Upload
jennifer-pearson
View
49
Download
3
Embed Size (px)
DESCRIPTION
main drain calculation
Citation preview
References : Urban Stormwater management manual
Table of Average Rainfall Intensity (mm/hr)
for Kuala Lumpur referred to table 13.A1
For Rainfall Duration > 30 minutes
referred to equation 13.2
Storm Duration , tc (mins)
ARI (year) 15 18 20 22 24 26 28 30 32 33 37 38 40 42 44 46 48 50 52 54 56 58 60
2 139.5 128.6 122.3 116.7 111.6 107.0 102.9 99.0 95.5 93.8 87.8 86.4 83.8 81.4 79.1 76.9 74.9 73.0 71.2 69.5 67.8 66.3 64.8
5 166.5 153.6 146.2 139.4 133.3 127.7 122.6 117.9 113.5 111.5 104.1 102.4 99.1 96.1 93.3 90.6 88.1 85.8 83.5 81.4 79.4 77.5 75.7
10 182.5 169.0 161.1 153.8 147.1 141.1 135.5 130.4 125.6 123.4 115.2 113.3 109.7 106.4 103.3 100.4 97.6 95.0 92.5 90.2 88.0 85.9 83.9
20 199.8 185.0 176.2 168.2 160.9 154.2 148.1 142.4 137.2 134.7 125.7 123.7 119.8 116.1 112.7 109.4 106.4 103.5 100.8 98.3 95.8 93.5 91.3
50 217.3 202.1 192.9 184.4 176.6 169.4 162.8 156.6 151.0 148.3 138.4 136.2 131.9 127.8 124.1 120.5 117.2 114.0 111.0 108.2 105.5 103.0 100.5
100 240.5 223.2 212.8 203.3 194.5 186.5 179.1 172.2 165.9 162.9 152.0 149.5 144.8 140.3 136.1 132.2 128.5 125.0 121.7 118.6 115.7 112.9 110.2
For Short Rainfall Duration < 30 minutes
referred to equation 13.3, 13.4 and table 13.3
value of 2
P24h= 100 (KUALA LUMPUR).
Storm Duration , tc (mins)
ARI (year) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
2 212.5 201.5 193.7 187.8 183.3 179.6 171.3 164.4 158.5 153.5 149.1 143.6 138.7 134.4 130.5 127.0 123.0 119.4 116.0 113.0 110.2 107.6 105.2 103.0 101.0 99.0
5 288.1 266.9 251.8 240.5 231.7 224.6 213.0 203.3 195.1 188.1 182.0 174.8 168.4 162.7 157.7 153.1 148.1 143.5 139.3 135.5 132.0 128.7 125.7 122.9 120.3 117.9
10 315.3 292.7 276.5 264.4 255.0 247.4 234.7 224.1 215.2 207.5 200.9 192.9 185.9 179.7 174.2 169.2 163.6 158.6 154.0 149.8 145.9 142.3 139.0 135.9 133.0 130.4
20 352.4 325.8 306.9 292.7 281.6 272.8 258.5 246.6 236.6 228.0 220.5 211.7 203.9 197.0 190.8 185.3 179.2 173.6 168.5 163.9 159.6 155.6 152.0 148.6 145.4 142.4
50 385.3 356.6 336.1 320.8 308.8 299.3 283.7 270.7 259.8 250.3 242.2 232.5 224.0 216.5 209.7 203.6 196.9 190.8 185.2 180.1 175.4 171.1 167.1 163.4 159.9 156.6
100 432.3 398.8 374.9 356.9 342.9 331.8 314.2 299.6 287.2 276.6 267.4 256.7 247.2 238.7 231.2 224.4 217.0 210.2 204.0 198.3 193.1 188.3 183.8 179.7 175.8 172.2
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : 00109 / Meseba YauTY
page Main Drain capacity Ogos 02
of main drain A1 REF.
