Hydrologic Systems Analysis for Water Quality Assessment

Principals Thomas Burke and Operations Impacts in the Hydrologic Systems exhibit a comprehensive analysis of scenarios and comparison between Preferred Alternative (PA) and No Action Alternative (NAA). The assessment covers river stage reductions, channel siltation, and the impact on water quality in various months of the year. The detailed evaluation aids in decision-making for effective water resource management.

• Water Quality Assessment
• Hydrologic Systems
• Scenario Analysis
• River Stage Reduction
• Channel Siltation

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1. THOMAS BURKE, P.E. Principal, Hydrologic Systems SDWA Exhibit 258 1

2. HORB Operations Impacts To Stage Impacts To WQ SDWA Exhibit 258 2

3. DSM2 Model 82 Year Period In The BA 16 Year Period For Boundary Condition Enhanced Probability Analysis Scenarios Preferred Alternative (PA) No Action Alternative (NAA) From The Biological Assessment SDWA Exhibit 258 3

4. Scenario Jan Feb March April May June Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 CWF PA Spring Barrier CWF NAA Spring Barrier Scenario July August September October November December Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 Week 1-2 Week 3-4 CWF PA Fall Barrier CWF NAA Fall Barrier SJR SDWA Exhibit 2584

5. SDWA Exhibit 258 5

6. Comparison Of The PA To The NAA SDWA Exhibit 2586

7. SDWA Exhibit 2587

8. SDWA Exhibit 2588

9. SDWA Exhibit 258 9

10. Minimum Reduction in River Stage Between The PA and The NAA (ft.) Exceedance Value Site 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 10% 20% 50% -1.87 -1.12 -0.79 -0.25 -0.15 -0.06 -0.04 -0.03 -0.30 -0.20 -0.07 -0.93 -0.16 -0.02 -0.12 -0.02 -1.36 -0.75 -0.53 -0.17 -0.08 -0.03 -0.01 -0.01 -0.21 -0.13 -0.03 -0.62 -0.10 -0.01 0.01 0.02 -0.62 -0.31 -0.20 -0.03 0.04 0.09 0.08 0.07 -0.05 0.01 0.08 -0.25 -0.01 0.06 0.49 0.18 SDWA Exhibit 258 10

11. Channel Siltation DSM2 Channel Invert Accuracy Ability To Irrigate Pumps Siphons SDWA Exhibit 258 11

12. SDWA Exhibit 258 12

13. SDWA Exhibit 25813

14. SDWA Exhibit 258 14

15. SDWA Exhibit 258 15

16. SDWA Exhibit 258 16

17. SDWA Exhibit 258 17

18. SDWA Exhibit 25818

19. SDWA Exhibit 258 19

20. Percent Change In Flow Between The PA and the NAA (%) Exceedance Value Site 10% 1 -57% 2 -57% 3 -58% 4 -83% 5 -164% 6 -163% 7 -118% 8 -122% 9 -67% 10 -68% 11 -72% 12 -64% 13 -245% 14 -114% 15 -23% 16 -23% 20% 50% -54% -54% -54% -57% -86% -86% -97% -98% -60% -60% -62% -54% -130% -90% 0.3% 0.3% -48% -48% -49% -46% -47% -47% -30% -30% -51% -51% -50% -34% -59% -26% 57% 58% SDWA Exhibit 258 20

21. Stage Impacts Model Representation of The Correct Channel Invert Impacts To Flushing Flow SDWA Exhibit 258 21