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Urban Watershed Delineation: Incorporation of Storm Sewer Networks

Urban Watershed Delineation: Incorporation of Storm Sewer Networks. James Bornemann Undergraduate Student Dept. of Geodesy and Geomatics Engineering University of New Brunswick. Background. Fredericton Area Watersheds Association (FAWA) Community based monitoring and research

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Urban Watershed Delineation: Incorporation of Storm Sewer Networks

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  1. Urban Watershed Delineation:Incorporation of Storm Sewer Networks James Bornemann Undergraduate Student Dept. of Geodesy and Geomatics Engineering University of New Brunswick

  2. Background • Fredericton Area Watersheds Association (FAWA) • Community based monitoring and research • City of Fredericton • Population ~ 50,000 • Environmental management by watershed • Socioeconomic and biophysical conditions • Need: Accurate watershed boundaries

  3. The City of Fredericton

  4. Social Ecological Conditions

  5. Previous Delineations • New Brunswick DELG small scale delineation • Wade MacNutt • Local scale • Combined automatic and manual method

  6. Storm Sewer Networks • Are storm sewer networks significant to watershed delineations? • Historical Evidence • Ditch to divert headwaters of the swamp • ~155 acres for development • Unknown location of early pipes • Size vs. land use of area

  7. Historic Map – The Swamp

  8. Watershed Delineation Methodology • Based on Digital Terrain Model (DTM) • Analyze topological relationships to model hydrological processes • Assumption: Surface Flow Only Digital Terrain Model

  9. Topographical Watershed Delineation Filled DTM Flow Direction Accumulation Grid Generated Streams Identify Outlets Watershed Delineation

  10. Storm Sewer Delineation Identify Storm Sewer Network Delineate Catch BasinWatersheds • Other Considerations • Roads • Other Drainage Networks Final Delineation

  11. Watershed Comparison

  12. Types of Watersheds • 3 Types of Watersheds: • Urban-Topographic • Composite • Shared Maps of the 3 types

  13. Accuracy • Process vs. Accuracy • Precision of elevation data • +/- 10 ft. Vertical • <100 ft. Spacing of Elevation Data

  14. Environmental Management Application • Require good information to make good management decisions • Overlay watersheds and land use to help determine cause and affect • Corbett Brook Watershed Management Example…

  15. Corbett Brook Land Use

  16. Summary • Methodology for delineating urban watersheds with storm sewer networks • Storm sewer networks can significantly alter watershed boundaries • Accuracy must be considered • Land use of additional area can be as important as the increase in area

  17. Questions? • Contact: James Bornemann, d191d@unb.ca

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