November 29, 2007

Please Post Your Answer to Worked Example 2.4.

Please Post Your Answer to Worked Example 2.4 here.

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November 29, 2007

alexyap @ 6:27 pm

group B

answer

5yr pre dev outflow limit = 9.20 m3/s
50yr pre dev outflow limit = 13.49 m3/s

Using culvert size 0.8m x 2.2m and routing 5yr 60min for minor design storm primary outlet gives max. discharge of 8.6m3/s at WL=101.75m, less than outflow limit = 9.20 m3/s

Using culvert size 0.75m x 3m for major design storm primary outlet and routing 50yr 60min gives max. discharge of 13.15 m3/s at WL=102.25m, less than outflow limit 50ARI = 13.49 m3/s

After routing 100ARI 60min, the secondary spillway outlet was required at WL=102.25m with a discharge of 14.9m3/s. Therefore it was placed at WL=102.55m (0.3m above 50ARI WL) at a width of 3m and freeboard of 0.3m

November 30, 2007

LIEW TIAM MING @ 8:37 am

Group E
minor design storm: Q5 30 min
Q5=5.614m3/s < 5.76m3/s pre dev ,WL=101.5m
Culvert size:2.5m x 0.8m add factor
3 time for the stage storage.
Major design storm:Q50 30 min
Q50=8.631m3/s < 9.25m3/s pre dev, WL=101.75m
Culvert size:6.0m x 0.6m
Emergency Spillway: no 100 ARI
Just provide spillway at level=101.75+0.3=102.5
size :L=3m

suhayati Abd Rahman @ 8:40 am

Group E
minor design storm: Q5 30 min
Q5=5.614m3/s < 5.76m3/s pre dev ,WL=101.5m
Culvert size:2.5m x 0.8m add factor
3 time for the stage storage.
Major design storm:Q50 30 min
Q50=8.631m3/s < 9.25m3/s pre dev, WL=101.75m
Culvert size:6.0m x 0.6m
Emergency Spillway: no 100 ARI
Just provide spillway at level=101.75+0.3=102.5
size :L=3m

alexyap @ 4:25 pm

group B

answer

5yr pre dev outflow limit = 9.46 m3/s
50yr pre dev outflow limit = 15.6 m3/s

Using culvert size 0.7m x 2m and routing 5yr 60min for minor design storm primary outlet gives max. discharge of 9.43m3/s at WL=102m, less than outflow limit = 9.46 m3/s

Using culvert size 0.75m x 4m for major design storm primary outlet and routing 50yr 60min gives max. discharge of 13 m3/s at WL=102.25m, less than outflow limit 50ARI = 15.6 m3/s

The secondary spillway outlet was placed at WL=102.55m (0.3m above 50ARI WL) at a width of 3m and freeboard of 0.3m

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