Little Ellingham S101A First Time Sewerage Scheme

Sweco, as part of the @One Alliance team, managed the feasibility study and detailed design for the first-time sewerage project at Little Ellingham.

KEY FACTS

Client: Anglian Water

Location: Little Ellingham

Date: 2016 - 2017

Value: £2.1 million 

 

BACKGROUND

Little Ellingham is a relatively large village split in two discrete areas in the county of Norfolk, approximately 3 miles South East of Attleborough. The village contains 66 properties, served by septic tanks for treatment of foul drainage. Depending upon size and location, these septic tanks functioned with varying degrees of efficiency. Many were not maintained and discharged directly into water courses flowing through the village. The village had a high-water table and the nature of the soil made soakaways ineffective.

PROJECT DESCRIPTION

The project included the provision of a new public sewer network for 66 properties within the village of Little Ellingham. The design scope included 1.4km of gravity sewers, 3.1km of rising mains, and two pumping stations.

Primary services:

• Feasibility Study
• Optioneering
• Outline Design
• Detailed Design
• Geotechnical Investigations
• Environmental Surveys
• Environmental permit applications
• Planning permission / permitted development submissions
• Flood risk assessments
• Landowner Consultation
• Stakeholder Management
• Hydraulic Analysis
• Civil & Structural Engineering Design
• MEICA Design
• Construction Phase Support

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SOLUTION

The final solution comprised of two separate gravity collection systems (total length: 1.4km) with two submersible pumping stations discharging via two separate rising mains (total length: 3.1km) into the existing Great Ellingham network delivered in AMP5.

The pumping stations were a subject to a full planning application, which involved an environmental screening opinion, ecological and archaeological studies.

The scheme required several consents from LLFA and highway due to number of ditch crossings, pumping station locations and road closures.

The key to the project success was to work closely with all internal and external stakeholders to define the solution during risk and value intervention process. The solution, completed on time, provided a £1.7m saving against AW’s business plan.

The final solution outperformed the client’s embodied carbon reduction of 56.7% against baseline (from 697 tCO2 to 299.57tCO2) and operational carbon reduction of 63.6% (from 14 TCO2/pa to 5.1tCO2/pa).

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