Due to to a build up of bed materials and the potential for scour damage during flood conditions the structure required flood elevation works and scour protection.
Guerning Dog Road Bridge is located 0.5 miles west of Todmorden, Calderdale, West Yorkshire, and carries Knowlwood Road at a junction with Rochdale Road over the River Calder. Due to the susceptibility of the River Calder to respond quickly to rainfall and consequently rise in river level, it was imperative that the weather conditions were checked and monitored prior to and during any activities where personnel are working in the watercourse.
To allow semi-dry access below the bridge structure, the river was flumed through two 600mm diameter twin wall pipes each 35m in length. A dam of bulk bags of sand was then constructed upstream and downstream of the bridge to diver the flow through the flume pipes. Once the river flows were diverted, the river bed materials required reducing down to formation level beneath the bridge and for 6m upstream and downstream of the structure to allow placement of the Proserve scour protection Mattresses.
Despite dificult access and unpridictable weather the Proserve scour proection mattereses were successfully installed and the project was completed on time and to budget.