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Water Quality Master Planning

Water Quality Master Planning. A Barton Creek Model Katherine G. Osborne CE 394K.2 Surface Water Hydrology. Topics of Discussion. Background What are we modeling? How are we doing it? What are the outputs? Conclusions. Background. Why does Austin care? A Brief History

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Water Quality Master Planning

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  1. Water Quality Master Planning A Barton Creek Model Katherine G. Osborne CE 394K.2 Surface Water Hydrology

  2. Topics of Discussion • Background • What are we modeling? • How are we doing it? • What are the outputs? • Conclusions

  3. Background Why does Austin care? A Brief History • Christine’s Model • Phase II

  4. What are we modeling? Flows Loads Best Management Practices removals TSS BOD COD TOC DP TP NH3 TKN NO TN Cu Pb Zn

  5. How are we doing it? • Flows • Loads • BMP removals

  6. Flows - Inputs Impervious Cover Related to land use Flow Direction Based on CRWR Pre-Pro of 30 m DEMs Correction Grid Not used Recharge Flow From Recharge script which requires: Cell Recharge Recharge zone grid, Creek grid, Flow accumulation, Flow direction, Watershed, and Upstream points.

  7. Flows - Equations Rv = 0.3428IC 2+ 0.5677IC + 0.0125 Rv bf = - 0.36IC + 0.1904 In recharge zone, Flow = Raw Flow - Recharge

  8. Flows - Outputs Corrected direct runoff generated in each cell Corrected base flow generated in each cell Total flow without considering recharge Total predicted flow Direct runoff Base flow

  9. Loads - Inputs Direct runoff EMC table Base flow EMC table Impervious cover coverage or grid Flow direction grid Water land use zones grid Direct runoff Base flow generated Total flow without considering recharge Cell recharge

  10. Loads - Equations • Equations EMC = a+bIC EMC bf = C if IC< undeveloped (15%) D if IC> undeveloed

  11. Loads - Outputs Load grids for constituents for which the load is computed. TSSBOD COD TOC DP TP NH3 TKN NO TN Cu Pb Zn

  12. Best Management Practices Located BMPs defined by mass removedLocated BMPs defined by efficiencyNon-located BMPs defined by efficiency InputsFlow direction grid Flow accumulation gridBMPs point coverage - The attribute table must contain a load removed field. Initial load grid - the result of the load computation. OutputRemoved Load grid

  13. Conclusions Needs to include: Future land use Channel Erosion Nice Tool

  14. Questions?

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