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18. Find the velocity of flow in a 460-mm (18-in) pipe flowing full at a slope of 2 percent. Mannings n is 0.010. 14. The upstream end of a 760-mm (30-in) pipe has an invert of 134.75 at the manhole. What invert should be used for the end of a connecting 460-mm (18-in) pips?
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