Erosion control blankets (ECBs) are an essential tool for mitigating soil erosion and fostering vegetation growth on construction sites and other disturbed landscapes. These blankets protect the soil from the impact of rain and water flow, creating a stable environment for seeds to germinate and plants to establish. Here, we dive into the fundamentals, types, and best practices for using erosion control blankets effectively. 

 

What Are Erosion Control Blankets? Erosion control blankets are protective coverings made from organic or synthetic materials designed to prevent soil erosion while promoting vegetation growth. Think of them as a "sandwich": the outer layers are netting that holds the inner material—made of fibers such as straw, coconut, or wood—in place. This combination absorbs the impact of raindrops, reduces runoff, and helps anchor seeds to the soil. 

Key Benefits of Erosion Control Blankets: 

  • Erosion Prevention: Protects soil from dislodgement caused by rain or flowing water. 

  • Vegetation Support: Creates a conducive environment for seed germination and plant growth. 

  • Soil Stabilization: Keeps topsoil intact, preventing sediment loss and water pollution. 

 

Types of Erosion Control Blankets Erosion control blankets vary in materials, longevity, and application. Selecting the right type depends on the site’s slope, soil type, and project requirements. 

  1. Degradable Blankets: 

  • Made from natural fibers like straw, wood excelsior, or coconut (coir). 

  • Designed to degrade as vegetation becomes established. 

  • Longevity ranges from three months to five years, depending on material and climate. 

  1. Turf Reinforcement Mats (TRMs): 

  • Permanent solutions made from synthetic materials. 

  • Combine with plant roots to withstand high water shear forces, particularly in channels. 

  • Ideal for areas needing long-term stabilization. 

  1. Jute matting: 

  • Woven from jute fibers, a natural and biodegradable material. 

  • Commonly used for temporary erosion control on moderate slopes. 

 

How to Install Erosion Control Blankets Proper installation is critical to the effectiveness of erosion control blankets. Here’s a step-by-step guide: 

  1. Site Preparation: 

  • Ensure the soil is smooth and free of debris, rocks, and large clumps. 

  • Add soil amendments, such as fertilizer or compost, if necessary. 

  1. Seeding: 

  • Spread seeds and initial fertilizers over the prepared soil. 

  1. Blanket Placement: 

  • Unroll the blanket over the seeded area, ensuring it lies flat against the soil. 

  • Overlap edges by at least 6 inches to prevent gaps. 

  1. Anchoring: 

  • Secure the blanket with U-shaped staples or pins, spaced according to manufacturer guidelines. 

  • Pay special attention to anchoring at the edges and where water flows onto the blanket. 

 

Common Questions About Erosion Control Blankets 

  1. How Long Do Erosion Control Blankets Last? 

  • Longevity depends on the material. Straw blankets typically last up to 12 months, while coir blankets can last three to five years. 

  1. Can You Mow Over an Erosion Control Blanket? 

  • Yes, but ensure the blanket is well-anchored to prevent netting from getting caught in mower blades. 

  1. Are Erosion Control Blankets Environmentally Friendly? 

  • Natural fiber blankets are biodegradable and will not leave any plastics in the ground. Turf Reinforcement mats are designed to last long term in the ground and therefore are made from Polypropylene. Synthetic options may persist longer but can offer superior strength in high-stress areas and give better environmentally sound options than concrete or hard armor.  

 

  1. What is better for controlling erosion, erosion control blankets or hydroseeding? 

There are pros and cons to both technology  

Pros of blankets include 

  1. The mulch is held together by a physical net and less prone to erosion and movement of that protective mulch 

  2. Easy to apply on prepared soil on slopes up to 1:1  

  3. No need for expensive equipment to apply. This can be done with minimal installation equipment.  

  4. Used in channels and areas where there is flowing water. 

  5. Wide variety of different longevity and strengths.  

  6. 100% mulch coverage.  

 

Pros of hydroseeding 

  1. Can be applied on uneven and steep surfaces 

  1. One step process of applying the mulch, seed, fertilizer, and soil amendments.  

  1. Less labor required to cover larger area 

 

Disadvantage of Erosion Control Blankets 

  1. Can not be used on uneven surfaces 

  1. Netting can be caught in mowers if not properly secured to the ground.  

  1. Wildlife entrapment may occur with plastic nets if not installed properly.  

 

Disadvantage of Hydroseeding 

 

  1. Not held together with a physical structure like a net. Hydroseeding relies on glues to hold the fibers together.  

  1. Need specialized equipment for installation 

  1. Need large volumes of water.  

  1. Application rate will vary as the final product is made on site.  

  1. Poor application may cause areas that are not protected.  

 

 

Best Practices for Using Erosion Control Blankets 

  • Choose the right blanket for your site’s specific needs. 

  • Ensure proper soil preparation to maximize vegetation establishment. 

  • Regularly inspect the blanket post-installation to address any lifting or gaps. 

  • Use additional erosion control measures, like mulch or hydroseeding, for enhanced effectiveness on steep slopes or in high-risk areas. 

 

Conclusion Erosion control blankets are a versatile and effective solution for managing soil erosion and promoting vegetation growth. Whether you’re stabilizing a steep slope or protecting a newly seeded area, these blankets provide the support and protection necessary for successful site rehabilitation. By selecting the right type and following best practices for installation, you can ensure a sustainable and cost-effective outcome.