Lower Bann Network Contribution: High-Risk Areas for Surface Water Flow

Network contribution area scores for the Lower Bann region identify land areas most likely to contribute surface flow to the river network. These scores were calculated within SAGA GIS using inputs from the CEH Land Cover 2007 map, Met Office average rainfall data, and a 5-meter Digital Terrain Model. The 'High contribution' category boundary is defined statistically as areas scoring above +1 standard deviation from the mean.

Use Cases

• Identifying high-risk zones for surface runoff and potential flooding based on integrated land cover, rainfall, and topography.
• Visualizing critical contributing areas for catchment management dashboards and web maps.
• Supporting land-use planning decisions by highlighting areas with high hydrological connectivity to the river network.
• Calibrating or validating other hydrological models with pre-calculated contribution scores for the Lower Bann.

Strengths

• Derived from authoritative UK sources: CEH Land Cover 2007, Met Office rainfall, and a 5m DTM.
• Methodology is explicitly described, using a standard statistical threshold (+1 SD) to define high-contribution areas.
• Available under the permissive Open Government Licence (OGL-UK-3.0) for reuse.

Limitations

• Core input land cover data is from 2007, which may not reflect current land use.
• Specific column names, data size, and row counts are not provided in any source, limiting precise technical assessment.
• Metadata for author, exact creation date, and spatial resolution is incomplete or conflicting across listings.

Provenance

Source

Government Digital Service (UK), outputs from the SciMAP application within SAGA GIS.

Collection Method

Geospatial analysis integrating land cover, average rainfall, and elevation data.

Time Range

Based on CEH Land Cover 2007; analysis date is not specified.

Freshness

2026-04-15 14:21:36.975151

Geography

Lower Bann region, Northern Ireland, United Kingdom.