Guide
Appoint a supervising or inspecting engineer for a reservoir
How reservoir undertakers in the UK choose the right Defra panel and appoint a construction, supervising, or inspecting engineer to meet their duties under the Reservoirs Act 1975 and devolved legislation.
When you need to appoint a panel engineer
If you are the undertaker for a large raised reservoir in England or Wales, or a high-risk reservoir in Scotland or Northern Ireland, you must appoint qualified engineers from the relevant Defra-maintained panel. You appoint engineers at three points in the life of a reservoir: when you build or alter it, to supervise it day to day, and to carry out the periodic statutory inspection.
If the enforcement authority serves you with a notice because you have no engineer in place, you have 28 days to make the appointment. Missing this deadline is a criminal offence under section 22 of the Reservoirs Act 1975.
The three engineer categories
Reservoir legislation recognises three distinct engineer roles. You may need one, two, or all three at different points, and you cannot appoint the same person to act in two roles for the same reservoir at the same time.
- Construction engineer - Designs and supervises the construction, alteration, or enlargement of a reservoir. Issues preliminary and final certificates. Required only during construction or major works.
- Supervising engineer - Provides continuous oversight once the reservoir is in service. Visits the reservoir, reviews records, advises on maintenance, and produces an annual statement. Must be in place at all times for a high-risk reservoir.
- Inspecting engineer - Carries out the formal 10-yearly statutory inspection. Specifies safety measures and deadlines. Appointed for the inspection itself; you do not need a permanent inspecting engineer.
Appointments are personal to the named engineer, not to their firm. If your supervising engineer leaves their employer or retires from the panel, you must appoint a replacement.
Choosing the correct Defra panel
The Institution of Civil Engineers (ICE) maintains three separate reservoir engineer panels on behalf of Defra. The panel an engineer sits on determines which reservoirs they are qualified to work on. Pick from the panel that matches your reservoir type:
- All Reservoirs Panel (AR) - Engineers qualified for any large raised reservoir, including impounding reservoirs (those that hold back a watercourse, such as upland dams). Use this panel if you are unsure of your reservoir type, or if your reservoir impounds a river or stream.
- Non-Impounding Reservoirs Panel (NIR) - Engineers qualified for raised reservoirs that do not hold back a watercourse, such as pumped-storage irrigation reservoirs and farm flood-storage ponds filled from a borehole or mains.
- Service Reservoirs Panel (SR) - Engineers qualified for covered service reservoirs used in public water supply, typically operated by water companies.
An All Reservoirs Panel engineer can act on any reservoir. A Non-Impounding or Service Reservoirs Panel engineer can only act on reservoirs of their specific type. Check the published panel lists on GOV.UK before approaching an engineer.
How to appoint your engineer
Follow these steps to make a valid appointment:
-
1. Identify which engineer you need
Decide whether you need a construction, supervising, or inspecting engineer based on your stage of works and existing appointments.
-
2. Select the right panel
Match your reservoir type (impounding, non-impounding, or service) to the All Reservoirs, Non-Impounding, or Service Reservoirs panel.
-
3. Find a qualified engineer
Use the Defra panel lists published on GOV.UK, the British Dam Society directory, or specialist reservoir engineering consultancies. Confirm the engineer is currently on the panel and has capacity.
-
4. Agree terms and scope
Engage the engineer in writing, setting out the scope (supervision, inspection, or construction), fees, access arrangements, and reporting deadlines.
-
5. Notify the enforcement authority
Tell the Environment Agency, Natural Resources Wales, SEPA, or DfI in writing of the appointment. Include the engineer's name, panel category, and the date the appointment takes effect.
-
6. Update your records
Record the appointment in your reservoir log alongside previous certificates, supervising engineer statements, and inspection reports.
If the authority directs you to appoint within 28 days
If you fail to keep a supervising engineer in post, or do not commission a 10-year inspection on time, the enforcement authority can serve a notice requiring you to appoint a panel engineer within 28 days.
When you receive a notice:
- Read it carefully to confirm which engineer category is required and the deadline given.
- Approach engineers immediately - panel members are in limited supply and may not have capacity at short notice.
- Make the appointment in writing and notify the authority before the 28 days expire.
- If you genuinely cannot find an engineer in time, contact the authority before the deadline to explain. They may extend the period or, in default, appoint an engineer themselves and recover the cost from you.
The authority can also appoint an engineer in default if it considers there is an immediate safety risk. You will be liable for the engineer's fees.
Failure to appoint a panel engineer
<p>In Scotland, SEPA can use civil sanctions under the Reservoirs (Scotland) Act 2011 in addition to or instead of prosecution, including variable monetary penalties and enforcement undertakings. In Northern Ireland, DfI enforces equivalent offences under the Reservoirs Act (Northern Ireland) 2015.</p>