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CFAAR A framework to aid development of p stream corridor - PowerPoint PPT Presentation

May 05, 2023 •956 likes •1.22k views

CFAAR A framework to aid development of p stream corridor enhancement plans Shawn M. Chartrand RRNW 2012 1 OBJECTIVES OF MY TALK: 1. Explain why CFAAR is needed CFAAR is needed 2. Overview of CFAAR concept CFAAR concept 3. Review of

  1. CFAAR A framework to aid development of p stream corridor enhancement plans Shawn M. Chartrand RRNW 2012 1

  2. OBJECTIVES OF MY TALK: 1. Explain why CFAAR is needed CFAAR is needed 2. Overview of CFAAR concept CFAAR concept 3. Review of one case study example d l 2

  3. Why should we spend our time developing a new framework? p g 1. Outstanding set of existing guidance documents 2. Symbolic attributes and non-ideal cases Why is CFAAR Overview of Case Example Needed? Stevens Ck. 3 CFAAR

  4. Why should we spend our time developing a new framework? p g What is a non-ideal case? • Opportunistic restoration • Unplanned restoration • Lacking supporting studies • Compressed timelines • Compressed timelines  Heavy loads & high pressure goal Facilitate design and permitting Why is CFAAR Overview of Case Example Needed? Stevens Ck. 4 CFAAR

  5. C Context F Feasibility Feasibility A A Alt Alternatives ti A A Hydraulic Analysis *Fishery *Physical R Refinement Why is CFAAR Overview of Case Example Needed? Stevens Ck. 5 CFAAR

  6. Context Thi i h This is where it all starts: i ll Spatial: • Where are you • Processes, attributes • Episodicity Temporal: • Transience • Permanent shifts Social: • Social fabric Why is CFAAR Overview of Case Example Needed? Stevens Ck. 6 CFAAR

  7. Context Temporal: What conditions: What conditions: a) have worked, Mount, J.F., and Fong, J.C., 1995, California rivers and streams. University of California Press Berkeley California University of California Press, Berkeley, California . b) presently working, c) ) may work k to shape the corridor p Why is CFAAR Overview of Case Example Needed? Stevens Ck. 7 CFAAR

  8. Feasibility B Be explicit about feasibility: li i b f ibili Kondolf, M., 2011, Setting goals in river restoration: when and where can the river “heal” itself?. Geophysical Perceived Risk monograph series vol. 194 Control Available Land Hydrologic & S di Sediment t Supply Integrity Renew Why is CFAAR Overview of Case Example Needed? Stevens Ck. 8 CFAAR Regulatory requirements

  9. Feasibility Be explicit about feasibility: Perceived Risk Define goals and objectives: e.g. – Control Control Available Land • Refugia habitat Hydrologic & Sediment Supply Integrity Supply Integrity • Floodplain engagement Renew Renew • Downstream sediment supply Regulatory requirements Why is CFAAR Overview of Case Example Needed? Stevens Ck. 9 CFAAR

  10. Alternatives Develop possible project concept alternatives • Descriptive design concepts p p • Concept review workshop  Work to gain consensus  Work to gain consensus • Reach out to regulators Why is CFAAR Overview of Case Example Needed? Stevens Ck. 10 CFAAR

  11. Analysis Conduct analysis of Alternatives Pros & Cons design alternatives Hydraulic Hydraulic Life Cycle *Fishery Costs *Physical • Goal: preferred alternative p DESIGN • Commensurate ALTERNATIVES • Balance Balance Habitat Sediment Metrics Transport • Learn Component • Advancing quickly Stability Why is CFAAR Overview of Case Example Needed? Stevens Ck. 11 CFAAR

  12. Refinement Never be afraid to switch directions Why is CFAAR Overview of Case Example Needed? Stevens Ck. 12 CFAAR

  13. CFAAR Re-cap When opportunity knocks and time is of the essence: • Context - establishes founded trajectory. • Feasibility - establishes expectations & focus scope • C & F sets the stage for alternatives selection • Analysis – use a balance of approaches • Refinement - never be afraid to switch directions • From refinement one moves to complete design documents Why is CFAAR Overview of Case Example Needed? Stevens Ck. 13 CFAAR

  14. Stevens Creek at Blackberry Farm, Cupertino, CA • Designed ‘06-’07 • Designed ‘06 ’07 • Adaptive management • Adaptive management • Constructed ‘08 • 2-year ~ 190 cfs* • Re-constructed 1,600 ft. channel • Passage, habitat, alluvial • Important steelhead stream CCESU • Gravel surplus • Partners accept adjustment • 5-yr + 2, 2-yr events Why is CFAAR Overview of Case Example Needed? Stevens Ck. 14 CFAAR

  15. CFAAR F C C SF Bay SF Bay A San Jose 18 A Riffle Count of Riffle Wavelength 16 wavelength wavelength 14 e count 12 unt, n=49 10 R R 8 8 Cou Riffle Project Reach 6 4 2 0 0 2 4 6 8 10 12 14 16 18 20 Why is CFAAR Overview of Case Example Needed? Stevens Ck. CFAAR 15

  16. Post Project Conditions Design flow estimate MPM Post construction obs Post construction obs. Large difference in Transport rates! rates! C FAAR C FAAR • Reservoir Implications? design flow flow range Why is CFAAR Overview of Case Example Needed? Stevens Ck. 16 CFAAR

  17. Post Project Conditions C F AAR C F AAR POOL ADJUSTMENT ADJUSTMENT RIFFLE ADJUSTMENT Why is CFAAR Overview of Case Example Needed? Stevens Ck. 17 CFAAR

  18. Post Project Conditions CFAAR CFAAR p ojec eac project reach steelhead census ONMYK Length ‐ Frequency, F2010 ? ? 30 Blackberry02, n=191; Reach Length=378 DeepCliff01, n=97; Reach Length=308 25 DSFremontDrop, n=68; Reach Length=213 20 Count 15 10 5 0 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 Fork Length (5mm Increment) Fork Length (5mm Increment) Data provided by Jae Abel, Santa Clara Valley Water District Why is CFAAR Overview of Case Example Needed? Stevens Ck. 18 CFAAR

  19. In conclusion: CFAAR can usefully CFAAR can usefully aid design development under development under non-ideal cases Questions? Thanks to: - Everyone I have worked with - City of Cupertino - Jana Sokale - Santa Clara Valley Water District Why is CFAAR Overview of Case Example Needed? Stevens Ck. 19 CFAAR

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