Main Drain A1 - Computation of Section Capacity
drainage reserve = 3.0 m 0.6 m PC Block Drain
alow freeboard = 0.3 m area,Ap = 0.2541 m
perimeter, Pp = 1.45 m
drain gradient , S =1/ 200
Bottom section n = 0.015 stone pitching
Side wall slope: 1/sw1= 0.50 drain
drain depth, D1 = 1.30 m
drain width, W = 1.2 m
Side slope width : Ws1 = 0.65 m
wetted Area, A1 = 2.66 m2
wetted perineter, P1 = 4.96 m
R1 = 0.54 m
drain cpacity, Q = 8.28 m3/s > required discharge,
velocity, V = 3.11 m/s < 4.0 m/s
2 yeasr storm top water lever, TWL2 = 0.84 m
5 yeasr storm top water lever, TWL5 = 1.00 m
100 years storm top water lever, TWL100 = 1.28 m
thus provide PC Block drain section with minimum
wall height = 1.5m
JURUTERA PERUNDING TEGAP SDN. BHD.
Designed :
Date :
Checked :
CALCULATION OUTPUT
drainage reserve
PC Block Drain
W
d
0.6
D
Sw1
1
0.3m FB
Ws1
PROJECT : 00109 / Meseba YauTY
page Main Drain Capacity Ogos 02
of main drain A2REF.
Pudu Cut Drain
drainage reserve = 5.0 m area,Ap = 0.16 m
alow freeboard = 0.3 m perimeter, Pp = 1.17 m
drain gradient , S =1/ 300
n = 0.015 stone pitching
Bottom section drain
Side wall slope: 1/sw1= 0.5
drain depth, D1 = 1.20 m
drain width, W = 1.65 m
Side slope width : Ws1 = 0.60 m
wetted Area, A1 = 3.87 m2
wetted perineter, P1 = 5.34 m
R1 = 0.72 m
drain cpacity, Q = 12.01 m3/s > required discharge, drain section is
velocity, V = 3.10 m/s sufficient
2 yeasr storm top water lever, TWL2 = 0.39 m
5 yeasr storm top water lever, TWL5 = 0.58 m
100 years storm top water lever, TWL100 = 0.94 m
thus provide Pudu cut drain section with minimum
wall height = 1.5m
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : 00109 / Meseba YauTY
CALCULATION OUTPUT
Designed :
Date :
Checked :
Designed :
drainage reserve
pudu cut section W
d
1.05
D
Sw1
1
0.3m FB
Ws1
page Main Drain Capacity Ogos 02
of main drain B1& B3REF.
Pudu Cut Drain
drainage reserve = 5.0 m area,Ap = 0.16 m
alow freeboard = 0.3 m perimeter, Pp = 1.17 m
drain gradient , S =1/ 500
n = 0.015 stone pitching
Bottom section drain
Side wall slope: 1/sw1= 0.5
drain depth, D1 = 1.70 m
drain width, W = 2.25 m
Side slope width : Ws1 = 0.85 m
wetted Area, A1 = 6.44 m2
wetted perineter, P1 = 7.06 m
R1 = 0.91 m
drain cpacity, Q = 18.06 m3/s > required discharge, drain section is
velocity, V = 2.80 m/s sufficient
2 yeasr storm top water lever, TWL2 = 0.53 m
5 yeasr storm top water lever, TWL5 = 0.70 m
100 years storm top water lever, TWL100 = 1.06 m
thus provide Pudu cut drain section with minimum
wall height = 2.0m
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : 00109 / Meseba YauTY
page Main Drain capacity Ogos 02
