rain water storage & pipe gutter calculation
TRANSCRIPT
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DESIGN APPROVAL
REF. NO. DESIGN/M-01/II/2008
CONTRACTOR PT. KINDEN
PROJECT NAME DAIRI ZINC/LEAD PORT FACILITY PROJECT
CONTRACT NO
WORK ITEM MECHANICAL-PLUMBING
SPECIFICATION STORM WATER DRAINAGE SYSTEM
PRODUCT
NAME
BRAND
SPECIFICATION
ROOF AREA ( RAIN CATCHMENTS AREA )
60 M X 34 M ( 2040 m2)
RUN OFF GUTTER/PIPE NUMBER :
2 NOS OF PIPE PVC WITH DIA. 200 MM EACH
SLOPE/GRADE : 1 : 200
MANUFACTURER
COUNTRY OF ORIGIN
KIND OF SUBMISSION DESIGN CALCULATION
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KIND OF SUBMISSION DESIGN CALCULATION
SIGNATURE
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PIPE GRADE REGULATION
Pipe grade is dependant on the level of the pipe outlet to achieve drainage, the grade of the surface, avoiding obstacles and other pipes,
and cover requirements. For a first trial use the grade of the surface
If the surface is flat, the code requires the use of the minimum allowable grades as shown below :-
PIPE SIZE PIPE SIZE
90 1:100 1:90 225 1: 200 1: 350
100 1:100 1:120 300 1: 250 1: 350150 1:100 1: 200 375 1: 300 1: 350
Note, for Australia a 150 dia pipe requires a grade of 1:100, the same grade as required for a 100 and a 90 dia pipe.
I believe this to be a misprint and should be 1:150, as larger pipes generally require a flatter grade.
By the way, the purpose of a minimum grade is hopefully to ensure a self cleansing velocity during periods of low flow.
Also, the Code only refers to the "Nominal Diameter". The actual Internal diameter may be slightly more or less, depending on the material c
MIN GRADEAUST
MINGRADE NZ
MINGRADEAUST
MINGRADE NZ
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CONT.No.:
DATE :
BY :
CHECKED :
DATE :
FLOW IN PIPE - MANNING FORMULA SHEET No:
Project: Zinc/Lead Port & Facility Project
Subject: Storm Water Drain Pipe
Data :
Roof Area ( 60m x 34 m) = 2040M2
CASE I
Rainfall Intensity = 30 mm/h 0.03m/h
Q (m3/h) = 61.2
Q (m3/s) = 0.02
Drain pipe run out = 2 Nos
Pipe dia Selection = 200 mm
Flow required Q (d) = 0.008 m3/s
Coefficient of surface roughness n = 0.009
Slope of Pipe S = 1 Vertically 200 Horizontal. 0.5
Grade Selected = 1 : 200 ( See Grade regulation Australia Std )
Diameter of Pipe D (mm) = 200 0.20m
PIPE FULL
Manning Formula Q = 0.312/ n* (D)^8/3*S^1/2
Manning Formula V = 0.397/ n* (D)^2/3*S^1/2
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CONT.No.:
DATE :
BY :
CHECKED :
DATE :
FLOW IN PIPE - MANNING FORMULA SHEET No:
Project: Zinc/Lead Port & Facility Project
Subject: Storm Water Drain Pipe
CASE II
Rainfall Intensity = 50 mm/h 0.05m/h
Q (m3/h) = 102
Q (m3/s) = 0.03
Drain pipe run out = 2 NosPipe dia Selection = 200 mm
Flow required Q (d) = 0.014 m3/s
Coefficient of surface roughness n = 0.009
Slope of Pipe S = 1 Vertically 200 Horizontal. 0.5
Grade Selected = 1 : 200 ( See Grade regulation Australia Std )
Diameter of Pipe D (mm) = 200 0.20m
PIPE FULL
Manning Formula Q = 0.312/ n* (D)^8/3*S^1/2
Manning Formula V = 0.397/ n* (D)^2/3*S^1/2
Velocity V = 1.07 m/s (MIN 0.8 , MAX 3 M/S)
Discharge Q ( f ) = 0.0335 m3/s Qf>Qd
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CONT.No.:
DATE :
BY :
CHECKED :
DATE :
FLOW IN PIPE - MANNING FORMULA SHEET No:
Project: Zinc/Lead Port & Facility Project
