Lock gates
Personnel should not work in the water near a lock gate without first taking control of the gates, unless there is a threat to life. Where possible, an exclusion zone should be established around the lock gates and paddles. Access to the lock should be via the fixed ladder. Mud and silt will be present on the canal bottom and lock walls.
Any attempt to drain the lock should consider the potential of trapping the person. A 50mm gap will create sufficient pressure to pin a person.
Pumping stations
Personnel should not enter the operating areas of the pumping station unless confirmation that isolation has been achieved is received from a responsible person. Any related machinery including weed screen cleaners should be isolated prior to a rescue attempt.
Weirs and sluice gates
Weirs and sluice gates vary greatly in their potential for harm. Personnel should avoid entering these features unless a well-informed risk assessment identifies that it is safe to do so, with appropriate control measures in place.
Isolate water movement and holding systems
Automated water management systems may have on-site isolation switches or control panels. To prevent public access, they are usually in a secure location. Activating these systems may affect hydrology in unexpected ways and the effects will vary with levels and speed of flow. Activation will also affect areas remote from the system, including the potential to cause flooding or damage to vessels located up or downstream. Activation should only ever be considered with the permission and advice of the managing agency.
Personnel should not enter an area where there is a water management system until confirmation has been received of its isolation.
For more information refer to Industry: Isolate power supplies for on-site machinery.
Specialist advice
Water management systems are usually operated by either an environmental agency, canal trust or an internal drainage board. Contact details for engineers and responsible persons for water management systems should be displayed nearby. Fire and rescue services should maintain a record of managers of known water management risks and their contact details as appropriate.
GOV.UK provide information about river level and strong stream warnings for certain areas and rivers. This includes warnings of increased activation of water management systems.