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Arc Hydro: GIS for Water Resources

Arc Hydro Hydronetwork Drainage systems Channels Time Series Modeling Hydrologic integration. Arc Hydro: GIS for Water Resources. David R. Maidment, University of Texas at Austin. The Arc Hydro data model and application tools are in the public domain.

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Arc Hydro: GIS for Water Resources

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  1. Arc Hydro Hydronetwork Drainage systems Channels Time Series Modeling Hydrologic integration Arc Hydro: GIS for Water Resources David R. Maidment, University of Texas at Austin The Arc Hydro data model and application tools are in the public domain

  2. Bringing together these two communities by using a common geospatial data model Arc Hydro design took 3 years from 1999 - 2002 CRWR GIS CRWR GIS in Water Resources Consortium Water Resources

  3. Hydrologic Information System Analysis, Modeling, Decision Making Arc Hydro Geodatabase

  4. Geographic Data Model • Conceptual Model – a set of concepts that describe a subject and allow reasoning about it • Mathematical Model – a conceptual model expressed in equations • Data Model – a conceptual model expressed in a data structure • Geographic Data Model – a data model for describing and reasoning about the world

  5. What is Arc Hydro? • A geographic data model for storing geospatial and temporal water resources data in ArcGIS • A set of hydro objects built on top of ArcObjects • A set of standardized attributes • A vocabulary for describing data (glossary) • A toolset for implementing the data model

  6. Drainage System Hydro Network Flow Time Time Series Hydrography Channel System Arc Hydro Data Model

  7. ArcGIS Hydro Data Model Hydrology Hydrography

  8. Data Model Based on Inventory Streams Drainage Areas Hydrography Channels Terrain Surfaces Rainfall Response Digital Orthophotos

  9. Data Model Based on Behavior Follow a drop of water from where it falls on the land, to the stream, and all the way to the ocean.

  10. Integrating Data Inventory using a Behavioral Model Relationships between objects linked by tracing path of water movement

  11. Arc Hydro Framework Input Data Watersheds Waterbody Streams Monitoring Points

  12. Arc Hydro Framework

  13. National Hydro Data Programshttp://www.crwr.utexas.edu/giswr/nhdconf/nationalhydro.html National Elevation Dataset (NED) National Hydrography Dataset (NHD) Elevation Derivatives for National Application (EDNA) Watershed Boundary Dataset

  14. Arc Hydro Framework Dataset for the Guadalupe Basin

  15. HydroNetwork through Canyon Lake Flowlines through water body Generic Junction (for topological connection of edges)

  16. Network Tracing Upstream Tracing Downstream Tracing

  17. HydroJunction has Waterbody Relationship

  18. Watersheds of the Guadalupe Basin NWS forecast Watersheds (flooding) Guadalupe HydroNetwork EPA TMDL Segments (water quality) TNRCC water availability points (water supply)

  19. Scales of representation of Drainage Systems Basins – drainage areas for water resources management Watersheds – subdivision of Basin for a particular hydrologic purpose Catchments – subdivision of Basin into elementary drainage areas by physical rules Digital Elevation Model – land surface terrain grid cells

  20. Direction of Flow Channel Cross-Section Channel Cross-Section

  21. Channel ProfileLines

  22. Guadalupe Network Study area only 1.4 km!

  23. Study Area (Guadalupe river near Seguin, TX) 1/2 meter Digital Ortho Photography

  24. Boat setup for data collection

  25. Depth Sounder (Echo Sounder) The electronic depth sounder operates in a similar way to radar It sends out an electronic pulse which echoes back from the bed. The echo is timed electronically and transposed into a reading of the depth of water.

  26. Differential GPS: Bank to Boat GPS gives the location of each point collected in terms of latitude and longitude. Two locations for differential GPS.

  27. Channel Data Each point has (x,y,z)

  28. Interpolation Points are interpolated in ArcMap to produce a continuous surface.

  29. Centerline Define the centerline along the thalweg of the channel

  30. Measure in ArcGIS Measures are assigned in meters 154.41 54.37 0 281.36 A PolylineM can store m-values at each vertex along with x and y coordinates.

  31. Coordinate Transformation m is measure along the centerline r is distance across the river from the centerline Sinuous river becomes straight when transformed into (m,r) co-ordinates.

  32. Coordinate Transformation Straightened river Profile line and cross-sections Sinuous river

  33. Straightened River in 3D

  34. Data back to x,y coordinates Profile lines and cross-sections in (x,y) created using FishNet in (m,r). Original river in X,Y

  35. Profile Lines and Cross Sections in 3D Bird’s eye view!

  36. Arc Hydro Time Series Object TSDateTime TSValue FeatureID TSType

  37. National Water Information System Arc Hydro NWIS data retrieval tool Web access to USGS water resources data

  38. Retrieving NWIS Data • Select Gage Layer • Enter Period of Record

  39. Streamflow Time Series Arc Hydro Time Series Table

  40. Time Series Extracted to Excel(In Excel, use Data/Get External Data to query Geodatabase) Excel view Geodatabase view

  41. Real-time Nexrad data supplied every 15 minutes on a 2km grid Data from 14 radars calibrated with 435 rain gages At end of month more careful calibration is done for historical rain map archive Nexrad Data for Florida

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