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Anlaby & East Ella Flood Alleviation Scheme (AEEFAS)

  • Client: East Riding of Yorkshire Council
  • Location: Anlaby and Kirk Ella (western suburbs of Hull)
  • Value: £1.257m
  • Period: August 2017 – August 2018

GENERAL OVERVIEW

The works (located in the parishes of Anlaby and Kirk Ella which form part of the western suburbs of Hull) constituted the first phase of the Anlaby & East Ella Flood Alleviation Scheme (AEEFAS) and comprised the following:

  • Replacement of existing structures carrying the Western Drain under the public highway with box culverts at the following locations:
  1. Site A – South Ella Drive
  2. Site B – Woodland Drive
  3. Site C – Tranby Lane
  • The construction of a new culvert to carry a proposed flood alleviation channel under Beverley Road, Anlaby, approximately 50 metres south of the junction with Lowfield Road, referred to as ‘Site D – New Marr Bridge’

The AEEFAS scheme was designed to provide flood protection to approximately 3,500 properties in the area during extreme rainfall events. The existing culverts on the Western Drain watercourse didn’t provide sufficient capacity during such events, thus restricting flow. The replacement of the culverts was designed to address this issue. Further phases of the scheme involved construction of measures to divert flow out of Western Drain. The culvert at New Marr Bridge carries this diverted flow under Beverley Road.

SCOPE DELIVERED

  • Sites A, B & C were delivered in a similar manner; the roads were closed at the junctions, the old culverts were dug out and the new, larger culverts were dropped in using a crane. The new culverts were pre-cast concrete and manufactured specifically for each location and the excavations were supported by sheet piles, carefully placed around the services present. They were delivered one site at a time due to being nearby to each other, taking the road closures into account. The order of work was site A, C, B and then D
  • Due to the depth of the work there was always a huge amount of services present which meant a lot of careful digging around those services and protecting them while they were exposed. When the existing road was excavated for the new culverts, sheet piles had to be installed to support the excavation. These were placed around the services passing through the excavation
  • As well as a new culvert, new headwalls were installed at each end to support the new, larger culvert
  • Replacement/reinstatement of the kerbs at the junction, along with the carriageway tarmac reinstatement and road markings
  • Due to the nature of the works it was very wet which resulted in a lot of water pumping to ensure the works area was cleared
  • Site D (New Marr Bridge) was different from the other three as it was a lot bigger. It was a huge excavation for this area and there were a lot of service diversions works to accommodate the new structure. Parts of this phase were completed while maintaining an open carriageway on Lowfield Road
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