Bank Erosion and Deposition Assessment Protocol: A Tool for ...
Bank Erosion and Deposition Assessment Protocol: A Tool for Monitoring Watershed Restoration Projects Presentation By: Kathy Bergmann, Jane Fava, and Aaron Clauser, Ph.D.
Brandywine Valley Association 1760 Unionville-Wawaset Road West Chester, PA 19382 (610) 793-1090 793 1090 (610) 793-2813 fax
RETTEW Associates, Inc. Natural Sciences Group 950 East Main Street, Suite 220 S h lkill Haven, Schuylkill H PA 17972 (570) 385-2270 (570) 385-2217 fax
Why?
Installed Pin Cross Section View
Transect Installation •Transect: 8 sets of bank pins, 10 m interval spacing on one bank •Representative sampling of bank stability and in-stream conditions •Pin #1: Just below the ordinary high water mark •Pin #2: 1/2 the distance from the ordinary high water mark to the topp of the bank •Pin #3: Control point on the top of bank
Data Analysis y •Sampled Monthly •Volunteer l data d entry into spreadsheet •Qualitative evaluation •Rainfall and bank erosion/ deposition change rate over time •Semi-quantitative comparisons of rainfall events and the bank erosion/deposition rate
Study Site Selection •Selected Four Sites Throughout Radley Run Watershed: •“Stable” Control Site •Impaired Site Selected for a Restoration Project •Typical Mowed Lawn where Volunteers Monitor Watershed •Legacy Sediment Future Restoration Project
Results Sample Site:
Bridlewood Pool
Leadline
Walker
Spring Meadow
Floodplain:
Connected
Disconnected
Disconnected
Disconnected
Minimal
Development/ Ag
Development/ Ag
Legacy/ Mill Dam
Forested
Invasive Herbaceous
Mowed Lawn
Forested
Heavy
Heavy
Heavy
Heavy
Upper Pi U Pin A Average Y Yearly l Change Rate (cm/year):
9.0
16.8
18.1
19.3
Lower Pin Average Yearly Change Rate (cm/year):
17.8
20.0
20.7
76.1
Reach Average Yearly Change Rate (cm/year):
13.4
18.4
19.4
47.7
Sediment Impacts: Vegetation: Stormwater Impacts:
7
Bridlewood Pool 8
Spring Meadow -0 8
-0 8
Rainfall (cm)
D ec -0
8
No v08
O ct
Se p
A ug -0 8
Ju l- 0 8
Ju n08
M ay -0 8
A pr -0
8
-0 8
M ar -0
Fe b
Ja n08
D ec -0
No v07
Streambank C Change (cm/da ay) 0.3
0.25
0.2 5
0 15 0.15 4
0.1 3
2
0 05 0.05 1
0 0
Rainfalll (cm/day)
Average Streambank Change 8
7
6
Brandywine Valley Association 1760 Unionville-Wawaset Road West Chester, PA 19382 j [email protected] f @ t t (610) 793-1090 (610) 793-2813 fax
RETTEW Associates, Inc. Natural Sciences Group 950 East Main Street, Suite 220 S h lkill Haven, Schuylkill H PA 17972 (570) 385-2270 (570) 385-2217 fax
Brandywine Valley Association 1760 Unionville-Wawaset Road West Chester, PA 19382 (610) 793-1090 793 1090 (610) 793-2813 fax
RETTEW Associates, Inc. Natural Sciences Group 950 East Main Street, Suite 220 S h lkill Haven, Schuylkill H PA 17972 (570) 385-2270 (570) 385-2217 fax
Why?
Installed Pin Cross Section View
Transect Installation •Transect: 8 sets of bank pins, 10 m interval spacing on one bank •Representative sampling of bank stability and in-stream conditions •Pin #1: Just below the ordinary high water mark •Pin #2: 1/2 the distance from the ordinary high water mark to the topp of the bank •Pin #3: Control point on the top of bank
Data Analysis y •Sampled Monthly •Volunteer l data d entry into spreadsheet •Qualitative evaluation •Rainfall and bank erosion/ deposition change rate over time •Semi-quantitative comparisons of rainfall events and the bank erosion/deposition rate
Study Site Selection •Selected Four Sites Throughout Radley Run Watershed: •“Stable” Control Site •Impaired Site Selected for a Restoration Project •Typical Mowed Lawn where Volunteers Monitor Watershed •Legacy Sediment Future Restoration Project
Results Sample Site:
Bridlewood Pool
Leadline
Walker
Spring Meadow
Floodplain:
Connected
Disconnected
Disconnected
Disconnected
Minimal
Development/ Ag
Development/ Ag
Legacy/ Mill Dam
Forested
Invasive Herbaceous
Mowed Lawn
Forested
Heavy
Heavy
Heavy
Heavy
Upper Pi U Pin A Average Y Yearly l Change Rate (cm/year):
9.0
16.8
18.1
19.3
Lower Pin Average Yearly Change Rate (cm/year):
17.8
20.0
20.7
76.1
Reach Average Yearly Change Rate (cm/year):
13.4
18.4
19.4
47.7
Sediment Impacts: Vegetation: Stormwater Impacts:
7
Bridlewood Pool 8
Spring Meadow -0 8
-0 8
Rainfall (cm)
D ec -0
8
No v08
O ct
Se p
A ug -0 8
Ju l- 0 8
Ju n08
M ay -0 8
A pr -0
8
-0 8
M ar -0
Fe b
Ja n08
D ec -0
No v07
Streambank C Change (cm/da ay) 0.3
0.25
0.2 5
0 15 0.15 4
0.1 3
2
0 05 0.05 1
0 0
Rainfalll (cm/day)
Average Streambank Change 8
7
6
Brandywine Valley Association 1760 Unionville-Wawaset Road West Chester, PA 19382 j [email protected] f @ t t (610) 793-1090 (610) 793-2813 fax
RETTEW Associates, Inc. Natural Sciences Group 950 East Main Street, Suite 220 S h lkill Haven, Schuylkill H PA 17972 (570) 385-2270 (570) 385-2217 fax
