March 22, 2007

Today is Workshop No. 3

Hi All,

Today is Workshop No. 3.

Workshop No. 1 was completed yesterday and the winning team is Team 1 (members: Wong Wing Keng, Rosmina, Roslan and Yazdi). See post below for the score.

Day 1 of the workshop is going on now.

Please post your answers to the worked examples as comments to this post.

Answers:
Worked Example 4.2- 4 m x 1.8 m Box Culvert
Worked Example 4.3- 2 x 1.5 m diameter
Worked Example 3.2- Total Basin Depth= 2.19 m
Worked Example 3.4- Total Basin Depth= 1.45 m

Winners:
Worked Example 4.2- Team 3, 1, 4, 2
Worked Example 4.3- Team 3, 1, 4, 2
Worked Example 3.2- Team 1, 4, 3, 2
Worked Example 3.4- Team 2, 3, 1,4

Congratulation, Group 3 is the winner!

Group 3 members are: Rusman, Nooridayu, Fuad and Liew T M.

Here is a gift for all winners- an article by Steve Jobs, CEO Apple:

Stay Hungry, Stay Foolish!

Regards,

Dr. Quek Keng Hong

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Comments on Today is Workshop No. 3 »

March 22, 2007

nooridayu mat ripin @ 5:16 pm

Group 3

Minor Primary Outlet = 0.6m x 0.6m BC, Q=0.82m3/s
Major Primary Outlet = 0.75m x 0.75m BC, Q=0.99m3/s

Datum = 100 m RL
5 yrs WL = 101.0m RL
50 yrs WL = 101.25m RL
Embankment crest = 101.55m RL

March 23, 2007

Rose Bustami @ 11:44 am

Group 1:

In summary,
Settling depth (m)= 0.6
Sediment storage depth (m)= 0.69
Riser head (m)= 0.3
Spillway head (m)= 0.6
Total basin depth including the spillway is (m)=2.19

At top water level:
Wtwl (m)= 26
Ltwl (m)= 118
Base:
Wb (m)= 21
Lb (m)= 113
Depth:
Settling zone, y1 (m)= 0.6
Sediment storage zone, y2 (m)= 0.69
Side slope, Z= 2

christopher @ 11:44 am

WE 3.2
ans:Total basin depth including the spillway is (m)= 2.19

christopher @ 11:46 am

WE 3.2
ans: Qp (m3/s)=5.46

Rose Bustami @ 11:47 am

Hence Qp (m3/s)= 4.50
Riser pipe head (m)= 0.3
Qriser (m3/s)= 0.93
Qspillway (m3/s)= 3.57
Spillway calculation:
Try spillway basewidth, B (m)= 6.5
Try effective spillway head, Hp (m)= 0.5
Csp (Spillway disch coeff from Design Chart 20.2)= 1.65
Qspillway (m3/s)= 3.79 OK

Mohd Fuad @ 11:47 am

from Group 3

Hence Qp (m3/s)= 4.87
Riser pipe head (m)= 0.3
Qriser (m3/s)= 0.93
Qspillway (m3/s)=3.94
Spillway calculation:
Try spillway basewidth, B (m)= 6.5
Try effective spillway head, Hp (m)= 0.55
Csp = 1.58
Qspillway (m3/s)= 4.19 OK

In summary,
Settling depth (m)= 0.6
Sediment storage depth (m)=0.69
Riser head (m)= 0.3
Spillway head (m)= 0.55
Total basin depth including the spillway is (m)= 2.14

ksyeap @ 11:48 am

Hence Qp (m3/s) = 5.10
Riser pipe head (m)= 0.3
Qriser (m3/s) = 0.93
Qspillway (m3/s) = 4.18
Spillway calculation:
Try spillway basewidth, B (m)= 6.5
Try effective spillway head, Hp (m)= 0.55
Csp = 1.65
Qspillway (m3/s)= 4.37 OK

In summary,
Settling depth (m)= 0.6
Sediment storage depth (m)= 0.69
Riser head (m)= 0.3
Spillway head (m)= 0.55
Total basin depth including the spillway is (m)= 2.14

Mohd Fuad @ 11:50 am

I think Csp value for Hp 0.50 is 1.55 not 1.65

chanhoong @ 12:18 pm

In summary,
Settling depth (m)= 0.6
Sediment storage depth (m)= 0.35
Spillway head (m)= 0.45
Total basin depth including the spillway is (m)= 1.4

chanhoong @ 12:20 pm

Sorry mates, the answers poster by me @ time 12:18 earlier was an accidental entry. Just ignore it.

rosy @ 1:18 pm

rosy says:

Detention pond Ex 2.3
minor outlet:0.6×0.6 (5 yrs Q pre)WL 101.0M
major outlet:0.75×0.5 (50 yrs Qpre)WL 101.25M

1)spillway design limit??
2)Can the minor and major outlet be replaced by a V-Notch weir..

chanhoong @ 1:34 pm

Answers from group 2 on question 3.4

Overall Basin Dimensions:
At top water level:
Wtwl (m)= 22
Ltwl (m)= 119
Base:
Wb (m)= 18
Lb (m)= 115
Spillway base width, B (m)= 6
Side slope, Z= 2
Depth:
Settling depth (m) = 0.6
Sediment storage depth (m)= 0.35
Spillway head (m) = 0.5
Total basin depth including the spillway is(m)= 1.45

LIEW TIAM MING @ 1:40 pm

Answer from Group 3.

