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EXAMPLE OF COURSEWORK

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  1. EXAMPLE OF COURSEWORK

  2. Siphon Spillway Design EXAMPLE: • Full resevoir level (m) = 200 • Level of the centre of the outlet (m) = 195 • High flood discharge (m3/s) = 580 m3/s • Bed level of the river (m) = 180 • Base width of the body wall (m) = 7 • High flood level (m) = 210 • Cd (siphon discharge freely) = 0.6

  3. Solution: • From the information above, we can determine the number of siphon units required to pass the flood safely. • Calculate maximum operative head, H • H = High flood level – Level of centre of siphon outlet • = 210 – 195 • = 15 m • 2. Calculate full pipe discharge, • q=Cd x A x [(2gH)^0.5] • *Cd, siphon coefficient is given 0.6 • *Assuming the dimension of throat, width 4m x height 2m • *H is the maximum operative head.

  4. q=Cdx A x [(2gH)^0.5] q=0.6 x 8 x [(2x9.81x15)^0.5] = 82.3 m3/s Number of units required, No. of units = High flood discharge / full pipe discharge = 580 / 82.3 = 7 units

  5. Stilling basin

  6. Sewerage system design

  7. manhole manhole manhole manhole Pipe length 2-3 Pipe length 1-2

  8. STEP 1

  9. Step 4 Step 5 Step 1 Step 2 Step 3 Step 6

  10. Step 4 Step 5 Step 1 Step 2 Step 3 Step 6

  11. Step 10 Step 11 Step 13 Step 7 Step 8 Step 12 Step 14 Step 9

  12. Step 20 Step 16 Step 17 Step 21 Step 15 Step 22