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It generally refers to a ratio of the 'fall' in drainage from the insert or 'inlet' to the 'outlet' calculated byusing fall = ratio X distance
1:40 would be 1/40 = 0.025 - assume a 3 meter distance for eg sake.
fall = 0.025 X 3
fall = 0.075 or 75mm from the inlet to the outlet.
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∙ 13y ago
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