Geosynthetics in erosion control

The ultimate goal of erosion control on most constmction sites is to prevent soil and seed loss from areas of soil disturbance until the seed can germinate and establish. Thus, most erosion control systems are temporary in scope and are used to hold the seed and soil in place until the required coverage of vegetation is achieved. However, some erosion control systems are intended to be permanent. These systems remain permanently in place, reinforcing the vegetation long after establishment. 

There are two categories of erosion control products. The first is termed temporary or degradable and the second is termed long-term or nondegradable. 

Advantages and disadvantages of the various systems are detailed in Tables 24.1 and 24.2. Following are brief descriptions of each geosynthetic-enhanced system (Figs. 24.1-24.14). 

Loose and hydraulically applied mulch Lowest cost well accepted high installation rate moderate sediment yield moderate vegetative density Very temporary (less than a few weeks/months) no concentrated flows dusty requires anchoring (crimping, tackifier) may require noxious weed certification 

Fiber roving systems Low to moderate cost high subgrade conformance very low sediment yield very good vegetative density Temporary (1—2 years) low to moderate flows only special equipment required 

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