Client: Middlesbrough Council
Location: Saltersgill Estate, Middlesbrough
Working with Middlesbrough Council, Lynas Engineers developed a comprehensive flood defence scheme, split into 2 phases, to ensure the protection of 306 properties on the Saltersgill Estate, Middlesbrough. Through the design and construction of the proposed flood defence systems, the 306 homes were taken from a significant risk zone into a low risk zone. The works have been designed to protect homes from internal flooding for events up to a critical 1 in 200 year storm.
Phase 1 of the scheme includes two dry basins and one wet pond, all connected, to provide 12,000m³ (12 million litres) of storage during a critical storm. Phase 2 of the scheme includes the installation of a flood defence bund with a capacity of almost 24,000m³ (24 million litres) of water during the same critical storm. The maximum combined flow rate from the two phases equates to 862l/s.
Lynas Engineers was commissioned to design and enable the hydraulic and flood modelling studies by Middlesbrough Council; in order to facilitate the construction of the proposed flood protection works. Specialist design software including AutoCAD Civil 3D and MicroDrainage was utilised to ensure the proposed methods of storage protection were robust enough to withstand the critical storms and could be constructed in a real-world environment. Lynas Engineers was also involved in the procurement of the works and undertook the role of client representative, providing site support and supervision, throughout the duration of the works. We also acted as Principal Designer under CDM.
The area was prone to flooding which caused great concern for residents living in the area.
The scheme was required to consider an area of 37 hectares.
Heavy rainfall during the construction period.
Restrictions due to the COVID 19 pandemic.
Successes:
A fully designed civil engineering package including approval of plans from appropriate authorities.
Residents can rest assured that both their properties and their personal wellbeing is protected.
Value engineering of the first phase led to savings which allowed early construction of Phase 2 works.
Value engineering and cost management during the Phase 1 design period allowed the Phase 2 works to be brought forward. The delivery of both phases in parallel meant that export of material offsite was minimised by re-rising site won material n the earth bund; this led to significant cost and carbon savings.
