The Anlaby and East Ella Flood Alleviation Scheme (AEEFAS) and Cottingham and Orchard Park Flood Alleviation Scheme (COPFAS) have officially opened at a combined cost of over £40 million. Together these multi-award winning schemes will reduce the risk of flooding to over 8000 properties.
In combination with the £14 million Willerby and Derringham Flood Alleviation Scheme (WADFAS), in 2016, the schemes reduce the risk of surface water flooding to over 14,000 properties in the Hull and Haltemprice area. The projects delivered by East Riding of Yorkshire Council (ERYC) in partnership with the Environment Agency and Hull City Council are amongst the largest flood alleviation schemes of their kind in the country and have gained prestigious awards and commendation from industry bodies.
AEEFAS is funded through £16m Flood Defence Grant in Aid (FDGiA) administered by the Environment Agency, and £5.1m from the Governments Local Growth Fund (LGF) secured by the Humber LEP as part of the Government's commitment to the Northern Powerhouse. COPFAS was funded through £14m FDGiA and £5m Local Growth Fund, secured by the Humber LEP and part of the Government's commitment to the Northern Powerhouse, as well as a £0.9m land contribution from Hull City Council.
Following significant flooding in 2007, the council embarked on a series of detailed flood modelling studies across the East Riding. A hydraulic modelling study was completed for the Hull and Haltemprice area to establish the key flood mechanisms and identify a solution in the form of a suite of major flood alleviation schemes.
AEEFAS has been delivered in three phases and includes a new flood storage lagoon capable of storing up to 115,000 cubic metres of water constructed on the site of the former Sydney Smith School. Flood water is diverted away from residential areas in the West Ella Valley and into the lagoon through a series of newly constructed interconnected watercourses, upgraded culverts and a stormwater tunnel. This 1.5km long tunnel was constructed using two 17-tonne tunnel-boring machines. The scheme also utilises an existing storage lagoon alongside Beverley Road to provide additional floodwater storage.
Phase 1 works were undertaken by principal contractor PBS Construction. Phase 2 works were taken on by principal contractor Colas-SIAC Ltd and sub-contractor Humberside Excavations. Phase 3 works were carried out by principal contractor NMCM Plc and sub-contractors Active Tunnelling Limited.
COPFAS is split into two phases. Phase 1 consists of a of a large floodwater lagoon constructed in the Orchard Park area. The lagoon temporarily stores water diverted away from residential property through a series of flow control structures and a 500m long siphon. A new fishing pond and wildlife area has been created as part of the scheme to enhance the amenity value of the neighbourhood. Phase 1 works were completed by contractor Jacksons Civil Engineering.
Phase 2 consists of a series of 9 interlinked flood storage lagoons along Westfield Road and Eppleworth Road in the Raywell Valley, Cottingham. Together both phases of COPFAS have the capacity to store over 330,000 cubic metres of floodwater. Phase 2 works were completed by principal contractor Esh Construction.
The storage areas will be dry for the majority of the time, only filling during times of extreme wet weather. This allows for multi-purpose amenity use in the form of sports pitches in the case of the lagoon constructed on the former Sydney Smith School site. Other lagoons will remain as agricultural land. Both schemes have already operated as designed over the winter of 2019/20 and again during Storm Christoph earlier this year, to reduce flood risk to thousands of residents in the Hull and Haltemprice area.
Councillor Chris Matthews, East Riding of Yorkshire Council's portfolio holder for strategic property and infrastructure, said: "It's a real credit to the council's staff and our partners that these two award-winning flood defence schemes are operational.
"We understand how much flooding can have devastating impacts on our communities so schemes such as COPFAS and AEEFAS are essential to reduce the consequences of future flooding in the East Riding."
Stephen Parnaby OBE, Chair of the Humber LEP, said: "We're extremely pleased work has been completed on these two important flood defence projects, which the Humber LEP supported through the Local Growth Fund.
"Communities across the Humber continue to be affected by flooding and we are very glad to see both flood alleviation schemes completed and begin to help protect residents and businesses across Hull and East Yorkshire."
Dean Hamblin, Environment Agency senior flood advisor, said: "It's fantastic to see these two award-winning flood alleviation schemes completed. East Riding has done a superb job developing these three innovative flood storage schemes, better protecting thousands of homes from flooding and making the area more resilient to climate change.
"Flood storage areas are a key defence against flooding in Yorkshire and worked to great effect during Storm Christoph in February where they helped reduce the impact of flooding to thousands of people by storing floodwater and slowing the flow through towns and villages. They also provide vital habitats for wildlife, and green spaces for communities to enjoy.
"The schemes form a key part of the £200 million package of work being delivered in in East Yorkshire and Hull to reduce the risk of flooding to more than 50,000 homes and businesses."