At top water level:
Wtwl (m)= 26
Ltwl (m)= 92
Base:
Wb (m)= 22
Lb (m)= 88
Depth:
Settling zone, y1 (m)= 0.6
Sediment storage zone, y2 (m)= 0.35
Side slope, Z= 2

Hence Qp (m3/s)= 3.02
Qspillway (m3/s)= 3.02
Spillway calculation:
Try spillway basewidth, B (m)= 7
Try effective spillway head, Hp (m)= 0.5
Csp (Spillway disch coeff from Design Chart 20.2)= 1.53
Qspillway (m3/s)= 3.79

In summary,
Settling depth (m)= 0.6
Sediment storage depth (m)= 0.35
Spillway head (m)= 0.5
Total basin depth including the spillway is (m)= 1.45

Rose Bustami @ 1:42 pm

Group 1:

Total basin depth including the spillway is (m)=
1.45

Qp (m3/s)= 3.46
Qspillway (m3/s)= 3.86 OK

christopher @ 1:42 pm

WE 3.4
Ans:
Hence Qp (m3/s)=3.46
Qspillway (m3/s)=3.46
Spillway calculation:
Try spillway basewidth, B (m)=6.5
Try effective spillway head, Hp (m)=0.5
Csp (Spillway disch coeff from Design Chart 20.2)=1.55
Qspillway (m3/s)=3.56 OK

In summary,
Settling depth (m)=0.6
Sediment storage depth (m)=0.35
Spillway head (m)=0.5
Total basin depth including the spillway is (m)=1.45

chanhoong @ 2:05 pm

Group 2 answers to question 3.5

Overall Basin Dimensions:
At top water level:
Wtwl (m)=14
Ltwl (m)=112
Base:
Wb (m)= 8
Lb (m)= 107
Side slope, Z= 2
Spillway
Try spillway basewidth, B (m)=10
Try effective spillway head, Hp (m)=0.15

Depth:
Settling depth (m)=0.6
Sediment storage depth (m)=0.8
Riser head (m)= 0.3
Spillway head (m)=0.15
Total basin depth including spillway is(m)=1.85

Rose Bustami @ 4:38 pm

Group 1

ex 4.2: box culvert
size : twin box 2.5 x 1.5
INLET Control
HW: Q50 = 2.18 m
Q100 = 2.57 m

christopher @ 4:38 pm

WE 4.2
Ans: B (M) D (M) HW (M)
4.0 1.5 2.25
2.78

WE 4.3
Ans: B (M) D (M) HW (M)
2.5 1.5 1.58
1.80

chanhoong @ 4:39 pm

Answers from group 2 for Q4.2 and Q4.3

Q4.2: Box Culvert 2.5m x 2.5m
Head Water 3.65 for Q50 and 3.75 for Q100
Inlet Control
Sub-Critical Flow

Q4.3: Pipe Culvert diameter 1.7m
Head Water 2.24m for Q50 and 2.52 for Q100
Inlet Control - Sub-critical Flow

Rose Bustami @ 4:41 pm

ex 4.3 : pipe culvert
size: twin pipe 1.5 m
INLET Control
HW: Q50 = 1.5 m
Q100 = 1.79 m

christopher @ 4:43 pm

WE 4.3
answer
dia 1.5m Hw 1.65, 1.82

jkthum @ 4:44 pm

Work example 4.2:
reqmnt: HW

LIEW TIAM MING @ 4:44 pm

Group 3,

Answer for Work Example 4.2:
Culvert Size B=4.0m and D=1.8m.
50 Year ARI as follow:
HWi > HWo
2.43 > 2.34

100 Year ARI as follow:
HWi > HWo
2.93 > 2.66

jkthum @ 4:52 pm

eg 4.2
box 3.3×2.5
hw for q100 = 2.95

nooridayu mat ripin @ 5:01 pm

Group 3,

Group 3
Answer for Work Example 4.3:
Pipe Culvert size 2 x 1.5m
50 Year ARI as follow:
HWi > HWo
1.50 > 1.47

100 Year ARI as follow:
HWi > HWo
1.73 > 1.62

LIEW TIAM MING @ 5:09 pm

Group 3
Answer for Work Example 3.5:
Total basin depth including spillway is(m)=1.92

Answer for Work Example 3.6:
Total basin depth including spillway is(m)=1.25

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