of main drain B2REF. CALCULATION OUTPUT
Designed :
Date :
Checked :
Date :
Checked :
CALCULATION OUTPUT
drainage reserve
pudu cut section W
d
1.05
D
Sw1
1
0.3m FB
Ws1
drainage reserve
pudu cut section W
d
1.05
D
Sw1
1
0.3m FB
Ws1
Main Drain B2 - Computation of Section Capacity
drainage reserve = 3.0 m 0.6 m PC Block Drain
alow freeboard = 0.3 m area,Ap = 0.2541 m
perimeter, Pp = 1.45 m
drain gradient , S =1/ 200
Bottom section n = 0.015 stone pitching
Side wall slope: 1/sw1= 0.50 drain
drain depth, D1 = 0.40 m
drain width, W = 1.2 m
Side slope width : Ws1 = 0.20 m
wetted Area, A1 = 0.81 m2
wetted perineter, P1 = 2.94 m
R1 = 0.28 m
drain cpacity, Q = 1.63 m3/s > required discharge,
velocity, V = 2.00 m/s < 4.0 m/s
2 yeasr storm top water lever, TWL2 = 0.53 m
5 yeasr storm top water lever, TWL5 = 0.71 m
100 years storm top water lever, TWL100 = 1.00 m
drainage reserve
PC Block Drain
W
d
0.6
D
Sw1
1
0.3m FB
Ws1
\\vboxsrv\conversion_tmp\scratch_3\[236585396.xls.ms_office.xls]box
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : Lot 1149 YauTY
page Catchment Flow Compuation Apr-06
of pre-development discharge computaion - Catchment A
REF.
1.0 Upstream Catchment Area
Upstream Catchment Area from catchment A = 14 ha
14 ha
1.1 Determine of time of concentration, tc
for density grassed surface (n=0.060)
average surface slopes =5%
Design overland flow distance = 200m
chart 14.1 to = 29 mins
average velocity in open drain , assumed v = 1 m/s
natural channel, Ld = 500 m
drain flow time, td = Ld / (v x 60) = 8 mins
thus, time of concentration, tc = to+ td = 37 mins
1.2 Determine rainfall intensity and Runoff Coefficient
Referred to Table of Average Rainfall Intensity (mm/hr) for short rainfall
duration for tc = 37 mins
thus,
rainfall intensity for 5 years storm5I 37 = 104.052 mm/hr
rainfall intensity for 10 years storm10I 37 = 115.178 mm/hr
rainfall intensity for 100 years storm100I 37 = 152.015 mm/hr
design chart Runoff Coefficient for Upstream catchment, C 5 = 0.35
14.4 between F C 10 = 0.42
between medium soil to sandy soil - forest C 100 = 0.51
1.3 Discharge flow computaion, Qpost , for pre-development
Q = (A1 x C1) x I
Discharge flow for 5 years storm Q 5,pre = 1.42 m
3/s
Discharge flow for 10 years storm Q 10,pre = 1.88 m
3/s
Discharge flow for 100 years storm Q 100,pre = 3.01 m
3/s
Designed :
Date :
Checked :
CALCULATION OUTPUT
\\vboxsrv\conversion_tmp\scratch_3\[236585396.xls.ms_office.xls]box
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : Lot 1149 YauTY
page Catchment Flow Compuation Apr-06
of post-development discharge computaion - Catchment A
REF.
