Which factors need to be evaluated for the selection of ECB and TRM?

When selecting Erosion Control Blankets (ECB) and Turf Reinforcement Mats (TRM), it is crucial to evaluate shear stress and velocity because these factors directly influence the performance of erosion control products in various environmental conditions. Shear stress refers to the force exerted by water flow over a surface, while velocity indicates how fast that water is moving. Both of these parameters determine the suitability of a particular ECB or TRM for effectively protecting the soil from erosion during storm events or periods of heavy rainfall.

For instance, if the shear stress is high due to swift flowing water, a more robust and durable reinforcement material would be necessary to withstand those conditions. Similarly, the velocity of water can affect the entrenchment and anchoring of the ECB or TRM, impacting its long-term effectiveness. Evaluating these factors ensures that the selected erosion control measures will be adequate to mitigate erosion under anticipated conditions, thereby enhancing soil stability and preventing sediment runoff into waterways.

The other options, while relevant in different contexts, do not directly correlate with the immediate performance of ECB and TRM in relation to erosion control.