Definition
Hard surfaces like pavement and roofs prevent water infiltration and increase runoff. Regulations limit impervious surface percentage to control stormwater impacts.
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Impervious surface percentage is regulated to control stormwater. Higher percentages increase runoff and flooding risk. Regulations limit impervious surface percentage for development. Permeable alternatives (permeable pavement) reduce impact. Impervious surface affects stormwater management costs.
Pro Tip
Use permeable alternatives where possible to reduce stormwater costs.
Example
Development with 40% impervious surface (houses, driveways, parking) subject to stormwater regulations.