Question

Calculate the diameters of pipes AB and BC of the sewer system shown below, for a 50- year storm. Catchment Area (acres Runoff coefficientInlet time (min) 0.55 0.65 0.85 0.90 25 18 10 18 IV 27 PointElevation (ft) 882 859 835 ft AB BC 700 650 0.020 0.020 The IDF (intensity-duration-frequency) curve is given by: 1< 85 To3 where T is the return period in years, rainfall intensity in in/h is the storm duration in minutes and i is the Page 4

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Slon I ST SoJ as+ 27 ac, Cat chme aci 85. T 184 4 32, 2165catchot- I0 0.35 よ x 3600 o 35 2구ナ2구..fl Klg t a Elevall 8K 5 4131

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