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GIS Analysis in Land Management

GIS Analysis in Land Management. Presented by: Jimmy West, The Schneider Corporation. Presentation Overview:. Creating Computer Generated Watersheds Use of Drainage Calculation Software to Assess Drainage with Parcels, Watersheds & Soils Layers. Accuracy….

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GIS Analysis in Land Management

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  1. GIS Analysis in Land Management Presented by: Jimmy West, The Schneider Corporation

  2. Presentation Overview: • Creating Computer Generated Watersheds • Use of Drainage Calculation Software to Assess Drainage with Parcels, Watersheds & Soils Layers

  3. Accuracy… • Fancy software does not equal accurate data • Additional data layers will only be as accurate as basemap • Parcels must be maintained and up to date through a known date – almost all GIS layers will refer back to ownership information

  4. Watersheds of the Past?

  5. Software Used to Create Computer Generated Watersheds • ESRI – ArcInfo • ESRI – Spatial Analyst Tools

  6. Data Layer Sources Needed for Computer Generated Watersheds • 2’ contours – seamless • Linear stream features – seamless and topologically correct

  7. Computer Generated Watershed Raster Processes • Elevation Raster • Flow Direction Raster • Flow Accumulation Raster • Raster Streams Layer

  8. Assumptions and Obstacles: …and 3 things to know about drainage • Assumptions • Water runs downhill • Water drains into streams • Obstacles • “Sinks” and “Peaks” • Culverts

  9. “Fill” Process for Sinks and Peaks

  10. Streams at Culverts

  11. Zoomed Stream Elevation Raster

  12. “Burning” in the Streams

  13. Creation of Computer Generated Watersheds • Hydrology Modeling extension is used to “burn in streams” and build watersheds using raster images created from contour data • Computer generated watersheds are merged/attributed to match County’s existing tiered administrative watershed system

  14. Computer Generated WatershedsThreshold = 5000 Watersheds Computer Generated WatershedsThreshold = 500 Watersheds

  15. Tiered Watershed Layer

  16. Drain Calc Overview • Preparing Data For Use in Drain Calc • Multiple assessment methodologies • One rate per acre assessments • Proportional assessments

  17. Tiered Watershed Layer

  18. Watershed/Parcel Overlay

  19. Watershed/Parcel Intersect - Lower

  20. Watershed/Parcel Intersect - Upper

  21. Watershed/Parcel/Soil Intersect

  22. Range of Watershed Assessment Options • Flat rate per benefited acre • Setting minimum assessment amount(s) • Additional assessment options • Soils • Parcel class/landuse • Distance from hydrological features • other

  23. Individual Watershed Projects

  24. Defined Watershed Project

  25. Apply Assessment Rule Selections

  26. Soil Type Rule Example

  27. Import Parcel Data

  28. Define Hearing/Notice Report Info

  29. Generate Reports/Notices

  30. Print Assessment Schedule

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