The Department for Infrastructure has published the Living With Water in Derry/Londonderry Plan, a strategic drainage infrastructure framework designed to protect communities, enhance environmental performance and unlock growth. Its three core objectives are:

  • Reduce flood risk across the catchment
  • Improve water quality
  • Address wastewater capacity constraints that are limiting housing and commercial development

Derry/Londonderry ranks second in Northern Ireland for flood risk exposure, with estimated annual damages of £5.56 million. Without intervention, flooding and pollution will intensify, climate pressures will increase and wastewater constraints will continue to restrict development.

The Plan divides the city region into four natural catchments (West Foyle, East Foyle, Faughan and Eglinton) each with defined pressures and opportunity-based solutions, including cross-border considerations given proximity to Donegal. Structural issues are consistent across:

  • Surface, river and tidal flooding
  • Combined sewer overflows
  • Capacity constraints at Culmore Wastewater Treatment Works
  • Sewer networks operating at or above design limiting development restrictions

The proposed response combines blue/green infrastructure (Sustainable Drainage Systems, Natural Flood Management, upland storage, green space attenuation and river restoration) with hard engineering (sewer upgrades, pumping station improvements, storm overflow screening, flood defences and expansion at Culmore). However, the Plan remains strategic. Schemes must progress through appraisal, approval and departmental capital allocation. No ring-fenced funding has been committed.

Wastewater capacity remains the most significant infrastructure constraint on housing delivery, inward investment and City Deal leverage. The Plan provides a credible policy platform for capital prioritisation and coordinated delivery across DfI, NI Water and Council. Its effectiveness will ultimately depend on whether funding follows strategy.

Takeaway:

The strategy is clear, but the critical test is whether sustained capital investment will be secured to remove wastewater constraints and enable growth in North West

Read the full plan here.