Rain Water Storage & Pipe Gutter Calculation

5/13/2018 Rain Water Storage & Pipe Gutter Calculation

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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 :




CASE II


Q (m3/h) = 102

Q (m3/s) = 0.03

Drain pipe run out = 2 NosPipe dia Selection = 200 mm






PIPE FULL



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 :




CASE III


Q (m3/h) = 204

Q (m3/s) = 0.06

Drain pipe run out = 2 NosPipe dia Selection = 200 mm






PIPE FULL



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 :




CASE IV

Rain Water Catchment Area 4080m2


Q (m3/h) = 204

Q (m3/s) = 0.06

Drain pipe run out = 4Nos ( number of gutter pipe)Pipe dia Selection = 200 mm






PIPE FULL




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CONT.No.:

DATE :

BY :

CHECKED :

DATE :




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


10/17

31-Jan-12

Herawan

1

%


11/17

31-Jan-12

Herawan

1

%


12/17

31-Jan-12

Herawan

1

%


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31-Jan-12

Herawan

1

%


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31-Jan-12

Herawan

1

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

Rain Water Storage & Pipe Gutter Calculation

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