Creasy’s Brook, Dabsongill and Rookfield Spillway Assessment

Creasy’s Brook, Dabsongill and Rookfield Spillway Assessment

Dams are structures of huge engineering feat, they can be used either for water storage or attenuation of flooding. Breaching of these structures can have catastrophic consequences, risking both life and properties in the way of the torrent. Recent events have emphasised the importance to upgrade and maintain high risk dams.

One recent case relates to Oroville’s dam in California. In February 2017 Oroville’s dam failed, risking the lives of more than 180,000 residents. As water flowed over the emergency spillway, headward erosion threatened to undermine and collapse the concrete weir, which could have sent a 30-foot (10 m) wall of water into the Feather River below and flooded communities downstream. A collapse never occurred, but the main spillway suffered significant damage and the bare slope of the emergency spillway were significantly eroded (courtesy of California Department of Water Resources).

At Project Centre, we have a passionate team of engineers who are competent in looking at and analysing the Probable Maximum Flood through structures, modelling in 2D to understand the dynamic of flows, remodelling structures to suit return period and also upgrading and refurbishing these structures to comply with the Reservoir Safety Act 1975. We have been commissioned by Crawley Borough Council to carry out hydrologic and hydraulic assessments of three different spillways and to determine whether the overflow spillway structures satisfy the requirements of the Reservoir Safety Act 1975 (amended by the Flood and Water Management Act 2010). From the findings of these studies, recommendations for remedial and maintenance works will be provided as well as a new spillway design and auxiliary structures where appropriate.