Recreation and Park Commission Lilly Allen 5/25/16 Overview Why - - PowerPoint PPT Presentation

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Recreation and Park Commission Lilly Allen 5/25/16 Overview Why - - PowerPoint PPT Presentation

Nov 16, 2022 17 likes •348 views

Gravel Augmentation Update Recreation and Park Commission Lilly Allen 5/25/16 Overview Why Gravel Projects? Past Projects 2016 Project Questions? If interested & time allows: Underlying Science Beyond 2016

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Gravel Augmentation Update Recreation and Park Commission

Lilly Allen 5/25/16

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Overview

  • Why Gravel Projects?
  • Past Projects
  • 2016 Project
  • Questions?
  • If interested & time allows:

– Underlying Science – Beyond 2016

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Declining Fish Habitat

Central Valley dams have drastically reduced habitat.

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Overview

  • Why Gravel Projects?
  • Past Projects
  • 2016 Project
  • Questions?
  • If interested & time allows:

– Underlying Science – Beyond 2016

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7 Sites ranging from 0.7 – 5 acres

2011 2008 2012 2013 2010 2009

River Bend Lower Sailor Bar Upper Sunrise Upper Sunrise Side Channel Nimbus Basin

2014

Upper Sailor Bar Downstream Upper Sailor Bar Upstream

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Nimbus Basin

2014

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Lower American Gravel Augmentation and Side Channel Creation

2014 Site – Nimbus Basin

Before

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Lower American Gravel Augmentation and Side Channel Creation

2014 Site – Nimbus Basin

After

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Nimbus Basin

Before After

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Overview

  • Why Gravel Projects?
  • Past Projects & Results
  • 2016 Project
  • Questions?
  • If interested & time allows:

– Underlying Science – Beyond 2016

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2016

Sacramento Bar

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Current Condition

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18.6 acres

Proposed Changes

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Public Outreach: Mailers & Signs

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Disturbance

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Woody Material Placement

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Questions?

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Overview

  • Why Gravel Projects?
  • Past Projects & Results
  • 2016 Project
  • Questions?
  • If interested & time allows:

– Underlying Science – Beyond 2016

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American River Specific Habitat Suitability Criteria

  • 2. Depth
  • 1. Velocity
  • 3. Gravel Size
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2010 Site – Upper Sunrise

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A New (additional) Design Criterion

  • 1. Depth
  • 4. Hyporheic Flow

(Froude Number)

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gD V Fr / 

Fr = Froude Number V = Water Velocity g = Gravity D = Hydraulic Depth

New Horizons in Design

Calculating hyporheic flow using Froude numbers Gravity

  • Inertia =

Helps indicate boundary between turbulent and laminar flow conditions

We can use this to better predict where salmon will spawn

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<3 juvenile fish per 25 m2 >82 juvenile salmon per 25 m2

Density = 0.10 per m2 Density = 3.25 per m2

Before After 1m

1m

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Overview

  • Why Gravel Projects?
  • Past Projects & Results
  • 2016 Project
  • Questions?
  • If interested & time allows:

– Underlying Science – Beyond 2016

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3) Embryo and Alevin Incubation 4) Juvenile Rearing 5) Juvenile Emigration 1) Adult Immigration and holding 2) Adult Spawning

What do they need? General salmon life cycle

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Juvenile Rearing

Complex side channel habitat

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Questions?