KGAL Fluid January 2024 - Flipbook - Page 5
consulting engineers
Current radial gate installation
Model view
Leigh Expansion and Hildenborough
Embankment Scheme (LEHES)
We are carrying out vital flood defence works on behalf of the Environment
Agency on the Leigh Flood Storage Area (FSA) control structure situated
on the River Medway in Kent.
The control structure, which consists of a central radial gate, two identical side radial gates and a small penstock, helps to
manage river levels in high flow to reduce the impact of flooding for homes and businesses in the Hildenborough and Tonbridge
area. It impounds water in an upstream storage area during periods of peak flow and provides a controlled release of the water
when conditions are suitable, or when the upstream storage capacity is reached. This work will replace the three radial gates and
the three drives operating the gates, with three new radial gates and three new rope winch systems.
The project is progressing well and has evolved from its original objectives, which involved replacing the lead screw drive
mechanism with a winch drive while also increasing the impound height, which required modification to the three original radial
gates. The scope now involves replacing all three radial gates with new fabrications in order to meet the programme delivery.
The gate and winch design has been completed, Factory Acceptance Testing (FAT) has been undertaken, and fabrication is well
underway. Further design scope has been added for a moving platform, which enables improved access for winch equipment
inspection and maintenance requirements.
Installation of the South Gate is due to start in Q2 2024. The programme target is to replace all three gates before winter 2025.
View during Renold FAT Test
Gwasted Bridge
KGAL has been appointed by Cass Hayward to design the electrical and mechanical aspects of a
new movable bascule bridge to be built across the Monmouthshire & Brecon Canal, next to an
existing fixed masonry arch bridge adjacent to Lock No.2, near Malpas in South Wales.
The “Mon and Brec”, as it is fondly known, is a very picturesque canal
originally connecting the county town of Brecon with the port of Newport.
The southern portion is not currently navigable and this new bridge will be
an important step in reopening the canal along its entire length.
The lifting bridge structure, comprising a 3m wide x 8.5m deck and a
counterweight arm, was designed by Cass Hayward. The lifting principle
will utilise a small electrically powered winch and wire ropes.
Design drawing of the new Gwasted Bridge