03
How to Calculate Permeable Area Ratio
Divide permeable area by lot area and multiply by 100.
Permeability = permeable area ÷ lot area × 10004
What Is Permeable Area?
In general, it is an area that allows water infiltration. Legal criteria vary.
05
Does Permeable Paving Count?
It may count fully, partly or not at all, depending on the municipality and system.
06
Why Requirements Vary
Local environmental and planning conditions lead municipalities to adopt different definitions and thresholds.
FAQ
Frequently Asked Questions
Does this tool confirm project approval?+
No. It performs mathematical calculations using supplied values and does not replace municipal law, professional analysis or official approval.
Are the parameters the same across Brazil?+
No. Zoning limits and definitions vary by municipality, zone and the applicable version of local rules.