| Construction of three new flood embankments, top up existing flood defenses and construct new intertidal habitat area. Secondary works included improvement of existing outfall, new culvert and ditch works and additional drainage.
The initial design proposal was to introduce cement to stabilise existing material on site to meet the required strengths. Due to time and budget constraints this could not be sufficiently challenged before the initial start date of Sept 2019 and so work commenced as planned only to be stopped during the wettest October in local memory. The stoppage did however provide the opportunity to reconsider the geotechnical design of the flood bunds with their heavy carbon footprint and associated cost. A risk based approach was used to manage a new design. The methodology required a significant amount of low cost and rapid, in-situ soil testing to establish soil types on site. A soil management plan was devised with the design cycle being closed by a daily testing regime. The new design negated the need for cement introduction all together providing a significant environmental benefit to the project. |
Works included:
Phase II saw a breach created within the flood defense to complete the intertidal habitat. |