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

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May 05, 2023 956 likes •1.23k 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

SLIDE 1

CFAAR

A framework to aid development of p stream corridor enhancement plans

Shawn M. Chartrand

RRNW 2012

SLIDE 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

d l study example

SLIDE 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

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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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

Facilitate design and permitting

goal

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

SLIDE 5

Context

C

Feasibility

F

Feasibility Alt ti

A

Alternatives

A A

Analysis

Hydraulic *Fishery *Physical

A

Refinement

R

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

SLIDE 6

Context

Thi i h i ll

Spatial:

This is where it all starts:

Where are you
Processes, attributes
Episodicity

Temporal:

Transience
Permanent shifts

Social:

Social fabric

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

SLIDE 7

Context

Temporal:

What conditions: What conditions:

Mount, J.F., and Fong, J.C., 1995, California rivers and streams. University of California Press Berkeley California

a) have worked,

University of California Press, Berkeley, California.

b) presently working, ) k to shape the corridor c) may work p

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

SLIDE 8

Feasibility

B li i b f ibili Be explicit about feasibility:

Perceived Risk

Kondolf, M., 2011, Setting goals in river restoration: when and where can the river “heal” itself?. Geophysical monograph series vol. 194

Available Land Control Hydrologic & S di t Sediment Supply Integrity Renew

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

Regulatory requirements

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Feasibility

Be explicit about feasibility:

Perceived Risk

Define goals and objectives:

Control

e.g. –

Refugia habitat

Available Land Hydrologic & Sediment Supply Integrity

Control Renew

Floodplain engagement
Downstream sediment supply

Supply Integrity Regulatory requirements

Renew

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

SLIDE 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

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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Analysis

Hydraulic Alternatives Pros & Cons

Conduct analysis of design alternatives

Life Cycle Costs Hydraulic *Fishery *Physical

Goal: preferred alternative

DESIGN ALTERNATIVES

p

Commensurate

Balance

Habitat Metrics Sediment Transport

Balance
Learn

Component Stability

Advancing quickly

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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Refinement

Never be afraid to switch directions

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

SLIDE 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

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

SLIDE 14

Stevens Creek at Blackberry Farm, Cupertino, CA

Designed ‘06 ’07
Adaptive management
Designed ‘06-’07
Constructed ‘08
Re-constructed 1,600 ft. channel
Adaptive management
2-year ~ 190 cfs*
Passage, habitat, alluvial
Important steelhead stream CCESU
Partners accept adjustment
Gravel surplus
5-yr + 2, 2-yr events

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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CFAAR

SF Bay

C F

SF Bay

C A

San Jose

16 18

Count of Riffle Wavelength

Riffle wavelength

A

unt, n=49 8 10 12 14

wavelength e count

R

Cou 2 4 6 8

Riffle

R

Project Reach

2 4 6 8 10 12 14 16 18 20

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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Post Project Conditions

Design flow estimate MPM Post construction obs Post construction obs.

Large difference in Transport rates! rates!

CFAAR

Reservoir

CFAAR

design flow

Implications?

flow range

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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Post Project Conditions CFAAR CFAAR

POOL ADJUSTMENT ADJUSTMENT RIFFLE ADJUSTMENT

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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Post Project Conditions

project reach

CFAAR

ONMYK Length‐Frequency, F2010

p ojec eac

CFAAR

steelhead census

20 25 30

Blackberry02, n=191; Reach Length=378 DeepCliff01, n=97; Reach Length=308 DSFremontDrop, n=68; Reach Length=213

? ?

10 15

Count

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

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.

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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

Overview of CFAAR Why is CFAAR Needed? Case Example Stevens Ck.