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The National Hydrographic Dataset As the Basis for Idaho ’ s Water Data

The National Hydrographic Dataset As the Basis for Idaho ’ s Water Data. Zach Maillard GIS Analyst Idaho Dept. Of Water Resources. Overview. Acquiring and Processing NHD Incorporating Existing Water Right Data Into NHD NHD Network Analysis Integrating Real Time Stream Gauge Data Into NHD

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The National Hydrographic Dataset As the Basis for Idaho ’ s Water Data

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  1. The National Hydrographic Dataset As the Basis for Idaho’s Water Data Zach Maillard GIS Analyst Idaho Dept. Of Water Resources

  2. Overview • Acquiring and Processing NHD • Incorporating Existing Water Right Data Into NHD • NHD Network Analysis • Integrating Real Time Stream Gauge Data Into NHD • Future Projects

  3. Acquiring The National Hydrographic Dataset (NHD) • Download each Basin (85 for Idaho) • Each Basin Is In Personal Geodatabase format

  4. Processing the NHD • Append • Incorporate each basin into one statewide dataset • Re-Project • NHD is distributed in Geographic NAD 83. • IDWR uses Idaho Transverse Mercator • Load Into ArcSDE • Maximum size of Personal Geodatabase: 2GB • Clean data • Remove duplicate arcs • Remove overlapping hydrologic basins • Verify network connectivity between basins

  5. NHD Issues • Editing the NHD • Missing 2 ½ NHD basins (Jordan Creek, Lower Snake/Asotin, and part of Lake Pend Oreille) • NHD data quality • Names • Canal Names • Gaps in network

  6. NHD Structure

  7. Using The NHD As A Water Right Framework • Extending the NHD to handle water rights • A water right consists of two (spatial) components • Point of Diversion (POD): Diversion from live flow. • Place of Use (POU): Area where the water will be used.

  8. Before Snap After Snap Adding Existing Water Rights To NHD • Attach points to network • Current framework is 100K streams, and GCDB. Need to migrate those points to the more detailed 24K stream network.

  9. 225,000+ Point of Diversions

  10. Stream Showing Flow Direction Network Analysis • Flow direction • Can model water flow

  11. Trace Results: All Segments Downstream of Flag Network Analysis TasksTrace Downstream Place Network Flag

  12. Network Analysis TasksTrace Downstream • Follows stream flow direction to the lowest point in the system basin • In Idaho can trace downstream from Palisades Res. on the Snake River at the Wyoming border, to the Snake/Clearwater River confluence in Lewiston

  13. Network Analysis TasksTrace Downstream Snake/Salmon Confluence Palisades Res.

  14. Trace Results: All Stream Segments Upstream Of Flag Are Selected Place Network Flag Network Analysis TasksFind Upstream Accumulation

  15. Network Analysis TasksFind Upstream Accumulation • Find all segments upstream of a network flag • Can be used to find all Point of Diversions upstream from a location of a new water permit application. • Find the oldest priority date above a diversion.

  16. Using The NHD As A Water Right Framework Find Total Upstream Diversion Rate

  17. Using The NHD As A Water Right Framework All Diversions Upstream Of Network Flag

  18. Using The NHD As A Water Right Framework Results: Selected Diversions and Total Diversion Rate

  19. Real Time Gauge Information • USGS – NWIS Web • Bureau Of Reclamation • Hydromet: Stream Gauges • Hydromet: Lake levels and storage • Idaho Power • Lake levels in Hells Canyon • Stream Gauges

  20. Integrating Stream Gauge Into NHD • View stream flow in real time • Use data stored from multiple internet sources as a single GIS layer • Can be used to verify upstream diversion rates

  21. Real Time Gauging Station Data Bureau of Rec. Gauging Stations and NHD

  22. Real Time Gauging Station Data Retrieving Gauging Stations Attributes In ArcMap

  23. Real Time Gauging Station Data Retrieving Gauging Stations Charts In ArcMap

  24. Reservoir Data Retrieving Reservoir Storage Data In ArcMap

  25. Reservoir Data

  26. Future Projects • Migration From ArcView 3.x to ArcGIS • Desktop/Server/Engine? • Web-based Water Right Applications • Have applicant create digital boundary of POU on the web. • Digitize POD on screen

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