Metric · draft
A measurable indicator (students often call it a KPI) used as evidence for a design decision.
| Category | Water |
| Unit | % of site |
| How it is calculated | Sealed (paved, built, roofed without retention) area ÷ total site area × 100. The permeable ratio is the complement. |
| Origin | student |
| Status | draft |
Also known as: Permeable surface ratio · Paved surface area · Paved (impervious) surface area · Share of site covered by built materials · Pervious surface gain · Sealed surface
What it measures
How much of the site sheds rainwater instead of letting it soak in.
Calculation
Sealed (paved, built, roofed without retention) area ÷ total site area × 100. The permeable ratio is the complement.
Connections
- Used in case studies: Adam Večeřa, Hynek Hrabík, Ilinca Maria Baciu, Julia Kopác, Natalie Žižková
- Tools that can calculate it: Grasshopper
- Informs decisions on: Stormwater and sealed surfaces on logistics sites, Land take of logistics buildings
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