OSBORNE HOLLOW CREEK ROAD PROTECTION PROJECT. Gravel-Cobble Bed Stream – Rural, Pool-Riffle-Pool,...

OSBORNE HOLLOW CREEK

ROAD PROTECTION PROJECT

Gravel-Cobble Bed Stream – Rural, Pool-Riffle-Pool, Stream Slope 2-3% Goals: Halt bank erosion to protect NY State Highway 7, & Widen Road

Shoulder

Solution: Install Deeply-Keyed (weighted toe) Vegetated Riprap

Let’s think this thing through!!!!

OSBORNE HOLLOW CR. – DEC 12, 2006

THE FIRST PLAN

Double Boil-UP Pools-Osborne Hollow Cr.-

Near Binghamton, NYPlanform View

Flow

Stable

Riprap with veg-1 ton/ft

Rip

rap

with

ve

g-3

tons

/ft

StableStable

Rip

rap

with

veg-

3 to

ns/ft

Riprap with veg-1 ton/ft

Dig Boil-Up Pool, 35 ft in diameter, 4 ft

deep

Dig Boil-Up Pool, 30 ft in diameter, 4 ft

deep

Riprap with veg-2 to

ns/ft

Rip

rap

with

veg-

1 to

n/ft

THE LANDOWNER

BOO BOO

Osborne Hollow Cr.-Near Binghamton, NY

Planform View

FlowLandowner channel

StableStable Seve

re e

rosi

onSome erosion

Landowner levee

Landowner dredged area

Looking US at landowner dug channel in stream.

OSBORNE HOLLOW CR. – JUNE 24, 2007 - PIX BY DERRICK

Looking DS at landowner cutoff channel & levee


Looking US from within landowner

cutoff channel. Note steep slope of bottom

of dug trench.

OSBORNE HOLLOW CR. – JUNE 24, 2007 -

PIX BY DERRICK

Landowner cutoff channel is aimed at his house, which is 35 ft from top bank!!


Looking US. Headcuts migrating US thru the landowner cutoff channel.

OSBORNE HOLLOW CR. – DEC 20, 2007 - PIX BY DERRICK

During our in-field meeting with the landowner, he felt his channel aimed at his house will work, so we decided

to abandon our first plan (double-boil-up pool) & go with a pure road

protection scheme. We will not touch the landowner’s work, in fact we photo-documented the site pre-

& post project construction

THE SECOND

PLAN VEGETATED KEYS &

RIPRAP

Osborne Hollow Cr.-Near Binghamton, NY

Planform View

FlowLandowner channel

Stable

Stable Seve

re e

rosi

on

Some erosion

Landowner levee

Landowner dredged area

State Highway 7Vegetated keys & riprap

Looking DS. White painted line will be toe trench for riprap


Gravel-Cobble Bed Stream–Install Soil-Choked Vegetated (Single-Row Bent Willow

Pole) Weighted-Toe Full-Bank Height Riprap

Pre-project profile view. Looking upstream

State Hwy 7

Varies between 6 & 13 ft

Let the actual construction

begin !!!! June 25, 2007

Looking DS at toe-down trench for riprap


Looking US at toe-down trench for riprap




Weighted toe trench dug 5 ft down & 4 ft wide

State Hwy 7



Bedload cobble-gravel used as fill material to provide a 2 on 1 slope

State Hwy 7

700 STREAMCO WILLOW PLANTS WERE HARVESTED

BY NYS-DOT PERSONNEL FROM THE NRCS PLANT MATERIAL CENTER, BIG

FLATS, NY. AVERAGE PLANT SIZE WAS 12-15 FT LONG & 1-

1.5 INCH BUTT DIAMETER



12-16 ft long Streamco Willow placed @ a density of 5 stems/ft

State Hwy 7

Looking US. Placing streamco willow in toe-down trench


Looking US. Installing a thick layer of willow & toe stone.




Trench & bank toe area filled with DOT graded

“Heavy” riprap

State Hwy 7

Looking US. Filling toe-down trench with DOT heavy stone


Looking DS. Willows in place, setting riprap toe stone


Looking US. Weighted-toe trench almost filled with stone.


THE “SINGLE ROW” BENT WILLOW POLE METHOD

Willow placed at a density of 5 stems/ft.



Log

Using an available log held in the bucket of the

trackhoe, willows are pulled streamward

State Hwy 7

A long 2 by 4 was used to bend willows away from the bank.


Stone was then placed from above onto the upper section of the bank.




Using the front end loader, riprap is placed on mid & upper bank areas {landward of the

willows}

State Hwy 7

Placing stone on mid & upper sections of bank.




Bedload cobble-gravel is used to choke all riprap.

This resulted in a 2 to 3 ft wider road

shoulder.

State Hwy 7

Stone is then “choked” with bed material from stream, then compacted.


Looking US. Stone & choke material results in a wider highway shoulder.




Seed or hydroseed all

disturbed areas

State Hwy 7

THE US KEY IS A STONE KEY WITH DEEPLY

PLANTED VEGETATION

Looking US. Placing DOT graded “heavy” stone in US key


Looking DS at US key. Note angle of key to stream.


Looking DS at US key.


Looking DS at US key. Key construction is complete.


WHAT HAPPENS OVER TIME ??? 5

MONTHS LATER

Looking US at willow & stone protection by the road.


Looking US at willow & stone protection.


Looking US at stream & road.


CLEOPHUS SPEED ELVIS DERRICK, AT RESTQuestions?

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OSBORNE HOLLOW CREEK ROAD PROTECTION PROJECT. Gravel-Cobble Bed Stream – Rural, Pool-Riffle-Pool,...

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