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Note: 40Ø is the minimum orifice size acceptable for underground detention systems and 20Ø is the minimum pipe size for rainwater tank orifices. 10.1.2 Worked example: Orifice sizing A typical 2 unit site has a modified calculated PSD of 5.95 L/s (refer section 9.3.1), a level difference of 0.80m from invert level of orifice to top of weir. ................
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