Greenfield run-off rate
The Home Quality Mark, defines the greenfield run-off rate as the rate of run-off that would occur from the site in its undeveloped and therefore undisturbed state.
The greenfield volume of run-off is the volume of run-off that would occur from the site in its undeveloped and therefore undisturbed state.
Ref Home Quality Mark One, Technical Manual SD239, England, Scotland & Wales, published by BRE in 2018.
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