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How to Size a Bioretention Basin: The 4% Rule and When It...

Reco Prianto, PE · April 02, 2026

Learn how to size a bioretention basin using the 4% rule, BASMAA calculator, and IMP worksheets. When the rule works—and when clay soils and high...

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Reco Prianto, PE

Reco Prianto, PE

Principal · Calichi Design Group

Licensed PE in eight states. 25 years of site civil and dry utility design.

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