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Lecture 14: Design Study 2 Millwood & Gaunless Flood Alleviation Schemes

Lecture 14: Design Study 2 Millwood & Gaunless Flood Alleviation Schemes. Dr Andrew Sleigh Dr Cath Noakes www.efm.leeds.ac.uk/CIVE/FluidsLevel1. Gather data Sketch layout marking levels Marking areas where volume calcs required Draw a cross section Identify levels in each region.

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Lecture 14: Design Study 2 Millwood & Gaunless Flood Alleviation Schemes

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  1. Lecture 14: Design Study 2Millwood & Gaunless Flood Alleviation Schemes Dr Andrew Sleigh Dr Cath Noakes www.efm.leeds.ac.uk/CIVE/FluidsLevel1

  2. Gather data • Sketch layout • marking levels • Marking areas where volume calcs required • Draw a cross section • Identify levels in each region

  3. Question 1 Data Required • Culvert Diameter 2.6 m • Number of culverts 2 • Maximum culvert velocity 1 m/s • 1 in 200 year design flow 48 m3/s • 1 in 1000 year design flow 242 m3/s

  4. Steps • Calc volume in rise from 123 to 127 m • Calc flow in culverts (Q=Av) • i.e. Flow out of the reservoir • Calc net inflow, Q = Qin – Qout • Qin = 48m3/s • Time = Volume / Q

  5. Steps • Calc volume in rise from 127 to 127 m • Calc flow in culverts (Q=Av) • i.e. Flow out of the reservoir • Calc net inflow, Q = Qin – Qout • Qin = 48m3/s • Time = Volume / Q 986 304 m3 10.62 m3/s 37.38 m3/s 26386 seconds 7 hours 20mins

  6. The Spillway

  7. Limiting velocity down spill way • Design for 1000 year flood gives 8m/s

  8. Question 2 Data • Spillway weir Cd 0.73 • Spillway weir width 150 m • 1 in 1000 year design flow 242 m3/s • Maximum velocity on spillway 8 m/s • Assume velocity on spillway is 4 times the velocity over the weir

  9. Steps • Calc allowable velocity over weir • Calc height • Use Q = Av = BHv • Calc height for a 1000 year flood • Q = 242m3/s • Calc Velocity over weir 2.0 m/s 0.861 m 0.5 m 1.96 m/s

  10. Diversion of culvert

  11. Question 3 Data • Water level above bend 13m • Flow velocity 1 m/s • Diameter 2.6m • Reduces to diameter 1.5m • Bend angle 45o • Assume atmospheric pressure 10m water

  12. Steps • Calc inlet pressure • Follow steps as in lecture examples 225 130 N/m2 402 kN/m2

  13. Today’s lecture: • Design Study • Used basic fluid mechanics seen in lectures • Sized and checked design • For more info: www.efm.leeds.ac.uk/CIVE/FluidLevel1/CaseStudies 22

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