1.0 Meseba Development site Post Development Catchment Area
Upstream Catchment Area Forest = 28ac. 11.8 ha
Project Site ( developed area ) = 10 ac. 5.53 ha
1.1 Upstream Discharge, upQ
Discharge flow for 5 years storm Q 5,up = 1.19 m
3/s
Discharge flow for 10 years storm Q 10,up = 1.59 m
3/s
Discharge flow for 100 years storm Q 100,up = 2.54 m
3/s
1.1 Determine of time of concentration, tc
for paved surface (n=0.015)
average surface slopes =1%
Design overland flow distance = 200m
chart 14.1 to = 10 mins
average velocity in open drain , assumed v = 1 m/s
drain length, Ld = 200 m
drain flow time, td = Ld / (v x 60) = 3 mins
thus, time of concentration, tc = to+ td = 13 mins
1.2 Determine rainfall intensity and Runoff Coefficient
Referred to Table of Average Rainfall Intensity (mm/hr) for short rainfall
duration for tc = 15 mins
thus,
rainfall intensity for 5 years storm5I 13 = 195.10 mm/hr
rainfall intensity for 10 years storm10I 13 = 215.20 mm/hr
rainfall intensity for 100 years storm100I 13 = 287.20 mm/hr
design chart Runoff Coefficient for Upstream catchment, C 5 = 0.88
14.4 3 Semi-detached house on bare earth C 10 = 0.88
C 100 = 0.88
1.3 Discharge flow computaion, Qpre , for Post-development
Q = (A1 x C1) x I + upQ
Discharge flow for 5 years storm Q 5,post = 3.83 m
3/s
Discharge flow for 10 years storm Q 10,post = 4.49 m
3/s
Discharge flow for 100 years storm Q 100,post = 6.42 m
3/s
CALCULATION OUTPUT
Designed :
Date :
Checked :
\\vboxsrv\conversion_tmp\scratch_3\[236585396.xls.ms_office.xls]box
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : Lot 1149 YauTY
page Catchment Flow Compuation Apr-06
of pre-development discharge computaion
REF.
1.0 Upstream Catchment Area
Upstream Catchment Area from catchment B = 22.1 ha
22.1 ha
1.1 Determine of time of concentration, tc
for density grassed surface (n=0.060)
average surface slopes =5%
Design overland flow distance = 200m
chart 14.1 to = 29 mins
average velocity in open drain , assumed v = 1 m/s
natural channel, Ld = 600 m
drain flow time, td = Ld / (v x 60) = 10 mins
thus, time of concentration, tc = to+ td = 39 mins
1.2 Determine rainfall intensity and Runoff Coefficient
Referred to Table of Average Rainfall Intensity (mm/hr) for short rainfall
duration for tc = 37 mins
thus,
rainfall intensity for 5 years storm5I 37 = 104.052 mm/hr
rainfall intensity for 10 years storm10I 37 = 115.178 mm/hr
rainfall intensity for 100 years storm100I 37 = 152.015 mm/hr
design chart Runoff Coefficient for Upstream catchment, C 5 = 0.35
14.4 between F C 10 = 0.42
between medium soil to sandy soil - forest C 100 = 0.51
1.3 Discharge flow computaion, Qpost , for pre-development
Q = (A1 x C1) x I
Discharge flow for 5 years storm Q 5,pre = 2.24 m
3/s
Discharge flow for 10 years storm Q 10,pre = 2.97 m
3/s
Discharge flow for 100 years storm Q 100,pre = 4.76 m
3/s
Designed :
Date :
Checked :
CALCULATION OUTPUT
\\vboxsrv\conversion_tmp\scratch_3\[236585396.xls.ms_office.xls]box
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : Lot 1149 YauTY
page Catchment Flow Compuation Apr-06
of post-development discharge computaion - Catchment B
REF.
