Slowing Water Through Landscapes
Nature-Based Solutions manage flood risk by changing how rainfall moves through landscapes. Natural structures can temporarily retain water and reduce rapid downstream flows during heavy rainfall. Leaky dams use materials such as logs and branches while allowing water to pass gradually. This mechanism combines water management with existing landscape processes rather than relying solely on conventional flood infrastructure.
Targeting Flood Management Measures
Effective NBS depend on selecting locations where interventions can meaningfully influence water movement. Hydrological modeling can show how rainfall travels through streams, ditches, soils, and connected drainage pathways. This information helps practitioners identify points where slowing water can reduce downstream peak flows. Targeted placement therefore links landscape interventions with measurable flood-management objectives and efficient use of available materials.
Connecting Flood Resilience with Ecosystems
Natural flood management can support ecological functions while reducing risks to communities. Retaining water within landscapes can increase soil moisture and strengthen vegetation resilience during dry periods. Slower flows can also reduce erosion and trap sediment before it moves downstream. These processes can improve water quality, soil stability, habitat conditions, and landscape resilience through one coordinated management approach.
Integrating Nature-Based Solutions into Governance
Large-scale NBS require coordination between land managers, flood authorities, environmental bodies, technical specialists, communities, and funding organizations. Public funding can support construction while climate programs can connect flood management with wider resilience objectives. Environmental review can ensure interventions remain compatible with protected habitats and conservation requirements. Monitoring can then track soil moisture, water conditions, and vegetation health to assess performance over time.
Nature-Based Solutions also benefit from implementation methods that connect technical design with routine land management. Locally generated natural materials can reduce waste when appropriate habitat-management residues are reused for flood interventions. Volunteers can support construction and maintenance under coordinated project management. This combined approach links hydrological evidence, ecological management, institutional oversight, and community participation within a practical framework for climate resilience.
Case Study: Epping Forest Leaky Dams Project
The Epping Forest Leaky Dams project is installing 374 purposefully designed structures across streams and ditches in Epping Forest. The scheme aims to reduce flood risk for more than 500 homes. Hydrological modelling identified locations where slowing rainfall runoff should have the greatest downstream impact. Once completed, the structures are forecast to retain approximately 10,000 cubic meters of additional water.
The project uses logs and branches, with most materials sourced directly from Epping Forest. Timber from routine habitat management and habitat restoration is reused for construction. These activities include planned thinning and pollarding to restore wood-pasture habitats and maintain tree health. Monitoring will assess soil moisture, water levels inside trees, and canopy health using satellite imagery.
The Thames Regional Flood and Coastal Committee provide £200,000 through its Natural Flood Management program. The City of London Corporation contributes another £150,000 through its Climate Action Strategy funds. Essex County Council serves as lead local flood authority and grant applicant, overseeing governance, procurement, and delivery. City Corporation teams provide project management, ecological planning, technical leadership, and Geographic Information System (GIS) mapping.
Environmental safeguards reflect Epping Forest’s protected status as a Site of Special Scientific Interest and Special Area of Conservation. Natural England provided SSSI consent and reviewed and approved the City Corporation’s Habitat Regulations Assessment screening. Local authorities also provided planning input, environmental oversight, volunteer support, and community engagement. Volunteers assist with dam construction and maintenance.
The project combines regulatory review, technical modeling, public funding, habitat management, and institutional coordination. Its intended outcomes include slower peak flows, reduced erosion, improved soil stability, and wetter habitat conditions. Retaining soil moisture is also expected to support tree health during dry weather. These mechanisms connect local flood management with broader climate resilience and sustainability objectives.
Conclusion
Nature-based flood management can connect hydrological risk reduction with habitat management, water quality, and landscape resilience. Coordinated policy, technical design, environmental oversight, and monitoring can support wider climate action through practical landscape-scale interventions.
