proletariat
Civil/Environmental
- Apr 15, 2005
- 148
We often specify a temporary channel liner in a swale to prevent erosion.
Let's say that liner is a single-net straw blanket w/ a shear resistence of 1.55 psf.
Ideally, grass is going to grow in to replace the temporary liner. However, grass can have a shear resistence as low as 0.6 psf.
The implication is that the channel may be bumped up to requiring a permenant liner because stabilized grass fails the shear condition.
How are people handling this? Do you go with the permenant liner, or do you assume the channel will always and forever have the permissable shear value of the temporary liner?
Let's say that liner is a single-net straw blanket w/ a shear resistence of 1.55 psf.
Ideally, grass is going to grow in to replace the temporary liner. However, grass can have a shear resistence as low as 0.6 psf.
The implication is that the channel may be bumped up to requiring a permenant liner because stabilized grass fails the shear condition.
How are people handling this? Do you go with the permenant liner, or do you assume the channel will always and forever have the permissable shear value of the temporary liner?
