01
Formula
The mathematical relationship is a percentage.
TP = permeable area ÷ lot area × 10002
Example
60 m² of permeable area on a 300 m² lot equals 20%.
03
Surfaces and Materials
Natural soil, landscaping and drainage systems may be classified differently.
04
Local Rules Control
Confirm percentages and equivalency factors with the municipality.
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.