Community. Restoration. Prevention. Truckee Wetlands Restoration - - PowerPoint PPT Presentation

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Community. Restoration. Prevention. Truckee Wetlands Restoration - - PowerPoint PPT Presentation

Nov 10, 2022 340 likes •829 views

Community. Restoration. Prevention. Truckee Wetlands Restoration Project Thank you to our Funders Donors to the O UR V ALUES P ARTNERSHIPS E COLOGICALLY S OUND E CONOMICS Truckee River Watershed Council May 2002 TRWCs Programs

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  • Community. Restoration. Prevention.
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Truckee Wetlands Restoration Project

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Thank you to our Funders

Donors to the

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Truckee River Watershed Council May 2002

OUR VALUES

  • PARTNERSHIPS
  • ECOLOGICALLY

SOUND

  • ECONOMICS
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TRWC’s Programs

PROTECT:: Adopt-a-Stream RESTORE: Merrill Davies Stream & Meadow ENGAGE: 19th Annual Truckee River Day October 19, 2014

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THE TRUCKEE RIVER IS NOT PRISTINE.

ROADS / DAMS / ERODING

BANKS / DOWNCUTTING

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RESTORED ECOLOGICAL FUNCTION / RAISED WATER TABLE / CLEANER WATER

Photo by Mathew Grimm, used by permission of Environmental Defense Fund.

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Truckee Wetlands Restoration Project

Presented by Jeannette Halderman, TRWC David Shaw, Balance Hydrologics

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∗ Town of Truckee ∗ Truckee Donner Public Utility District ∗ Truckee Donner Recreation and Park District ∗ Truckee Sanitation District ∗ Truckee Tahoe Airport District ∗ Truckee Donner Land Trust Contact with adjacent land owners

Thank you Truckee Wetlands Restoration Partnership

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∗ Fragmented wetland complex ∗ None of wetlands are fully functioning

∗ Disconnected Hydrology ∗ Significant storm Runoff ∗ Significant Erosion ∗ Inappropriate Land Use

What is the Problem?

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∗ 2010 TRWC convened partnership of land managers, property owners, and stakeholders ∗ Goals:

∗ Include all stakeholders ∗ Understand what restoration is achievable ∗ Work in conjunction with other projects ∗ Restore connectivity and function

Truckee Wetlands Restoration Partnership

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Irrigation Pond Irrigation Pond Town Old Corp Yard

2012 1963

Photo Credit CA Dept of Transportation

Project Area Historical and Now

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∗ 2010 – TRWC and Balance compiled ∗ Brockway Trails Geotechnical Studies ∗ Historical Analysis (others and Balance Hydrologics) ∗ Wetland Delineations ∗ Current Conditions ∗ Soils maps ∗ Opportunities and constraints ∗ Recommendation: restoration is possible

Feasibility Study

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Geology

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Historical Wetland Soils

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Historical Map

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∗ DAVE PLEASE INSERT 1939 AERIAL PHOTO FIGURE

1939 Aerial Photography

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1972

(Source: USFS)

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Inferred Historical Wetland Extent

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Impaired Areas

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Impaired Areas

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Impaired Areas

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∗ Truckee Wetlands Restoration Feasibility Study ∗ Soil and Hydrology ∗ Analysis of Irrigation ∗ Conceptual Design ∗ Continued partner meetings

Truckee Wetlands Restoration Project Assessment

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Soils and Hydrology

∗ Evaluate soils and their water-holding properties ∗ Estimate water volumes and expected flow rates ∗ ∗ Evaluate surface and groundwater interaction ∗ Collect baseline data

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Soils and Hydrology

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Inferred Geologic Structure

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Soils & Groundwater Investigation

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Surface and Groundwater Monitoring

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Surface – Groundwater Interaction

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Surface – Groundwater Interaction

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Surface – Groundwater Interaction

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Irrigation Pond Water Level, Inflow, Outflow

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Depth to Groundwater

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Groundwater Elevations

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Shallow Groundwater Flow Direction (Winter)

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Shallow Groundwater Flow Direction (Summer)

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Analysis of Irrigation Pond Hydrology

INFLOW OUTFLOW Inflow from ditch1 Direct Precipitation2 Pond outflow1 Estimated evaporation from pond3 Estimated Irrigation Use4 gpm gpd inches gpd gpm gpd ft gpm gpd gpd days/wk gpm October 80 115,200 1.58 1,799 nm nm 0.45 4.2 6,092 120,000 6 70 November 121 174,493 6.05 7,118 nm nm 0.31 2.9 4,241 December 120 172,800 7.33 8,346 nm nm 0.22 2.1 2,989 January 206 297,285 0.48 547 224 323,136 0.13 1.2 1,708 February 63 90,478 0.13 164 58 84,015 0.08 0.8 1,139 March 130 187,419 1.47 1,674 135 193,882 0.11 1.0 1,509 April 94 135,717 0.51 600 108 155,105 0.17 1.6 2,306 120,000 6 70 May 103 148,643 1.78 2,027 40 58,164 0.29 2.8 4,014 120,000 6 70 June 121 174,493 0.45 529 13 19,388 0.41 3.9 5,665 120,000 6 70 July 108 155,105 0.03 34 0.56 5.3 7,600 120,000 6 70 August 81 116,329 0.01 11 0.59 5.6 8,113 120,000 6 70 September 126 180,956 0.85 1,000 0.53 5.0 7,259 120,000 6 70

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∗ Artificial fill on historical wetland soils in places, but not everywhere ∗ Bedrock terrace with seasonal and disconnected hydrology and limited groundwater storage ∗ Springflow conveyed across wetland; limited subsurface flow between pond and shallow groundwater

∗ Surface flows should be used to restore hydrology

Summary of Findings

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∗ 5 Areas of focus ∗ Improve hydrology of meadow (remove ditches/channels) ∗ Attenuation ∗ Expand meadow and riparian habitat area ∗ Reduce Erosion/sedimentation ∗ Create recreation/education

  • pportunities

Restoration Objectives & Concept Design

Outfall at Truckee River Culverts under Legacy Trail - Outfall at Truckee River

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5 Areas of Focus

1 2 5 4 3

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Focus Area 1 – Existing Conditions

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Pedestrian trail/boardwalk

Focus Area 1 – Restored Condition

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Focus Area 2 - Existing Conditions

Pedestr trian F Footpath th

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Focus Area 2 –Restored Condition

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Focus Area 3 – Restored Condition

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Focus Areas 3, 4 & 5 – Restored Condition

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∗ 2014/2015 Design ∗ 2015-2018Phased Implementation

∗ Focus Area 1, 2 &3 ∗ Focus Area 4 ∗ Focus Area 5

∗ 2015-2023 Post-Implementation Monitoring

Next Steps

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THANK YOU!!