2010 BRAE312 HW-3res-HazenW

2010 BRAE312 HW-3res-HazenW - Example Problem - 3...

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Example Problem - 3 Reservoirs Given: A three reservoir (branching pipe system) Elev A (ft) = 240 L1 (ft) = 4000 Elev C (ft) = 170 L2 (ft) = 3000 Dia 1 (in.) = 30 L3 (ft) = 1500 Dia 2 (in.) = 24 Q2 (CFS) = 7 Dia 3 (in.) = 18 Required: 1. Pressure at Junction 2. Elevation of Reservoir B Solution: Derivation of Velocity for 3 Reservoir Problem: Hazen Williams Friction Q (GPM) L (ft) ID (in) hf (ft) Rearranged for V (velocity) V (fps) D (ft) hf (ft) L (ft) Setting up a table for the pipe characteristics: Pipe 1 2 3 L (ft) 4000 3000 1500 D (ft) 2.5 2 1.5 C 130 130 130 Area 4.909 3.142 1.767 Setting up a table for Elev P iterations: Elev. P hf 1 = Elev. A - Elev. P hf 3 = Elev. P - Elev. C v1 v3 Q1 Q3 Q1-Q2-Q3 Move P ft ft ft ft/s ft/s CFS CFS CFS Up/Down 200 40 30 10.4557
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