November 30, 2007

Please Post Your Answer to Worked Example 3.2

Please Post Your Answer to Worked Example 3.2

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November 30, 2007

kee1688 @ 12:33 pm

Group D

Tc = 11.77 min

At top water level:
Wtwl = 26m
Ltwl = 118m

Base:
Wb = 21m
Lb = 113m

Depth:
Settling zone y1 = 0.6m
sediment storage zone, y2 = 0.69m

Outlet riser diameter = 900mm
Adopt 5 rows of 11 x 25mm orifices with increment of 258mm.

Q10 = 5.46m3/s
Qspillway required = 4.53m3/s (with riser pipe head 0.3m)
Spillway head = 0.6m
Qspillway = 4.83m3/s

In summary, total basin depth = 2.19m

suhayati Abd Rahman @ 12:41 pm

Group E
Summary:
Tc = 11.77 min.
Settling depth = 0.6m
Sediment storage = 0.69m
Spillway height = 0.55m
Total basin depth = 2.14

suhayati Abd Rahman @ 12:54 pm

Group E (revised answer)
Summary:
Tc = 11.77 min.

Settling depth = 0.6m
W1=25m, L1=117.2m

Sediment storage = 0.69m
W2=23.8m , L2=116.0m

Outlet riser= 900mm diameter
Orifice dia=25mm with 5 rows x 11nos at spacing 250mm

Q10=4.76m3/s, Fd=1.446, C=0.881
Spillway height = 0.55m , base width=6.5m, Csp=1.62
Qspillway=4.30m3/s

Total basin depth(including spillway) = 2.14m

alexyap @ 1:12 pm

Group B answer)
Summary:
Tc = 11.77 min.

Settling depth = 0.6m
W1=25m, L1=117.2m

Sediment storage = 0.69m
W2=23.8m , L2=116.0m

Outlet riser= 1050mm diameter
Orifice dia=25mm with 5 rows x 11nos at spacing 258mm

Q10=5.46m3/s, Fd=1.11, C=0.88
Spillway height = 0.55m , base width=6.5m, Csp=1.6
Qspillway=4.24m3/s

Total basin depth(including spillway) = 2.14m

sean.leemw @ 1:25 pm

Tc = 11.77 min

Wtwl = 26m
Ltwl = 121m
Wb = 21m
Lb = 116m
Depth:
Settling zone y1 = 0.6m
sediment storage zone, y2 = 0.69m

Outlet riser diameter = 300mm
Adopt 6 rows of 9×25mm orifices with increment of 215mm.

Q10 = 5.97m3/s
Qspillway required = 5.87m3/s (with riser pipe head 0.3m)
Spillway head = 0.75m, width = 5.5m
Qspillway = 5.89/s

In summary, total basin depth = 2.34m

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November 30, 1999

Please Post Your Answer to Worked Example 3.2


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