From Kevin Peterson
Construction Debris Management
The following statements were made concerning the erosion control socks manufactured by one of our customers in Roopville, Georgia. They are made to the exact specifications that Ever-Green Landscape Nursery and Supply Inc.'s erosion socks are made. We have worked with Natural Growth and Ever-Green Landscape Nursery and Supply Inc. to assure conformance to the exact specifications needed for the erosion control socks to perform correctly.
All the socks laid and reviewed by Mr. Hamil and Mr. Blackley were installed with no stakes involved. The composition of the sock (the wood mulch installed in a filter sock) produces a 3 tiered filter consisting of the first side of the sock the water contacts, the wood filler material inside the sock and the back side of the sock the water exits from. Because of the ability to effectively filter the water at a fast pace the hydraulic pressure on the erosion control sock is greatly reduced which limits the amount or need of stakes.
Because of the three tiered filtering it is always advised to not drive stakes through the erosion control sock due to the damage to the filtering ability of the sock. If stakes are to be used in a high flow area or on a hillside it is highly recommended to place the stakes on the downhill side at a 30 to 45 degree angle with the sock resting up against the stakes.
These erosion control socks are used around the country with great success of which over 90% are not staked in to position.
"I am a retired Ga. DOT engineer. I was Assistant Urban Design Engineer for many years in charge of designing the Freeing the Freeway projects in Atlanta and many other projects in major cities in Georgia. The last two years of my career I was State Highway Planning Engineer. I have had many experiences with trying to curb erosion on projects with silt fences, detention ponds and building wet lands We were always concerned with the use of silt fences in area of clay soils. We found that the clay stopped up the silt fences and water flowed over them or if they did not have wire fencing behind them they would over turn. They proved to be unsatisfactory in my opinion because they failed and required a lot of maintenance to keep them viable.
I have visited several sites after heavy rains where Natural Growth Erosion Control Socks were used and found them to be a much better system of erosion control. They can be used in more places than silt fence and can be temporarily moved during construction. The socks filter the water much better. The socks remain in place and contractors do not have to worry about the sock moving.
They do not require as much maintenance as the silt fence.
They are being used by a lot of state in lieu of the silt fence."
Kirby D. Hamil P.E.
"I concur with Mr. Hamil.
Several years ago we had Natural Growth install several test sections in locations which Type C fence had failed repeatedly. Skeptical at first, we noticed that the units actually filtered the water while maintaining their integrity thru heavy storm events. The socks provide the ability to install/remove without disturbing soil, are mobile, and eliminate the problem with landfill disposal after their use. We have specified, installed, monitored the socks on several projects in the past few years with excellent results. I urge my clients to use the socks instead of conventional silt fence as feasible."
Rodney G. Blackley PE.
To help protect the waters of Iowa. "Everyone lives downstream."