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Typical commercially available pipe sizes include: 32Ø, 40Ø, 50Ø, 65Ø, 80Ø, 90Ø, 100Ø or 150Ø. Note: 40Ø is the minimum orifice size acceptable for underground detention systems and 20Ø is the minimum pipe size for rainwater tank orifices. ................
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