Subject: Storm Water Drain Pipe
CASE III
Rainfall Intensity = 100 mm/h 0.10m/h
Q (m3/h) = 204
Q (m3/s) = 0.06
Drain pipe run out = 2 NosPipe dia Selection = 200 mm
Flow required Q (d) = 0.028 m3/s
Coefficient of surface roughness n = 0.009
Slope of Pipe S = 1 Vertically 200 Horizontal. 0.5
Grade Selected = 1 : 200 ( See Grade regulation Australia Std )
Diameter of Pipe D (mm) = 200 0.20m
PIPE FULL
Manning Formula Q = 0.312/ n* (D)^8/3*S^1/2
Manning Formula V = 0.397/ n* (D)^2/3*S^1/2
Velocity V = 1.07 m/s (MIN 0.8 , MAX 3 M/S)
Discharge Q ( f ) = 0.0335 m3/s Qf>Qd
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CONT.No.:
DATE :
BY :
CHECKED :
DATE :
FLOW IN PIPE - MANNING FORMULA SHEET No:
Project: Zinc/Lead Port & Facility Project
Subject: Storm Water Drain Pipe
CASE IV
Rain Water Catchment Area 4080m2
Rainfall Intensity = 50 mm/h 0.05m/h
Q (m3/h) = 204
Q (m3/s) = 0.06
Drain pipe run out = 4Nos ( number of gutter pipe)Pipe dia Selection = 200 mm
Flow required Q (d) = 0.014 m3/s
Coefficient of surface roughness n = 0.009
Slope of Pipe S = 1 Vertically 200 Horizontal. 0.5
Grade Selected = 1 : 200 ( See Grade regulation Australia Std )
Diameter of Pipe D (mm) = 200 0.20m
PIPE FULL
Manning Formula Q = 0.312/ n* (D)^8/3*S^1/2
Manning Formula V = 0.397/ n* (D)^2/3*S^1/2
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CONT.No.:
DATE :
BY :
CHECKED :
DATE :
FLOW IN PIPE - MANNING FORMULA SHEET No:
Project: Zinc/Lead Port & Facility Project
Subject: Storm Water Drain Pipe
STORM DRAIN PIPE/GUTTER PERFORMANCEPipe/Gutter flow ability > Rain Flow ( Qf/Qd > 100 %)
CONDITION Wetted Radius/depth pipe
( RAIN WATER INENSITY) Full 75% 50%
Case I 30 mm/h OK OK OK Case II 50 mm/h OK OK OK
Case III 100 mm/h OK OK x
Case IV 50 mm/h OK OK OK
Case I to III Base on assumption :Rain water catchment area is 2040 m2
Case IV base assumption rainwater catchement area 4080 m2 with 4 nos
with dia. 200 mm each
CONCLUSION
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31-Jan-12
Herawan
1
%
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Herawan
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31-Jan-12
Herawan
1
%
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31-Jan-12
Herawan
1
%
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31-Jan-12
Herawan
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rain pipe
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A. Volume of Rainfall for the Area of roof
(Precipitation)
CASE1 30mm/hour
Q=0.03m/h2,040m2=61m3/h
CASE2 50mm/hourQ=0.05m/h2,040m2=102m3/h
CASE3 100mm/hour
Q=0.10m/h2,040m2=204m3/h
B Gutter pipe flow ability (using D200 2pipes)
Water occupied area for pipe
CASE1 Pipe 50%
Q=(0.2^23.14/450%)1.07m/S3,600S2pipes=121m3/h
CASE2 Pipe 75%
Q=(0.2^23.14/475%)1.21m/S3,600S2pipes=205m3/h
CASE3 Pipe 100%
Precipitation per pour is generally 10~30mm/hour
It is rare rainfalling 100mm/hour
Q=(0.2^23.14/4100%)1.07m/S3,600S2pipes=242m3/hPrecipitation 100mm/h
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LAYOUT STORM WATER DRAINAGE SYSTEMNO SCALE
over flow200 mm dia
300 m3
Q1
Q
Q1 = Q2 + Q3= Q2 , Q3= 0, Full
store
Base on assumtion of Rainfall water 50 mm/hr (0.05m/hr)Debit of rain water within 4 running hours :400 m3
stored
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over flow200 mm dia
2= over Flow
3 = 0 in Full Stored