Anlaby Flood Alleviation Scheme
UK Projects
Hull
Overview
The award winning Anlaby and East Ella Flood Alleviation Scheme (AEEFAS) was developed by East Riding of Yorkshire Council in partnership with Hull City Council and the Environment Agency as part of a suite of schemes that will reduce flood risk in the Hull and Haltemprice areas that suffered devastating floods that affected hundreds of homes and businesses in 2007.
With the lagoon categorised as a reservoir, the design and construction was subject to the review and approval of a client-appointed Reservoir Panel Engineer. All elements were built to a strict specification and assurance regime.
£3.8m
Phase 2 Project Value
130,000m3
Flood Lagoon Capacity
Challenges
- Construction of a new 130,000m3 flood water storage lagoon
- Construction of new outfall structure and connections
- Construction of an 800m long flood water channel
- Agricultural access bridge across new flood water channel
- Alterations to an existing flood water storage lagoon
- Sports pitch drainage and landscaping to Sport England standards
- Associated fencing, maintenance tracks and landscaping
Solutions
- Embankments constructed using site-won cohesive clay material, forming a natural lagoon liner
- Excavation and re-use of approximately 60,000m3 of soil and supplemented by the import of a further 50,000m3
- 190m long spillway on one side of the lagoon, which is 500mm lower than the surrounding embankments
- Construction of an in-situ reinforced concrete outfall structure as the main control for discharging flows from the lagoon into the existing Acres Head Drain
- A field bridge was built across the newly formed watercourse to provide farmer’s access
- The 90,000m2 lagoon bed had sports pitch drainage incorporated into the design, so the majority of the time it can be used by the local community for sports
Anlaby Case Study V3