rooftop perimeter basin
Rooftop perimeter basin vs French drain: The top two drainage strategies for suburban flood protection - myth-busting
Which System Keeps Your Basement Dry? In a 95th-percentile storm, a properly sized rooftop perimeter basin typically holds back about 85% of runoff, while a standard French drain diverts roughly 60%.1 Both are low-cost drainage options, but the basin’s larger capture area and gravity-fed design give it a