1.0 Meseba Development site Post Development Catchment Area
Upstream Catchment Area Forest = 28ac. 17.21 ha
Project Site ( developed area ) = 10 ac. 3.65 ha
1.1 Upstream Discharge, upQ
Discharge flow for 5 years storm Q 5,up = 1.74 m
3/s
Discharge flow for 10 years storm Q 10,up = 2.31 m
3/s
Discharge flow for 100 years storm Q 100,up = 3.71 m
3/s
1.1 Determine of time of concentration, tc
for paved surface (n=0.015)
average surface slopes =1%
Design overland flow distance = 200m
chart 14.1 to = 10 mins
average velocity in open drain , assumed v = 1 m/s
drain length, Ld = 200 m
drain flow time, td = Ld / (v x 60) = 3 mins
thus, time of concentration, tc = to+ td = 13 mins
1.2 Determine rainfall intensity and Runoff Coefficient
Referred to Table of Average Rainfall Intensity (mm/hr) for short rainfall
duration for tc = 15 mins
thus,
rainfall intensity for 5 years storm5I 13 = 195.10 mm/hr
rainfall intensity for 10 years storm10I 13 = 215.20 mm/hr
rainfall intensity for 100 years storm100I 13 = 287.20 mm/hr
design chart Runoff Coefficient for Upstream catchment, C 5 = 0.88
14.4 3 Semi-detached house on bare earth C 10 = 0.88
C 100 = 0.88
1.3 Discharge flow computaion, Qpre , for Post-development
Q = (A1 x C1) x I + upQ
Discharge flow for 5 years storm Q 5,post = 3.48 m
3/s
Discharge flow for 10 years storm Q 10,post = 4.23 m
3/s
Discharge flow for 100 years storm Q 100,post = 6.27 m
3/s
CALCULATION OUTPUT
Designed :
Date :
Checked :
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : 00109 / Meseba YauTY
page Main Drain Catchment Computation Ogos 02
of main drain A1 REF.
1.0 Meseba Development site
Upstream Catchment Area i) Forest Reserve= 20 acre = 8 ha
(undevelope area)
Meseba ( forest ) I) Meseba = 5.0 acre 2 ha
( developed area ) ii) meseba = 31 acre = 12.6 ha
1.1 Upstream Discharge, upQ
Discharge flow for 2 years storm upQ 2 = 0.81 m
3/s
Discharge flow for 5 years storm upQ 5 = 1.07 m
3/s
Discharge flow for 100 years storm upQ 100 = 1.72 m
3/s
1.1 Determine of time of concentration, tc
for paved surface (n=0.015)
average surface slopes =1%
Design overland flow distance = 200m
chart 14.1 to = 10 mins
average velocity in open drain , assumed v = 1 m/s
drain length, Ld = 450 m
drain flow time, td = Ld / (v x 60) = 8 mins
thus, time of concentration, tc = to+ td = 18 mins
1.2 Determine rainfall intensity and Runoff Coefficient
Referred to Table of Average Rainfall Intensity (mm/hr) for short rainfall
duration for tc = 18 mins
thus,
rainfall intensity for 2 years storm2I 18 = 134.40 mm/hr
rainfall intensity for 5 years storm5I 18 = 162.70 mm/hr
rainfall intensity for 100 years storm100I 18 = 238.70 mm/hr
design chart Runoff Coefficient for proposed site catchment, C 2 = 0.79
14.3 (4) Urban Residential Fully Built Up with Gardens C 5 = 0.84
C 100 = 0.86
JURUTERA PERUNDING TEGAP SDN. BHD.
Designed :
Date :
Checked :
CALCULATION OUTPUT
PROJECT : 00109 / Meseba YauTY
page Main Drain Catchment Computation Ogos 02
of main drain A2 REF.
design chart Runoff Coefficient for proposed site catchment, C 2 = 0.6
14.4 (E) Close Crop C 5 = 0.63
C 100 = 0.66
Average Runoff coefficient for subcatchment , C2,avg = 0.76
C5,avg = 0.81
C100,avg = 0.83
1.3 Discharge flow computaion, Qpost, for Post-development
Q = (A1 x Cavg) x I + upQ
Discharge flow for 2 years storm Q 2,post = 4.16 m
3/s
Discharge flow for 5 years storm Q 5,post = 5.35 m
3/s
Discharge flow for 100 years storm Q 100,post = 8.06 m
3/s
1.4 Main drain A2 catchcment
Discharge From Main Drain A1 Q 2,post = 4.16 m
3/s
Q 5,post = 5.35 m3/s
Q 100,post = 8.06 m3/s
catchment from Main drain A2, ii) meseba = 5 acre = 2.02 ha
( developed area )
1.3 Discharge flow computaion, Qpost , for Post-development
Q = (A1 x C ) x I + upQ
Discharge flow for 2 years storm Q 2,post = 0.60 m
3/s
Discharge flow for 5 years storm Q 5,post = 0.77 m
3/s
Discharge flow for 100 years storm Q 100,post = 1.15 m
3/s
Total Discharge flow for 2 years storm Q 2,post = 4.76 m
3/s
Discharge flow for 5 years storm Q 5,post = 6.12 m
3/s
Discharge flow for 100 years storm Q 100,post = 9.21 m
3/s
OUTPUT
Designed :
Date :
Checked :
CALCULATION
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : 00109 / Meseba YauTY
page Main Drain Catchment Computation Ogos 02
of main drain B1 & B3REF.
