Minnehaha creek reach 14 streambank improvement project
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Minnehaha Creek – Reach 14 Streambank Improvement Project. Design Concept 1 – From the Creek. Is this a “fun” stream to paddle? The allure of a journey, what’s around the next bend? Viewing wildlife Viewing architecture Hearing the sounds Connecting with the water.

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Minnehaha Creek – Reach 14 Streambank Improvement Project

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Minnehaha Creek – Reach 14Streambank Improvement Project


Design Concept 1 – From the Creek

  • Is this a “fun” stream to paddle?

  • The allure of a journey, what’s around the next bend?

    • Viewing wildlife

    • Viewing architecture

    • Hearing the sounds

    • Connecting with the water


Design Concept 1 – From the Creek


Is Natural Buffer Strong Enough?

  • Project feasibility study included hydraulic modeling

    • Average bankfull shear stress = 0.43 lb/ft2

    • Max, 100 yr shear stress at France Ave. weir = 1.2 lb/ft2

By the numbers, in general nothing larger than 6” rock is required.

Homeowner observations?


Design Concept 2 – From the Home

Is this the “best” stream to live on?

Different aesthetic preferences

Neat & orderly

Manicured

Natural & organic

  • Different desires in ownership

    • Viewing wildlife

    • Viewing the stream

    • Hearing the sounds

    • Access to the water

    • Separation from neighbors


What Could It Look Like?

Before

After


Variable Site Conditions

  • Sun exposure (Full sun to full shade)

  • Slope

  • Existing rip rap (rock) or retaining wall

  • Variable water levels

  • Existing structure or gardens


Sun Exposure

Full Sun to Full Shade – There are natives for that

Images courtesy of Prairie Moon Nursery


Slope


Existing Turf Grass – Remove & Re-Vegetate with Native Buffer

  • Rely on the strength of the deep growing roots.


Existing Rip Rap – Cover w Soil & Re-Vegetate with Native Buffer

Minneapolis Avenue

Minnetrista, MN


Existing Rip Rap – Live Stake or Joint Planting


Existing Retaining Wall – Replace with Vegetated Rock Wall

  • Retaining walls offer no habitat

  • But retaining walls are usually installed for specific reasons

    • Hydraulic protection of bridges and culverts

    • Maximize real estate

  • Vegetated Rock Wall

    • Space between the stones provide edge habitat

    • Reduces the need to regrade the banks

    • Overhanging vegetation can reduce thermal loading of the stream

  • Reflective flow


Existing Retaining Wall – Replace with Vegetated Rock Wall


Existing Retaining Wall – Replace with ‘Terraced Pocket’ Boulder Wall


Variable Water Levels

Excerpts from Shaw, D. and Schmidt, R. 2003, Plants for Stormwater Design


Work with Existing Structures & Gardens


Concept Plan


In Stream Habitat Improvements

  • Root Wads

    • Provide wood debris and cover

    • Protect the bank from erosion


In Stream Habitat Improvements

  • Vegetated Brush Mattress

    • Build up eroded areas by trapping sediment


In Stream Habitat Improvements

  • In-Stream Boulders

    • Provide small scour pools & current breaks


In Stream Habitat Improvements

  • Stream Barbs

    • Diverts flow from eroding banks

    • Capture sediment


In Stream Habitat Improvements

  • Coir Logs

    • Capture sediment during high water levels


Visit Wenck’s Similar Projects

  • Shingle Creek Drive & Hampshire Ave., Brooklyn Park, MN

    • Stabilize Shingle Creek streambanks, install native buffer and add in-stream habitat for an entire reach

  • 26th Ave & Sycamore Ln Plymouth, MN

    • Stabilize Plymouth Creek streambanks, install native buffer and add in-stream habitat for an entire reach

  • Minneapolis Ave & Crest Ridge Ct., Minnetrista, MN

    • Recreate a waterway out of an eroded gully that can handle urban runoff.

    • Example of vegetated riprap


Preparation for the Site Visit

  • Review your sun condition (sun, part sun or shade).

  • Review the seed list that matches your sun condition.

  • Review the plant list the matched your sun condition and select the one you think will complement the seed list and your landscaping.

  • Review the concept plan and make edits, write down your thoughts and be prepared to discuss.


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