design that met the required specifications. Glanville employed their expertise in geospatial analysis, conducting an in-depth in-house topographical survey of the proposed route. Ecological surveys were also conducted to identify potential obstacles and gain an overview of the project’s environmental impact. The nine road crossings became critical milestones in the project’s timeline, requiring meticulous coordination between landowners, land agents, local councils, and businesses to ensure minimal disruption and efficient execution.
Pipelaying works concluded in July 2022, followed by the commissioning of the rising main with new pumps. The site was then reinstated and demobilised.
Scheme
Crantock Rising Main Scheme
Client
South West Water
Project objective
Re-route 1.1km of rising main, 2.5km of gravity sewer & 600m of syphon sewer
Scheme value
£2,199,612
Divisions
Civils
Delivery
Concept
The primary objective was to reroute the existing main away from critical geographical areas, particularly the Gannel Estuary, and redirect the flows directly to Newquay Sewage Treatment Works. The project scope included approximately 1150 meters of 355mm HPPE rising main, around 2.5 kilometers of 400mm diameter gravity sewer, and 600 meters of syphon sewer.
Preparation
Glanville employed their expertise in Geospatial analysis, conducting an in-depth in-house topographical survey of the proposed route. Ecological surveys were also conducted to identify potential obstacles and gain an overview of the project’s environmental impact.
Installation
Upon completion of pre-construction surveys throughout 2021, construction began in October 2021 with working completed, pump commissioned and the site reinstated in July 2022.
The benefit
Sustainability
Throughout the nine months of construction, every effort was made in planning and ordering to ensure materials were sourced sustainably and work was conducted in a sustainable way.
Social impact
Completion of this scheme has eradicated pollution events in the area, providing a safer environment for local residents in the Crantock and surrounding area of Newquay.
Cost efficient
Focus during the planning stages ensured the re-route was cost effective while providing the required output.
Longevity
The new Rising Main has provided a solid solution, ensuring longevity of the pipe.
Health & Safety
Appropriate traffic management was in place across the route and despite opting for a traditional open cut method, the health and safety on site remained at high standards ensuring the safety of employees and the public.