Value: £200,000

Diglis Locks are located on the River Severn and are susceptible to inundations in times of localised rainfall or sustained heavy rainfall in Mid Wales, with the locks being controlled by automatic sluices operated by the lock keeper.


Diglis Locks are located on the River Severn and are susceptible to inundations in times of localised rainfall or sustained heavy rainfall in Mid Wales, with the locks being controlled by automatic sluices operated by the lock keeper.

Following an initial inspection of the gates at Diglis Lock, it was noted that a timber patch repair was required, and to be carried out by divers on the west leaf of the upper gates to the small lock.

The works included the installation of an 8’ x 4’ sheet of marine grade ply to the pressure side of the gate by drilling and fixing the sheet to the timbers of the gate. The purpose of the Diglis Lock Stoppage pre-investigations was to allow British Waterways to gather necessary information to allow the dewatering of the river locks. The Remedial and preparatory works were required prior to the lock closure; this was identified during the pre-investigation survey.

The dive site at Diglis Lock, consisted of two separate lock pits; the big lock and the small lock, which are separated by a manmade island on which the control building for the operation of the lock systems is located. Water flow could be controlled through culverts beneath the island which enters at an inlet upstream of the locks at the central bullnose of the island. The culvert bifurcates into two culverts which services the lock pits. At the downstream end, the culverts rejoin into one and then discharge through an outlet in the island bullnose.

In order to proceed with the repair works, the small lock was flooded to the same level as the upstream River Severn. Upstream Sluices were then opened and the east upper gate leaf placed into the recess. Kaymac’s diving supervisor proceeded to ensure that all lock machinery and equipment was positioned to allow safe diving in the required areas which upon completion the diver entered the water and descended into position on the pressure side of the gate.

The timber sheet was lowered down to the diver with suitable weights attached where they made final adjustments to the position of the sheet.  Then using the pneumatic drill, the diver proceeded to drill holes through the sheet into the timber of the gate and install with the fixings supplied and tightened them to complete the work.


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