Infiltration ... soil type around the trench needs to allow water to travel at minimally 0.5 in/hr. Filtration systems such as this are prone to clogging with sediments suspended in the stormwater.

A french drain is a small trench filled with gravel ... of a hole in the ground that is lined with gravel or small rocks to ...

Refugee camps in Ethiopia need to be made more liveable. Creating wetlands to provide greenery, absorb flash floods and ...