1.0 Meseba Development site
Upstream Catchment Area i) Sri-seltra = 23 acre = 9.3 ha
(undevelope area)
Meseba ( developed area ) I) Meseba =27 acre 10.93 ha
1.1 Upstream Discharge, upQ
Discharge flow for 2 years storm upQ 2 = 0.94 m
3/s
Discharge flow for 5 years storm upQ 5 = 1.25 m
3/s
Discharge flow for 100 years storm upQ 100 = 2.00 m
3/s
1.1 Determine of time of concentration, tc
for paved surface (n=0.015)
average surface slopes =1%
Design overland flow distance = 200m
chart 14.1 to = 10 mins
average velocity in open drain , assumed v = 1 m/s
drain length, Ld = 200 m
drain flow time, td = Ld / (v x 60) = 3 mins
thus, time of concentration, tc = to+ td = 13 mins
1.2 Determine rainfall intensity and Runoff Coefficient
Referred to Table of Average Rainfall Intensity (mm/hr) for short rainfall
duration for tc = 13 mins
thus,
rainfall intensity for 2 years storm2I 13 = 158.50 mm/hr
rainfall intensity for 5 years storm5I 13 = 195.10 mm/hr
rainfall intensity for 100 years storm100I 13 = 287.20 mm/hr
design chart Runoff Coefficient for proposed site catchment, C 2 = 0.82
14.3 (4) Urban Residential Fully Built Up with Gardens C 5 = 0.85
C 100 = 0.86
1.3 Discharge flow computaion, Qpost, for Post-development
Q = (A1 x Cavg) x I + upQ
Discharge flow for 2 years storm Q 2,post = 4.89 m
3/s
Discharge flow for 5 years storm Q 5,post = 6.28 m
3/s
Discharge flow for 100 years storm Q 100,post = 9.50 m
3/s
Designed :
Checked :
CALCULATION
Date :
OUTPUT
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : 00109 / Meseba YauTY
page Main Drain Catchment Computation Ogos 02
of main drain B2REF.
1.0 Meseba Development site
Upstream Catchment Area i) Sri-seltra = 10 acre = 4.05 ha
(undevelope area)
Meseba ( developed area ) I) Meseba =3 acre 1.2 ha
1.1 Upstream Discharge, upQ
Discharge flow for 2 years storm upQ 2 = 0.41 m
3/s
Discharge flow for 5 years storm upQ 5 = 0.54 m
3/s
Discharge flow for 100 years storm upQ 100 = 0.87 m
3/s
1.1 Determine of time of concentration, tc
for paved surface (n=0.015)
average surface slopes =1%
Design overland flow distance = 200m
chart 14.1 to = 10 mins
average velocity in open drain , assumed v = 1 m/s
drain length, Ld = 100 m
drain flow time, td = Ld / (v x 60) = 2 mins
thus, time of concentration, tc = to+ td = 12 mins
1.2 Determine rainfall intensity and Runoff Coefficient
Referred to Table of Average Rainfall Intensity (mm/hr) for short rainfall
duration for tc = 12 mins
thus,
rainfall intensity for 2 years storm2I 12 = 164.40 mm/hr
rainfall intensity for 5 years storm5I 12 = 203.30 mm/hr
rainfall intensity for 100 years storm100I 12 = 299.60 mm/hr
design chart Runoff Coefficient for proposed site catchment, C 2 = 0.82
14.3 (4) Urban Residential Fully Built Up with Gardens C 5 = 0.85
C 100 = 0.86
1.3 Discharge flow computaion, Qpost, for Post-development
Q = (A1 x Cavg) x I + upQ
Discharge flow for 2 years storm Q 2,post = 0.86 m
3/s
Discharge flow for 5 years storm Q 5,post = 1.12 m
3/s
Discharge flow for 100 years storm Q 100,post = 1.73 m
3/s
OUTPUT
Designed :
Date :
Checked :
CALCULATION
U-drain
Side wall : 1/sw = 0
depth, D = 1.2 m without FB
width, W = 0.6 m
Side width : Ws = 0 m
Area, A = 0.72 m2
perineter, P = 3 m
R = 0.24 m
drain gradient , S =1/ 200
n = 0.015
discharge, Q = 1.310792 m3/s > required. OK.
