TRADITIONAL WINDROW &TRENCH-FILL REVETMENTS,

& A NEW INVENTION, VEGETATED TRENCH-FILL

REVETMENT{All 3 are classified as “Setback

Revetments”}

THESE ARE ALL SELF-ADJUSTING, SELF-HEALING

BANK STABILIZATION METHODS (NOT

FOUNDATION DEPENDENT) THAT ARE USUALLY BUILT

OUTSIDE THE ACTIVE STREAM CHANNEL

1. Typically easy to construct & inspect2. Bank erosion must occur for the windrow or trenchfill stone to

launch into the scoured area3. In-stream construction is avoided4. Self-adjusting, self-filtering stone is required5. Maximum scour depth must be calculated to to determine volume

of stone required. Rule of thumb is 1 ton of stone per foot will stabilize 3 ft of scour.

6. Works best in easily eroded, non-cohesive soils exhibiting a uniform erosion rate throughout the entire bend

7. Can be quickly & easily constructed, comparatively inexpensive, easy to inspect. Since all work is outside the channel & above OHW, some permits might not be required!

WINDROW REVETMENTS

A continuous volume of stone placed on an engineered alignment landward

of an actively eroding riverbank or streambank.

WINDROW (SET-BACK)

REVETMENT

WINDROW REVETMENT, KANSAS RIVER, EUDORA BEND, KS. Approx. half of the stone has launched, remainder is still on top bank. Bank stable & vegged.

TRADITIONAL TRENCH-FILL REVETMENTS

TRENCH-FILL REVETMENTCalculated volume of stone placed in a trench on an

engineered alignment landward of an eroding bank. As erosion undermines the trench, stone is designed to self-adjust (launch) into the scoured area forming a stable, adjustable toe (or toe & mid-bank protection, depending on bank height & depth of trench). In some projects the upper bank is graded & either vegetated or riprapped.

Trenchfill Revetment

Initial ChannelCross-Section

ExcavatedTrench

Disposal

WellGradedstone in trench

Active Eroding

Bank

MigratingChannel

Upper bank

riprap

From Freddie Pinkard COE, Vicksburg District, modified by DLD

Trenchfill Revetment

Initial ChannelCross-section

Launched stone

stabilized eroded

sections of bank (toe & mid bank)

Final ChannelCross-section

ErodingBank

Upper bank

riprap

From Freddie Pinkard COE, Vicksburg District, modified by DLD

TRENCHFILL REVETMENT, RED RIVER, LA. Designed to provide the correct alignment &

bend radii needed for navigation.

Red River, LA.-Trenchfill with upper bank paving. Foreshore almost completely eroded back to the trenchfill stone & weighted toe

TRENCHFILL REVETMENT detail drawings

from John McCullah’s

www.E-SenSS.com

TRENCHFILL REVETMENT-Stone is on the wrong side of the trench (away from river). When erosion undermines the trench as much stone as

possible needs to be launched immediately, not a few stones at a time!

A NEW IDEA, VEGETATED

TRENCH-FILL REVETMENTS

A DAVE DERRICK

DISCOVERY (DDD)

While 3 projects have been designed using this idea, only one has been built

(recently).

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VEGETATED TRENCH-FILL REVETMENTS-Steps in construction

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VEGETATED TRENCH-FILL

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Vegetation on

backslope protected from river

forces allowing for great growth

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CASE STUDY:& LAKE ECOSYSTEM

RESTORATION EFFORT

PROJECT CONSTRUCTED

Oct ??, - Nov. ??, 2014

THE BACKSTORY • Since the pipeline protection project is

totally off of the pipeline right-of-way, the use of several different shrub & tree bioengineering techniques can be used in conjunction with a continuous low-elevation stone toe protection & a set of redirective Bendway Weirs.

AERIAL PHOTOS

AERIAL PHOTO-Flow x to x.

AERIAL PHOTO-Provided by x, Dated x-x-2014

PRE-PROJECT PHOTOS

by Dave Derrick Jul. xx, 2014

(One year before construction started)

PRE-PROJECT-Looking US @ .

PRE-PROJECT-DEMO PROJ-WALNUT CR.-CLIVE IA.-DERRICK x-x-2014

THE PLAN

THE PLAN

CONSTRUCTION PHOTOS

by Dave Derrick Oct. xx, 2014

CONSTRUCTION-Looking US @ .

CONSTRUCTION-WHITE RIVER @ XXX. PIX DON GRESS x-xx-2014

This PowerPoint presentation was developed & built by Dave Derrick.

Any questions or comments, call my personal cell @ 601-218-7717, or email @ d_derrick@r2d-eng.com

Enjoy the information!!

This chair fits

me!!!