1 / 18

Assessing Land Development Impact on Surface Runoff Using GIS Analysis

This study evaluates the effects of land development on surface runoff through GIS techniques. By analyzing various datasets, including the National Land Cover Dataset and USGS data, we assess changes in water flow due to development. A detailed methodology calculates peak flow using runoff coefficients and rainfall intensity, showing potential increases in runoff by up to 30% in certain areas post-development. Findings highlight the importance of proactive planning to mitigate runoff issues. The study also discusses limitations and future research directions.

malo
Télécharger la présentation

Assessing Land Development Impact on Surface Runoff Using GIS Analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?

More Related