velocity, V = 1.484237 m/s < 3.0 m/s. OK WITH PUDU CUT DRAIN
top water lever TWL = 1.8 m 100 year storm A= 0.163142
top water lever TWL = 0.96 m 5 year storm P= 1.174
TOTAL
A= 0.883142
P= 3.124
R= 0.282696
D
W
WITH PUDU CUT DRAIN
HR-drain
Side wall : 1/sw = 0
depth, D = 0.75 m without FB
width, W = 1 m
Side width : Ws = 0 m
Area, A = 1.032743 m2 0.75
perimeter, P = 2.842478 m
R = 0.363325 m
drain gradient , S =1/ 200
n = 0.015
discharge, Q = 2.478847 m3/s > required. OK.
velocity, V = 2.400254 m/s < 3.0 m/s. OK WITH H/R DRAIN
H/R drain dia. = 0.6
top water lever TWL = 1.8 m 100 year storm A= 0.282743
top water lever TWL = 0.96 m 5 year storm P= 0.942478
D
W
m
\\vboxsrv\conversion_tmp\scratch_3\[236585396.xls.ms_office.xls]box
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : Lot 1149 YauTY
page Catchment Flow Compuation
of post-development discharge computaion - Catchment A
REF.
Box culvert Capacity computation
depth, D = 1.50 m without FB
width, W = 2.10 m
Area, A = 3.15 m2
perimeter, P = 5.10 m
R = 0.62 m
drain gradient , S =1/ 500
n = 0.015
discharge, Q = 6.81 m3/s > required. OK.
velocity, V = 2.16 m/s < 4.0 m/s. OK
top water lever TWL = 1.43 m 100 years storm Q100,post = 6.42 m3/s
top water lever TWL = 1.09 m 10 years storm Q10,post = 4.49 m3/s
top water lever TWL = 0.97 m 5 years storm Q5,post = 3.83 m3/s
Thus, Proposed 2.1 x 1.8 m PC Box Culvert
(include 0.3 free board)
OUTPUT
Designed :
Date :
Checked :
CALCULATION
Apr-06
W
D
0.3 FB
Box Culvert
TWL
\\vboxsrv\conversion_tmp\scratch_3\[236585396.xls.ms_office.xls]box
JURUTERA PERUNDING TEGAP SDN. BHD.
PROJECT : Lot 1149 YauTY
page Catchment Flow Compuation
of post-development discharge computaion - Catchment B
REF.
