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An Internet/GIS-Based Tool to Assist Community Planners

An Internet/GIS-Based Tool to Assist Community Planners. Bernie Engel Jon Harbor Don Jones and many others. Project Goal.

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An Internet/GIS-Based Tool to Assist Community Planners

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  1. An Internet/GIS-Based Tool to Assist Community Planners Bernie Engel Jon Harbor Don Jones and many others

  2. Project Goal Create an interactive environmental analytical and educational program utilizing a WWW and GIS-based approach to answer questions associated with “urban sprawl” similar to: What will be the estimated impact on the environment due to placing a subdivision in one location vs another?

  3. Post-development Land Use Change Pre-development

  4. Post-development Land Use Change Pre-development

  5. Short-term Impact

  6. Long-term Impact • Dominated by runoff from smaller storm events • Increase in surface water quantity • Decrease in surface water quality

  7. Non-point Source (NPS) Pollution • Originates from diffuse sources as a response to • Land use • Storm events • Carried in stormwater runoff from • Agricultural lands, construction sites, urban areas • Long-term impacts • Storage (lake) loss from sediment deposition • Adverse effect of chemical pollutants

  8. L-THIA/NPS Model • An overview / screening model • Quantify impact of development on long-term runoff and NPS pollution in urbanizing watersheds • Based on NRCS Curve Number (CN) technique. • User friendly, low data requirements.  Soil types  Land use / Land cover  Long-term daily precipitation record (30 years) • Identifies need for more detailed modeling. • "What-If" alternative evaluation with GIS

  9. L E C W a t e r s h e d S u b - b a s i n 1 S u b - b a s i n 2 2 1 S u b - b a s i n 3 S u b - b a s i n 4 S u b - b a s i n 5 N 3 4 W E 1 0 1 2 K i l o m e t e r s S 5 Little Eagle Creek (LEC) Watershed

  10. Land Use Change in LEC Watershed

  11. 80% 60% 1984-1991 1973-1984 40% 20% 0% -20% Runoff Nitrogen Phosphorus Lead Copper Zinc Change in Runoff and NPS Pollution

  12. L-THIA WWW Input • State and County identify nearest weather station • Weather data queried from Oracle • User assigns land use (LU), hydrologic soil group, and projected LU area for up to three periods • Hydrologic soil group maps served with ArcView/IMS

  13. L-THIA WWW Output • Runoff output table summarizes land use information entered, curve number, runoff depth, and runoff volume for each year

  14. L-THIA WWW Chart • Bar graphs provide runoff depth, runoff volume, total volume, and average runoff depth

  15. L-THIA WWW Chart • All NPS pollution estimates are available in tabular, bar chart, and pie chart forms

  16. Summary and Conclusions • L-THIA/NPS is: • A user-friendly, screening model. • Focused on long-term impacts on hydrology and NPS pollution. • Sensitive to land use change, antecedent moisture conditions, and climatic variability. • Accessible for simple “what-if” planning.

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