Grade Your Land

Retention grading is a method of sloping an area of land to create lowered areas that can retain and absorb rainwater.

Used with or without berms this practice reduces runoff and increases absorption by the ground. It works best in highly permeable soil.

On properties with less absorbent soil, the lowered area can be underlaid with gravel to increase the site's holding capacity and the amount of water that eventually sinks into the ground. Note that for this infiltration technique, it is highly recommended to first determine the soil permeability.

See an example

TreePeople implemented retention grading at the Hall House, a residential home in South Los Angeles. The project was one of our demonstration sites.

Is this practice right for you?

Consult a professional if you're not sure. Also, see our web pages discussing maintenance issues, costs and other factors.