Topographically-based catchment delineations cover all stream-reach segments of the National Hydrography Dataset across the conterminous United States. The dataset was produced by the USGS in cooperation with the USEPA and was intended for release as part of the NHDPlus project in 2006.
Use Cases
- Model water-quality parameters using catchment boundaries derived from the NHD stream-reach network.
- Analyze stream-flow contributions from specific catchments delineated for NHD segments.
- Assess land-use impacts on water resources by linking catchment areas to upstream pollutant sources.
- Support watershed management planning with spatially accurate catchment polygons for the conterminous US.
Strengths
- Catchments are delineated for all stream-reach segments within the conterminous United States.
- The delineation technique is based on a proven method used in the New England SPARROW model.
Limitations
- The dataset's temporal coverage is unclear, with a planned release date of 2006 suggesting potential staleness.
- Specific details on row count, column attributes, and spatial resolution are unknown.
- The dataset's availability and final completion status are not confirmed in the description.
Provenance
- Source
- USGS and U.S. Environmental Protection Agency (USEPA)
- Collection Method
- Topographically-based catchment delineation using the National Hydrography Dataset stream-reach network.
- Time Range
- null
- Freshness
- null
- Geography
- Conterminous United States