We strive to carryout our operations safelycompetently and sensitively. We undertake planned maintenance and capital work, using a healthy mix of in-house resource, expertise from other Risk Management Authorities, consultants and contractors. We’re also able to undertake rechargeable work on behalf of riparian owners, Flood and Coastal Erosion Risk Management Authorities and other third parties, and, we’re able to respond to emergency situations and other events as and when they arise, which all helps keep Norfolk Rivers Internal Drainage District safe:

Planned Maintenance work
Balancing Flood and Coastal Erosion Risk Management with the Environment
Planned Capital work
Inspection of the Drainage Infrastructure
Rechargeable work
Emergencies and Incident Response
Other work

Planned Maintenance work

The Board undertakes a number of routine maintenance operations periodically. Principle operations include:

  • Servicing and repairing water level control structures
  • Weed cutting
  • De-silting
  • Bushing and tree coppicing
  • Mowing and control of bankside vegetation

The Board also undertakes other planned maintenance operations such as slip repairs, pipeline inspections, culvert cleansing, repairs and renewals. Please check out our Work Programmes webpage for a comprehensive list of planned maintenance works.

Balancing Flood and Coastal Erosion Risk Management with the Environment

We recognise that our watercourses and coastal defences are not just Engineering Structures but are also Wildlife Corridors. As such we seek to ensure that important wildlife and their habitats are not endangered by our operations, or during periods of flooding or drought. The Board’s Biodiversity Action Plan, Biosecurity and Standard Maintenance Operations (SMO) policy documents clearly set out how we intend to achieve this.

The SMO policy document has been based on the Drainage Channel Biodiversity Manual produced by ADA and Natural England in 2008, and, has since been reviewed to take account of the Water Framework Directive as set out in the Channel Management Handbook produced by the Environment Agency in 2015. The SMO has been approved by Natural England and is both ISO 9001 and 14001 quality assured. We also seek to reduce our carbon footprint by undertaking work in the most carbon efficient and sustainable manner.

Planned Capital work

The Board has a modest capital works programme and the individual projects are listed each year on our Work Programmes webpage. Types of scheme include:

  • Hydrological Modelling of sub catchments
  • Flood Risk Management Improvement and refurbishment
  • Environmental Improvement
  • Water quality and river-restoration

We may also need to undertake other improvement work to facilitate development as and when required, in accordance with the Board’s Planning and Byelaw Strategy.

Inspection of the Drainage Infrastructure

The condition of our drainage infrastructure is periodically assessed by trained Asset Surveyors to ensure that it remains fit for purpose and meets today’s health and safety requirements. The results of our visual asset inspections inform the planned maintenance and capital works programmes for future years.

Much of our Drainage Infrastructure is at the end of its economic life and needs replacing or extensively refurbishing. Whilst the necessary improvements are now scheduled in the capital programme, if the infrastructure fails before we can do the work, we must be able to respond immediately and make the necessary repairs.

Rechargeable work

We’re able to undertake rechargeable work on behalf of riparian owners, flood and coastal erosion risk management authorities and other third parties. We’re also able to undertake out of hours emergency work and have access to a robust and experienced team to implement a variety of emergency flood, drainage and civil engineering response tasks.

Whilst our hourly charge-out rates are competitive they may not always be the lowest. However our price for doing the job is still likely to be competitive because we’re able to complete the work more quickly than most, with minimal supervision, and, without causing any damage on-site. This is achieved by only ever using experienced operatives and having access to robust technical support and the most appropriate equipment for doing the job.

If you would like us to quote for some work please contact either the Area Manager or any one of our Technical Support team, who will be pleased to give you a fixed price for the job.

Emergencies and Incident Response

We respond to emergencies during periods of high rainfall and during tidal surge events, utilising our workforce, Board membership and state of the art telemetry system. We work closely with other operating authorities and have detailed how we shall respond in an emergency situation on our Emergencies webpage.

The Board is also committed to working closely with others to more effectively manage the issue of non-native invasive species:


We have to contend with an increasing amount of fly-tipping, which is blighting our landscape, costly to manage and bad for the natural environment. We are working with the Councils and the Environment Agency to collectively help tackle the problem, in accordance with our Fly Tipping Policy.

A tracked excavator uses its hydraulic arm to carry out dredging of the River Mermaid, a sight no longer seen on this stretch of water - now the focus has moved to improve habitats for plants, invertebrates and fish   A tractor travels along a drainside road using its outreached hydraulic arm to carry out routine weed cutting and flailing of the drain’s bank sides   A man fly-fishing in the calm waters of a shallow river, surrounded by overhanging vegetation and countryside views beyond   A member of the Water Management Alliance’s Environmental Team surveying a Weed Screen   Television crew interviewing a resident outside a flooded Public House, seen in York, Yorkshire   Fly tipped tyres in a drainage ditch

Contact details

During office hours
(between 8.30 am and 4.30 pm)
Tel: +44(0)1553 819600
Email: info@wlma.org.uk

Central Office: Pierpoint House, 28 Horsley’s Fields
King's Lynn, Norfolk, PE30 5DD

Out of hours

Please contact the Duty Officer on +44(0)7841 571251 or send an email to dutyofficer@wlma.org.uk. Otherwise if you know who you need to contact in an emergency, please refer to the Member Board’s ‘Contact us’ webpage on this site for their out of hours contact details.

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