What is the minimum thickness for topsoil in a filter bed?

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Multiple Choice

What is the minimum thickness for topsoil in a filter bed?

Explanation:
The depth of topsoil over a filter bed must be thick enough to support healthy plant growth and contribute to treatment through filtration and root activity. A minimum of 15 cm (about 6 inches) provides a sufficient root zone for grasses or other vegetation, helps with evapotranspiration, and protects the underlying gravel and pipes from erosion and surface disturbance. Too little topsoil, like 5 cm or 10 cm, would hinder plant establishment and increase the risk of erosion and clogging of the bed. A depth of 20 cm meets the requirement but isn’t the minimum.

The depth of topsoil over a filter bed must be thick enough to support healthy plant growth and contribute to treatment through filtration and root activity. A minimum of 15 cm (about 6 inches) provides a sufficient root zone for grasses or other vegetation, helps with evapotranspiration, and protects the underlying gravel and pipes from erosion and surface disturbance. Too little topsoil, like 5 cm or 10 cm, would hinder plant establishment and increase the risk of erosion and clogging of the bed. A depth of 20 cm meets the requirement but isn’t the minimum.

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