Hydroseeding and Erosion Control
Why is Erosion Control Important?
Cornell University conducted a study of soil erosion and found it to be the second biggest environmental problem behind population growth that humanity faces. The 2006 study also stated it costs the U.S. over 37 billion dollars per year. Imagine that number after being adjusted for inflation. While we don't believe the sky is falling, we do take soil erosion seriously. It can costs us time, money and of course our precious resource, topsoil. By preventing erosion you can prevent chemical and topsoil runoff into rivers and streams, stabilizing the groundwork around our homes and businesses.
Link to news article summarizing the study:
Hydroseeding for Erosion Control
Hydroseed is one of the methods used in erosion control. The mulch and tackifiers in the hydroseed slurry work to hold the soil in place, giving the seed a stable foundation to grow and establish roots. The roots grow into the soil acting as fingers to hold the soil in place preventing wind and water from removing topsoil. Hydroseeding can be used alone or in combination with other erosion control methods, such as erosion blankets or straw.
Slope Grades
Hydroseeding is most effective on slopes less than 3:1
Slope grades depicted in the image show slope grades from 1:1 to 5:1. Hydroseeding for erosion control is most beneficial on slopes with a gradient less than 3:1 although it is still considered the best way to seed steeper slopes. Erosion protection on steeper slopes may require different methods of erosion control beyond or in conjunction with hydroseeding. For more information about erosion control reference the Tennessee Erosion and Sediment Control Handbook... https://fs.utk.edu/wp-content/uploads/2020/04/Erosion-Control-Handbook-2.pdf
Slope Pre-Hydroseed
Hydroseeded Slope
Hydroseeded Slope
Hydroseeded Slope
This is a hydroseeded slope that had a gradient of around 1.5:1 (~65%). A heavier mulch application was applied with heavy tackifier. No erosion blankets were used. The picture was taken the day after hydroseed application.
90 day Result
Hydroseeded Slope
Hydroseeded Slope
The slope was inspected 90 days after application of the hydroseed slurry. Full growth with no obvious signs of erosion or landslide. During this time period there were at least two heavy rainfalls after the grass had germinated.