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Pendle Water Flood Alleviation Scheme

Lomeshaye & Barrowford, UK

Project outline

Pendle Water and its associated tributaries drain an area of approximately 103 square kilometres. The upper reaches of the catchment are primarily rural and the lower portion incorporates the towns of Colne and Nelson. Flooding has occurred on 18 occasions in the last 130 years. Faber Maunsell were appointed in 1994 to review the outline options proposed at the time and progress the detailed design and contract administration of the works. The scheme was divided into 3 phases as follows:

Phase 1: Lomeshaye
In 1979 Pendle Borough Council re-aligned the course of the river in order to allow development of an industrial estate. The ground was weak and the new channel had progressively slipped causing a restriction of the channel which had significantly increased the risk of flooding. Faber Maunsell proposed works involving channel re-sectioning and scour protection in very unstable ground conditions, new flood walls and embankments and associated accommodation works.

Phase 2A: Holmefield Mill Area, Barrowford
The complexities of the watercourse in this area first required the construction of a physical model to establish the benefits of improvement options on flood flows. The phase then involved urgent works due to the failure of existing channel walls at Holmefield Mill and the consequent partial blockage of the river. The scheme involved new sheet piled channel walls, scour protection, bank stability and enabling building works

Phase 2B: Nelson & Colne College Area, Barrowford
The final phase involved removal of a weir, channel bed regrading, sheet piled floodwalls, culvert improvements and scour protection works.

Key features

Physical scale model to consider complex hydraulic characteristics
River training and flood walls
Channel re-sectioning
Scour protection and bank stability works
Culvert improvements
Weir removal and bed regarding
Bridge protection
Enabling building works
Use of ECC, Options A & C

Appointment

Hydrological and hydraulic analysis
Geotechnical investigations
Option identification and evaluation
Economic analysis
Environmental assessment
Public display
Detailed design
Contract document preparation
Planning supervisor role
Site supervision