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DETERMINING LAND DEVELOPMENT EFFECT ON SURFACE RUNOFF USING GIS

DETERMINING LAND DEVELOPMENT EFFECT ON SURFACE RUNOFF USING GIS. Objectives. To assess the changes in water flow due to development Validate USGS Data and Hydrology Analysis Tools. Study Area Location. Study Area (Continued). Data. Bureau of Transportation Statistics (BTS) Road

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DETERMINING LAND DEVELOPMENT EFFECT ON SURFACE RUNOFF USING GIS

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  1. DETERMINING LAND DEVELOPMENT EFFECT ON SURFACE RUNOFF USING GIS

  2. Objectives • To assess the changes in water flow due to development • Validate USGS Data and Hydrology Analysis Tools

  3. Study Area Location

  4. Study Area (Continued)

  5. Data • Bureau of Transportation Statistics (BTS) Road • National Land Cover Dataset (NLCD) 2001 – Land Cover • National Elevation Dataset (NED) 1/3 Arc Second • Digitized Land Development Data

  6. Land Cover, Roads & Development

  7. DEM, Roads & Development

  8. Surface Runoff Calculation Q = C*i*A Q = Peak Flow (volume/time) C = Runoff Coefficient (dimensionless) i = Rainfall intensity (depth/time) A = Drainage Area (area)

  9. Surface Runoff Coefficient Values (VDOT)

  10. Road Reclassification

  11. Surface Runoff Before & After Development

  12. Flow Accumulation Tool

  13. Derived Stream Network Before and After Development

  14. Ratio of Water Accumulation in Stream Network

  15. Ratio of Water Accumulation in Stream Network in ArcScene

  16. Conclusion • New development in the study area could cause as much as 30% increase in water flow in some areas • USGS Data & Hydrology Analysis yielded reasonable results • The methodology could be used to assess the need for public agencies to proactively address future developments

  17. Study Limitations &Future Study Suggestions • Proposed Grade (elevation) of New Development assumed unchanged • More recent Land Cover Data • Proposed Development is assumed as a single Land Cover Category • Effects of existing/proposed pour points are ignored

  18. Questions?

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