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There is no percentage, it is worked out on a ratio of 1:40 (meters)

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Wiki User

15y ago
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David Davids

Lvl 5
3y ago

jeezusss. 1:40 can be expressed as 2.5 PERCENT

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Anonymous

Lvl 1
4y ago

1/40 fall

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Q: How do you work out drainage fall by percentage?
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