Calculate Fall
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Results
Minimum Fall
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Grade
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Pipe Size
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Distance
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Note: These are minimum grades per AS 3500.2 Table 3.4.1. Always verify with your local water authority requirements.
AS 3500.2 — Table 3.4.1 Quick Reference
| Pipe Size | Min Grade | Fall / metre |
|---|---|---|
| DN 40 | 2.50% | 25.0 mm |
| DN 50 | 2.50% | 25.0 mm |
| DN 65 | 2.50% | 25.0 mm |
| DN 80 | 1.65% | 16.5 mm |
| DN 100 | 1.65% | 16.5 mm |
| DN 125 | 1.25% | 12.5 mm |
| DN 150 | 1.00% | 10.0 mm |
| DN 225 | 0.65% | 6.5 mm |
| DN 300 | 0.40% | 4.0 mm |