PROJECT: PPIA Domestic Buidling
DATE:20 06 2016
REV.: 00
STORM DRAIN PIPE SIZING
1.Impermeable factor
Type of surface K
- Wetertight roof surfaces 0.70 to 0.95
- Apshalt pavement in good order 0.85 to 0.90
- Closely jointed wood and stone pavements 0.80 to 0.85
- Magadame roadways 0.25 to 0.45
- Black pavement with wids joints 0.50 to 0.70
- Lawns and gardens 0.05 to 0.25
- Wooded areas 0.01 to 0.2
Formula:
Q= V x A
Q= Area to be drained(m2) x Rainfall intensity (m/hr) x impermeable factor
60 (to bring to minutes) x 60 (bring to secinds)
A=πD^2/4
- Volume of flow :Q(m3/s)
- Velocity of flow: V (m/s)
- Area of pipe :A(m2)
Table Calculation
Description Volume o flow dia(m)
Surface(m2) 7200
Rainfall intencity(m/hr) 0.15
0.2550 0.6006
imermeable factor of surface 0.85
Velocity of flow (m/s) 0.9
Diameter(mm) Area(m2) No.Pipe
Pipe Calculated 600.59 283152.98 1.00
Pipe Selected 100 7850.00 36.07
References:
- Plumbing technology secon edition page163
- Mekong river commission flood management and mitigation program report (2013-2014)
Diameter of storm drain pipe
Requirement Volume o flow
Surface(m2) 2000
Rainfall intencity(m/hr) 0.12
imermeable factor of surface 0.7
Velocity of flow (m/s) 0.85
Table 8.2 of plumbing technology second edition (
Type of surface
Wetertight roof surfaces
Apshalt pavement in good order
Closely jointed wood and stone pavements
Magadame roadways
Black pavement with wids joints
Lawns and gardens
Wooded areas
18000 1500 1000 7200
600
300
of storm drain pipe
Volume o flow dia(m) dia(mm) 0.033
54867.01
0.0467 0.2644 264.38
500 300 150000
0.012962962962963
#DIV/0!
echnology second edition (BS Standard)
264.38 54867.01 0.0485377
of surface 1200 1130400
0.70 to 0.95
0.85 to 0.90
0.80 to 0.85
0.25 to 0.45
0.50 to 0.70
0.05 to 0.25
0.01 to 0.2
10
16
5
10
5
7
53
530
15000
1260 8300 2075 7.228916
m3/s
0.36578
PROJECT: OFFICE BUILDING
DATE: 19 01 2014
REV.: 00
STORM DRAIN PIPE SIZING
1.Impermeable factor
Type of surface K
- Wetertight roof surfaces 0.70 to 0.95
- Apshalt pavement in good order 0.85 to 0.90
- Closely jointed wood and stone pavements 0.80 to 0.85
- Magadame roadways 0.25 to 0.45
- Black pavement with wids joints 0.50 to 0.70
- Lawns and gardens 0.05 to 0.25
- Wooded areas 0.01 to 0.2
1.Block A
Requirement Volume of flow dia(m) dia(mm)
- Surface(m2) : 350
- Rainfall intencity(m/hr) : 0.15
0.01 0.12 121.87
- Imermeable factor of surface: 0.8
- Velocity of flow (m/s) : 1
Calculate Diameter : 122 mm
Diameter design : 100 mm x3set
2.Block B
Requirement Volume of flow dia(m) dia(mm)
- Surface(m2) : 128
- Rainfall intencity(m/hr) : 0.3
0.01 0.11 107.44
- Imermeable factor of surface: 0.85
- Velocity of flow (m/s) : 1
Calculate Diameter : 107 mm
Diameter design : 100 mm x 2set
3.Block C
Requirement Volume of flow dia(m) dia(mm)
- Surface(m2) : 190
- Rainfall intencity(m/hr) : 0.3
0.01 0.13 130.89
- Imermeable factor of surface: 0.85
- Velocity of flow (m/s) : 1
Calculate Diameter : 131 mm
Diameter design : 100 mm x 2set
4.Block D
Requirement Volume of flow dia(m) dia(mm)
- Surface(m2) : 80
- Rainfall intencity(m/hr) : 0.3
0.01 0.08 84.94
0.01 0.08 84.94
- Imermeable factor of surface: 0.85
- Velocity of flow (m/s) : 1
Calculate Diameter : 85 mm
Diameter design : 100 mm x 1set
References: Plumbing technology second edition (BS Standard)
MH:09 MH:10 MH:23
IL: -800 IL: -800 IL: -800
L 12300 L 11000 L 9000
sl 0.003 sl 0.003 sl 0.003
MH:08 -836.9 MH:11 -833 MH:24 -827
L 9500 L 9500 L 16000
sl 0.003 sl 0.003 sl 0.003
MH:01 -865.4 MH:12 -861.5 MH:25 -875
IL: -865.4 IL: -861.5 IL: -875
L 6800 L 11000 L 9000
sl 0.003 sl 0.003 sl 0.003
MH02 -885.8 MH13 -894.5 MH28 -902
L 4500 L 10000 L 8500
sl 0.003 sl 0.003 sl 0.003
MH03 -899.3 MH14 -924.5 MH29 -927.5
L 12000 L 12000
sl 0.003 sl 0.003 MH:26
4MH0 -935.3 4MH15 -960.5 IL: -800
L 8000 L 6500
sl 0.003 sl 0.003 MH:27
4MH05 -959.3 4MH16 -980 IL: -800
L 12000 L 6500
sl 0.003 sl 0.003
4MH06 -995.3 4MH17 -999.5
L 11000 L 6000
sl 0.003 sl 0.003
4MH07 -1028.3 4MH18 -1017.5
L 6000
sl 0.003
4MH19 -1035.5
MH:31
IL: -800
L 9000
sl 0.003
MH:32 -827
L 8000
sl 0.003
MH:33 -851
IL: -851
L 11000
sl 0.003
MH34 -884
L 15000
sl 0.003
MH35 -929
L 974
sl 0.003
MH35 -931.922
