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groundwater recharge from mains leakage

CE 394K.3 GIS in Water Resources. groundwater recharge from mains leakage. Beatriz Garcia-Fresca November 2002. datasets: GEOLOGY. geology + city footprint. datasets: WATER MAINS. source: City of Austin GIS datasets. data processing. reprojecting  Texas Central State Plane (US ft)

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groundwater recharge from mains leakage

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  1. CE 394K.3 GIS in Water Resources groundwater recharge from mains leakage Beatriz Garcia-Fresca November 2002

  2. datasets:GEOLOGY

  3. geology + city footprint

  4. datasets:WATERMAINS source:City of Austin GIS datasets

  5. data processing • reprojecting Texas Central State Plane (US ft) • spatial analysis  reclassification of geology according to relativepermeability • calculations: CoA water usage  leakage • geoprocessing: isolating pipes by aquifer group

  6. relative permeabilities

  7. relative permeabilities

  8. calculations

  9. calculations • attributes: diameter & length • calculations: • V each pipe • total V pipes • daily V of water per pipe • daily leakage (~7%) • add leakage of all pipes

  10. summary and results average pumpage CoA 520631.78 m3/d  CoA Water & Wastewater Utility total V of pipes 672465.55 m3  from GIS project coeff. 0.774 area of Austin 271.8 sqmi  City of Austin – Austin Facts 703.962 Km2 annual precipitation 840 mm  NOOA total mains loss 12 %  Austin American Statesman, 1998 real loss (leakage) 7 %  Thornton, 2002 36434.2 m3/d results from GIS project 13.3 million m3/a 18.89 mm/a 4.80 in/a

  11. datasets:WASTEWATERMAINS Work in progress source:City of Austin GIS datasets

  12. a fun digression

  13. conclusions • the urban induced recharge in Austin is significant • utility lines can be analyzed using ArcHydro tools • ArcGIS presents more operational problems than ArcView

  14. future work • add recharge from wastewater mains • what are the qualitative implications? • refine calculations: • include infiltration coeffs. of soils?

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