NZ Certifying Drainlayer Practice Questions - NZ PGDB Certifying Drainlayer Examination Exam

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A DN150 foul-water drain has a calculated load of 600 discharge units. Under G13/AS2 Table 2, what is the flattest listed gradient that can carry that load?

1 in 120 1 in 140 1 in 160 1 in 180

Correct Answer:

1 in 160

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