Alternative/Innovative Technologies for Erosion, Sediment, and Turbidity Control - PowerPoint PPT Presentation

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Alternative/Innovative Technologies for Erosion, Sediment, and Turbidity Control

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Title: Alternative/Innovative Technologies for Erosion, Sediment, and Turbidity Control


1
Alternative/Innovative Technologies for Erosion,
Sediment, and Turbidity Control
  • Rich McLaughlin
  • Soil Science Department
  • rich_mclaughlin_at_ncsu.edu
  • North Carolina State University

2
New and Improved Devices/Systems
  • Erosion Control
  • Surface Outlets
  • Baffles
  • Turbidity Reduction
  • Other Innovations

3
Ground Covers
  • Vegetation establishment is the goal
  • Ground cover protects soil before grass emergence
  • Types
  • Straw mulch
  • Hydraulically applied mulch
  • Erosion Control Blankets

4
Straw Mulch
  • 1 - 2 tons/acre

5
Straw Mulch High Failure Rate
Patching w/ Blanket
6
Hydraulically Applied Mulch
  • Wood fiber
  • 1500 lbs/acre
  • with or without PAM
  • Bonded Fiber Matrix (crimped wood fiber PAM)
  • 2500-3500 lbs/acre
  • 21 slopes?

7
Usually Need Up and Down Application
8
Erosion Control Blankets
  • Straw
  • Jute
  • Excelsior (wood shavings)
  • Coir (coconut)
  • Nettings
  • Biodegradable
  • Photodegradable
  • Permanent

9
Erosion Control Ground Cover Demonstrations
Hydroseed
Compost
Straw
10
Field and Laboratory Testing
11
Ground Covers with/without PAM (20 lb/acre)
12
One Failure Begets Another
13
Surface Outlet (Skimmer)
14
Skimmer Diagram
15
Flashboard Riser Outlet
  • Adjustable standing pool
  • Can empty for sediment removal

16
Example of a Flashboard Riser Installation
Isolated View
Cross-sectional View
Flashboard Riser
Gravel Fill for Riser Access
Water Level
Solid Earthen Dam
Removable Stop Logs
17
Baffles
Porous
Silt Fence/Weir
18
Porous Baffle
Fence Design
Support Posts, 12 into Bottom or Side
Support Rope or Wire to Prevent Sagging
Stake to Support Wire
Sawhorse Design
Porous fabric attached with zip ties and stapled
to bottom in front.
2 x 4 Wood
Rebar into basin bottom.
Flow
19
PAM for Turbidity Control
20
PAM (polyacrylamide) Facts
  • Long-chain polymer with a net-negative charge
    (anionic).
  • Very low acute toxicity.
  • Used for water treatment (drinking/wastewater,
    industrial) and food processing.
  • Comes in powder, solid block, solution, or
    emulsion formulations.
  • Binds suspended solids together in flocs which
    can settle out of the water.

21
(No Transcript)
22
Ditch Checks and Floc Log in Pipe
23
More PAM Spots
24
In-Stream Treatment
25
PAM Sediment Bag
26
Injected PAM Corrugated Pipe
1226
27
Pump Into Pipe w/ Solid PAM
28
DOT Experimental Basin Design
29
Maximum Sediment Control
30
Two Stage Treatment
Sediment
Turbidity
31
Keys to Making PAM Logs/Powder Work for You
  • Match PAM to your soil or suspended sediment and
    water chemistry.
  • Reduce sediment load prior to PAM treatment.
  • Keep the PAM moist.
  • Create high flow onto PAM.
  • Create high mixing (turbulence) after PAM.
  • Allow for settling post-treatment.

32
Questions?
33
Alternatives to Rock Check Dams
34
Ditch Checks and Lining to Reduce Erosion
35
Baffle Testing
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