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Preliminary Feasibility Study for South San Francisco Bay Shoreline Economic Impact Areas 1 to 10 Appendix IV: Hydraulic Analysis Final Report

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Preliminary Feasibility Study for South San Francisco Bay Shoreline Economic Impact Areas 1 to 10 Appendix IV: Hydraulic Analysis Final Report Preliminary Feasibility Study for South San Francisco Bay Shoreline Economic Impact Areas 1 to 10 Appendix IV: Hydraulic Analysis Final Report Prepared For: Santa Clara Valley Water District Prepared By: Noble Consultants/G.E.C., Inc. March, 2016 Preliminary Feasibility Study for South San Francisco Bay Shoreline Hydraulic Analysis March 2016 Table of Contents 1.0 Introduction ............................................................................................................................ 1 2.0 Change to HEC-RAS Geometric Data ................................................................................... 3 3.0 HEC-RAS Boundary Conditions ............................................................................................ 9 3.1 Downstream Water Surface Elevations .......................................................................... 9 3.2 Flow Hydrographs .......................................................................................................... 9 4.0 Computed 100-Year Water Surface Elevations ................................................................... 13 5.0 Site Photos ........................................................................................................................ 104 i Preliminary Feasibility Study for South San Francisco Bay Shoreline Hydraulic Analysis March 2016 List of Figures Figure 1. Creeks Included in the Hydraulic Analysis .................................................................... 2 Figure 2. HEC-RAS Model Coverage for Matadero Creek .......................................................... 4 Figure 3. HEC-RAS Model Coverage for Barron Creek and Adobe Creek .................................. 5 Figure 4. HEC-RAS Model Coverage for Permanente Creek ...................................................... 6 Figure 5. HEC-RAS Model Coverage for Stevens Creek ............................................................ 7 Figure 6. HEC-RAS Model Coverage for Sunnyvale West Channel, Sunnyvale East Channel, Calabazas Creek, and San Tomas Aquino Creek ............................................................ 8 Figure 7. 100-Year Flow Hydrograph at Upstream Boundary for Matadero Creek .................... 10 Figure 8. 100-Year Flow Hydrographs at Upstream Boundaries for Barron Creek and Adobe Creek ............................................................................................................................... 11 Figure 9. 100-Year Flow Hydrograph at Upstream Boundary for Permanente Creek ............... 11 Figure 10. 100-Year Flow Hydrograph at Upstream Boundary for Stevens Creek .................... 12 Figure 11. 100-Year Flow Hydrographs at Upstream Boundaries for Sunnyvale West Channel, Sunnyvale East Channel, Calabazas Creek, and San Tomas Aquino Creek ................. 12 Figure 12. Computed 100-Year Water Surface Elevations Compared to Levee/Floodwall Elevations for Matadero Creek (Year 0) .......................................................................... 68 Figure 13. Computed 100-Year Water Surface Elevations Compared to Levee/Floodwall Elevations for Matadero Creek (Year 50 with SLR 1) ..................................................... 69 Figure 14. Computed 100-Year Water Surface Elevations Compared to Levee/Floodwall Elevations for Matadero Creek (Year 50 with SLR 2) ..................................................... 70 Figure 15. Computed 100-Year Water Surface Elevations Compared to Levee/Floodwall Elevations for Matadero Creek (Year 50 with SLR 3) ..................................................... 71 Figure 16. Computed 100-Year Water Surface Elevations Compared to Levee/Bank Elevations for Barron Creek (Year 0) ................................................................................................ 72 Figure 17. Computed 100-Year Water Surface Elevations Compared to Levee/Bank Elevations for Barron Creek (Year 50 with SLR 1) ........................................................................... 73 Figure 18. Computed 100-Year Water Surface Elevations Compared to Levee/Bank Elevations for Barron Creek (Year 50 with SLR 2) ........................................................................... 74 Figure 19. Computed 100-Year Water Surface Elevations Compared to Levee/Bank Elevations for Barron Creek (Year 50 with SLR 3) ........................................................................... 75 Figure 20. Computed 100-Year Water Surface Elevations Compared to Levee/Floodwall Elevations for Adobe Creek (Year 0) .............................................................................. 76 Figure 21. Computed 100-Year Water Surface Elevations Compared to Levee/Floodwall Elevations for Adobe Creek (Year 50 with SLR 1) .......................................................... 77 Figure 22. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Adobe Creek (Year 50 with SLR 2) .......................................................... 78 Figure 23. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Adobe Creek (Year 50 with SLR 3) .......................................................... 79 Figure 24. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Permanente Creek (Year 0) ..................................................................... 80 ii Preliminary Feasibility Study for South San Francisco Bay Shoreline Hydraulic Analysis March 2016 Figure 25. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Permanente Creek (Year 50 with SLR 1) ................................................. 81 Figure 26. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Permanente Creek (Year 50 with SLR 2) ................................................. 82 Figure 27. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Permanente Creek (Year 50 with SLR 3) ................................................. 83 Figure 28. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Stevens Creek (Year 0) ............................................................................ 84 Figure 29. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Stevens Creek (Year 50 with SLR 1)........................................................ 85 Figure 30. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Stevens Creek (Year 50 with SLR 2)........................................................ 86 Figure 31. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Stevens Creek (Year 50 with SLR 3)........................................................ 87 Figure 32. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale West Channel (Year 0) ........................................................... 88 Figure 33. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale West Channel (Year 50 with SLR 1) ....................................... 89 Figure 34. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale West Channel (Year 50 with SLR 2) ....................................... 90 Figure 35. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale West Channel (Year 50 with SLR 3) ....................................... 91 Figure 36. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale East Channel (Year 0) ............................................................ 92 Figure 37. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale East Channel (Year 50 with SLR 1) ........................................ 93 Figure 38. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale East Channel (Year 50 with SLR 2) ........................................ 94 Figure 39. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Sunnyvale East Channel (Year 50 with SLR 3) ........................................ 95 Figure 40. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Calabazas Creek (Year 0) ........................................................................ 96 Figure 41. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Calabazas Creek (Year 50 with SLR 1) ................................................... 97 Figure 42. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Calabazas Creek (Year 50 with SLR 2) ................................................... 98 Figure 43. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for Calabazas Creek (Year 50 with SLR 3) ................................................... 99 Figure 44. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for San Tomas Aquino Creek (Year 0) ........................................................ 100 Figure 45. Computed 100-Year Water Surface Elevations Compared to Levee or Floodwall Elevations for San Tomas Aquino Creek (Year 50 with SLR 1) .................................... 101 iii Preliminary Feasibility Study for South San Francisco Bay Shoreline
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