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LoginDiameter of sewer(mm) Minimum gradient
100 1 in 57
150. 1 in 100
200. 1 in 145
230. 1 in 175
250. 1 in 195
300. 1 in 250
For 100mm 1 in 60
For 150mm 1 in 100
For 200mm 1 in 120
Keep that data in your mind