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GIS Applications for Ground-Water Management in Bucks County

This presentation outlines the current management method for ground-water allocations in SE PA and explores the uses of GIS in water availability concerns in Bucks County. It demonstrates the use of GIS to determine equation coefficients for computing mean annual base flow and showcases an application using revised base flow from diabase areas. Additionally, it highlights the process of locating a new beneficial streamflow monitoring location using GIS.

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GIS Applications for Ground-Water Management in Bucks County

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  1. Bucks County Department of Health

  2. Presentation Outline • Current management method for GW allocations in SE PA and the uses of GIS • Display a developing concern for water availability in part of Bucks County using GIS • Display GIS use to determine equation coefficients for computing mean annual base flow from potential critical areas • An application using revised baseflow from diabase areas using GIS tool • Locating a new beneficial streamflow monitoring location using GIS FOR MORE INFO... Amleto A. Pucci, Jr. aapucci@co.bucks.pa.us Bucks County Department of Health

  3. Bucks County Location within 1) SE PA Ground-water Management Area, and 2) Pennsylvania PENNSYLVANIA Southeastern PA Ground-Water Management Area Bucks County Philadelphia Bucks County Department of Health

  4. Current management method for GW allocations in SE PA and the uses of GIS Bucks County Department of Health

  5. Bucks County Department of Health

  6. Bucks County Department of Health

  7. Annual Mean Baseflow in Four Watersheds used for Management Analysis Bucks County Department of Health

  8. GIS determined Subcrop Composition in Select Watershed Areas inE PA Ground-water Management Area Bucks County Department of Health

  9. Mean Annual Baseflow in MGD/mi2 Various Return Periods in Hydrogeologic Subcrop Areas Return Period * Values used for water management model Bucks County Department of Health

  10. Display a developing concern for water availability in part of Bucks County using GIS Bucks County Department of Health

  11. Dwelling Units/sq. mi for Bucks Co. Municipalities, 2000 Bucks County Department of Health

  12. Nine Bucks Co. Municipalities where Diabase is most Extensive Bucks County Department of Health

  13. Display GIS use to determine equation coefficients for computing mean annual base flow from potential critical areas Bucks County Department of Health

  14. Four Watersheds used for Management Analysis, & Tohickon Creek Watershed, with Subcrop Geology (Note-outline of Little Lehigh is shown as type and not accurate.) Bucks County Department of Health

  15. Bucks County Department of Health

  16. Bucks County Department of Health

  17. Statistical Test of the Difference in Mean Annual Baseflow for Tohickon Creek and Skippack Creek. • H0: m1 = m2Mean of Log values of Mean Annual Runoff is same • H1: m1 m2 Mean of Log values of Mean Annual Runoff is not the same • t-Test: Two-Sample Assuming Unequal Variances Tohickon Skippack • Mean of Log Q Values -1.345 -1.169 • Variance 0.080 0.093 • Observations 37 28 • Pearson Correlation NA • Pooled Variance 0.085 • df 56 • t -2.382 • P(T<=t) two-tail 0.021 • t Critical two-tail 2.003 Bucks County Department of Health

  18. Bucks County Department of Health

  19. Mean Annual Baseflow in MGD/mi2 Various Return Periods in Hydrogeologic Subcrop Areas Return Period * Values used for water management model Bucks County Department of Health

  20. An application using revised baseflow from diabase areas applying GIS tool Bucks County Department of Health

  21. An Application of Revised Model analysis to Tohickon Creek Bucks County Department of Health

  22. Tohickon Creek Mean Annual Baseflow MGD for Various Return Periods w/wout Distinct Diabase Baseflow Return Period * Values used for water management model Bucks County Department of Health

  23. Locating a new beneficial stream monitoring location using GIS Tool Bucks County Department of Health

  24. Bucks County Department of Health

  25. Conclusions • Ground-water management method for SE PA is a reasonable “zeroth order” budget approach • Baseflow revised estimates from diabase areas was significantly less than is currently used in current GW Management Model • GIS tool greatly facilitated revision of the GW Management Model and model application Bucks County Department of Health

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