Box culvert Capacity computation
depth, D = 1.50 m without FB
width, W = 2.10 m
Area, A = 3.15 m2
perimeter, P = 5.10 m
R = 0.62 m
drain gradient , S =1/ 500
n = 0.015
discharge, Q = 6.81 m3/s > required. OK.
velocity, V = 2.16 m/s < 4.0 m/s. OK
top water lever TWL = 1.41 m 100 years storm Q100,post = 6.27 m3/s
top water lever TWL = 1.04 m 10 years storm Q10,post = 4.23 m3/s
top water lever TWL = 0.9 m 5 years storm Q5,post = 3.48 m3/s
Thus, Proposed 2.1 x 1.8 m PC Box Culvert
(include 0.3 free board)
Checked :
CALCULATION OUTPUT
Apr-06
Designed :
Date :
W
D
0.3 FB
Box Culvert
TWL
W
D
0.3 FB
Box Culvert
TWL
2.0 Main Drain A1 - Computation of Section Capacity
Pudu Cut Drain
drainage reserve = 20.0 m area,Ap = 0.16 m
alow freeboard = 0.3 m perimeter, Pp = 1.17 m
drain gradient , S =1/ 1500
n = 0.015 (for lined
Bottom section concrete drain)
Side wall slope: 1/sw1= 2.00
drain depth, D1 = 1.45 m
drain width, W = 5.5 m
Side slope width : Ws1 = 2.90 m
wetted Area, A1 = 12.36 m2
wetted perineter, P1 = 17.59 m
R1 = 0.70 m
Upper Section
Side wall slope: 1/sw1= 2.00
drain depth, D2 = 0 m
drain width, W2= 1.8 m
Side slope width : Ws2 = NIL m
total wetted Area, A = NIL m2
total wetted perineter, P = NIL m
R = NIL m
drain cpacity, Q = 16.82 m3/s > required discharge, drain section is
velocity, V = 1.36 m/s sufficient
5 yeasr storm top water lever, TWL5 = 1.16 m
100 years storm top water lever, TWL100 = 1.4 m
drainage reserve
pudu cut section W
d
1.05
D
Sw1
1
freeboard
Ws1
1
D1
W2 Ws2
D2 Sw2
drainage reserve
dD
freeboard
1 D2 Sw2
Pudu Cut Drain
drainage reserve = 20.0 m area,Ap = 0.16 m
alow freeboard = 0.3 m perimeter, Pp = 1.17 m
drain gradient , S =1/ 1500
n = 0.018 (for lined
Bottom section concrete drain)
Side wall slope: 1/sw1= 2
drain depth, D1 = 1.35 m
drain width, W = 8.0 m
Side slope width : Ws1 = 2.70 m
wetted Area, A1 = 14.61 m2
wetted perineter, P1 = 19.25 m
R1 = 0.76 m
Upper Section
Side wall slope: 1/sw1= 2
drain depth, D2 = 0.10294394 m
drain width, W2= 1.5 m
Side slope width : Ws2 = 0.21 m
total wetted Area, A = 16.31 m2
total wetted perineter, P = 22.71 m
R = 0.72 m
drain cpacity, Q = 18.77 m3/s > required discharge, drain section is
velocity, V = 1.15 m/s sufficient
5 yeasr storm top water lever, TWL5 = 1.17 m
100 years storm top water lever, TWL100 = 1.61 m
2.0 Main Drain F - Computation of Section Capacity
Pudu cut drain
drainage reserve = 6.0 m area,Ap = 0.16 m
pudu cut section W
1.05
D
Sw1
1
Ws1
D1
W2 Ws2
Sw2
Ws
pudu cut section
W
ddrainage reserve
1.05
D
Sw
1
freeboard
alow freeboard = 0.3 m perimeter, Pp = 1.17 m
Side wall slope: 1/sw= 0.17 drain gradient , S =1/ 500
drain depth, D = 1.341 m n = 0.02 (for rubble wall)
drain width, W = 3.5 m
Side slope width : Ws = 0.22 m
total wetted Area, A = 5.15 m2
wetted perineter, P = 6.45 m
R = 0.80 m
drain cpacity, Q = 9.92 m3/s > required discharge, drain section is
velocity, V = 1.93 m/s sufficient
5 years storm top water lever, TWL5 = 1.12 m
100 years storm top water lever, TWL100 = 1.57 m