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 14 streambank improvement project

Minnehaha Creek – Reach 14Streambank Improvement Project


Design concept 1 from the creek

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 creek1

Design Concept 1 – From the Creek


Is natural buffer strong enough

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

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

What Could It Look Like?

Before

After


Variable site conditions

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

Sun Exposure

Full Sun to Full Shade – There are natives for that

Images courtesy of Prairie Moon Nursery


Slope

Slope


Existing turf grass remove re vegetate with native buffer

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

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

Minneapolis Avenue

Minnetrista, MN


Existing rip rap live stake or joint planting

Existing Rip Rap – Live Stake or Joint Planting


Existing retaining wall replace with vegetated rock wall

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 wall1

Existing Retaining Wall – Replace with Vegetated Rock Wall


Existing retaining wall replace with terraced pocket boulder wall

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


Variable water levels

Variable Water Levels

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


Work with existing structures gardens

Work with Existing Structures & Gardens


Concept plan

Concept Plan


In stream habitat improvements

In Stream Habitat Improvements

  • Root Wads

    • Provide wood debris and cover

    • Protect the bank from erosion


In stream habitat improvements1

In Stream Habitat Improvements

  • Vegetated Brush Mattress

    • Build up eroded areas by trapping sediment


In stream habitat improvements2

In Stream Habitat Improvements

  • In-Stream Boulders

    • Provide small scour pools & current breaks


In stream habitat improvements3

In Stream Habitat Improvements

  • Stream Barbs

    • Diverts flow from eroding banks

    • Capture sediment


In stream habitat improvements4

In Stream Habitat Improvements

  • Coir Logs

    • Capture sediment during high water levels


Visit wenck s similar projects

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

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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