city of madison –proposed project wingra park shoreline … · 2017-10-13 · lake access design...
TRANSCRIPT
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Wingra Park Shoreline Repair
CITY OF MADISON – PROPOSED PROJECT
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Wingra Park‐Current Shoreline
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Wingra Shoreline
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Wingra Shoreline
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WingraShoreline
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Wingra Shoreline
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Wingra Shoreline‐ Concrete Abutment + Wooden Pier
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Wingra Shoreline‐ Concrete Abutment + Wooden Pier
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Wingra Shoreline
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Wingra Shoreline
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Wingra Shoreline
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Wingra Shoreline
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Wingra Shoreline
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Wingra Shoreline‐Plan View
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Wingra‐Low Energy Shoreline
•Wave energy low•Different from Mendota/Monona•Smaller, shallower lake•Short fetch (small waves)•Short fetch (small waves)
•Cannot “hard armor” shoreline (per DNR)•Limits riprap use
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Types of Shoreline Stabilization•Soft-armor bioengineering-Plant materials into structures that are designed to withstand wave and ice action
•Appropriate where plants can grow •Root structures naturally stabilize the shoreline
•Rock riprap-common hard-armor technique which consists of large rocks placed in the water and up along the shoreline
•Lined with geotextile fabric to prevent wave action from removing soil from behind rocks, causing slumping
•Erosion control fabrics-useful on slopes for holding soil in place until plants establish from seed•Geotextile fabrics-made of densely woven material that can withstand intense wave energy when placed under rock riprap
http://www.shoreline.msu.edu/shorelinemgt/erosion-control/
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Lake Access Design Considerations Met with key park users throughout design process
Friends of Lake Wingra, Wingra Boats, UW Rowing, Logrollers
Equitable, sustainable opportunity for water access for multiple purposes
Signature design that provides opportunities to interact with the shoreline as well as: Reduce maintenance and capitol costs Provide shoreline protection from wave and ice damage Can be permitted through the Wisconsin DNR and Army Corp
of Engineers permitting process Aesthetic integration into the shoreline
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Proposed Shoreline Changes
•Encapsulated Soil Lifts•Rock Riprap•Limestone Step Lake AccessLimestone Step Lake Access•New Dock•Moving location of UW Boating Pier•Adding small canoe/kayak launch
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Wingra Shoreline‐Design Layout
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Riprap‐ Rendering to Scale
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Other Similar Projects:Riprap on the Yahara River
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Other Similar Projects:Riprap on the Yahara River
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Proposed Riprap Location
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Limestone Steps‐ Rendering to Scale
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Other Similar Projects:Limestone Steps on the Yahara River
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Other Similar Projects:Limestone Steps being built ‐ Lake Monona
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Other Similar Projects:Limestone Steps– Ester Park Lake Monona
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Proposed Limestone Step Location
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Encapsulated Soil Lifts‐Rendering to Scale
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Encapsulated Soil LiftsGoals•Reduce erosion into lake•Aesthetically pleasing, natural
Process•Encapsulation of soil in biodegradable blankets formed into layers•The layers, or lifts, are stacked up on the bank, stepped back to create the desired slope•Seeded and planted with natives
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Encapsulated Soil Lifts
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Encapsulated Soil Lifts
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Encapsulated Soil Lifts
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Encapsulated Soil Lifts
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Encapsulated Soil Lifts
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Encapsulated Soil Lifts
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Encapsulated Soil Lifts
http://www.shoreline.msu.edu/shorelinemgt/demonstration/lakescape3/
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Proposed Encapsulated Soil Lift Locations
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Proposed Native Sedges and Forbs• Low perennials and sedges with a height <3’• Tolerant of fluctuating water and long duration under water• Planting species to be determined based on elevation from ordinary high water mark
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Proposed Native Sedges and ForbsExample Plants:• Iris versicolor ‐ Blue Flag Iris• Lobelia cardinalis ‐ Cardinal Flower• Saggittaria latifolia – Arrowhead• Carex stipata – Awl‐fruited Sedge• Carex comosa – Bottlebrush Sedge• Carex molesta – Field Oval Sedge• Carex vulpinoidea – Brown Fox Sedge• Scirpus atrivirens – Dark Green Bulrush• Polygonum amphibium – Water
Smartweed• Alisma trivale – Water Plantain• Juncus effusus – Common rush
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Proposed Shoreline Changes•1:1 riprap for log rollers•Bumping out all features to protect trees•1 maple deemed unhealthy by forestry
•Will be replaced in similar area•Will be replaced in similar area•Replacing wooden deck•Moving UW Women’s Rowing dock •Small canoe/kayak launch •Resetting corner of stone wall at boat ramp
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Wingra Park‐ Concrete Abutment + Wooden Pier
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Wingra Shoreline
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Other Shoreline Details
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Anticipated Timeline
•Permitting - fall/winter 2017•Construction - early spring 2018 or late fall 2018
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Citations http://www.shoreline.msu.edu/shorelinemgt/
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MSU ESL Detail