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

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

6. Impervious CoverRelated to land use Flows - Inputs Flow DirectionBased on CRWR Pre-Pro of 30 m DEMs Correction GridNot used Recharge FlowFrom 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. TSS TSS BOD COD TOC DP TP NH3 TKN NO TN Cu Pb Zn

12. Best Management Practices Located BMPs defined by mass removed Located BMPs defined by efficiency Non-located BMPs defined by efficiency Inputs Flow direction grid Flow accumulation grid BMPs point coverage - The attribute table must contain a load removed field. Initial load grid - the result of the load computation. Output Removed Load grid

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

14. Questions?