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Pipe Size and Run of Calculation Table Based On 100 Years Return Period & 125 MM/HR Rainfall Intensity

The document summarizes the sizing of roof drains and vertical pipes according to IPC 2012 standards based on rainfall intensity data from Doha airport. It then calculates stormwater runoff from the roof using an equation that considers the roof area, runoff coefficient, rainfall intensity from IDF curves, and conversion factors. A table is presented showing runoff calculations for different roof areas based on a 100 year return period and 125 mm/hr rainfall intensity.

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vignesh ms
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451 views1 page

Pipe Size and Run of Calculation Table Based On 100 Years Return Period & 125 MM/HR Rainfall Intensity

The document summarizes the sizing of roof drains and vertical pipes according to IPC 2012 standards based on rainfall intensity data from Doha airport. It then calculates stormwater runoff from the roof using an equation that considers the roof area, runoff coefficient, rainfall intensity from IDF curves, and conversion factors. A table is presented showing runoff calculations for different roof areas based on a 100 year return period and 125 mm/hr rainfall intensity.

Uploaded by

vignesh ms
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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1. The roof drain and vertical pipe sizing is accordance with IPC 2012, table 1106.

2 (Refer ANNEXURE-4)
2. Rain fall intensity referencence NDIA Storm Water Report Figure 3 -IDF Curve for the Doha International Airport (Refer ANNEXURE-4)

3. The runoff calculation for roof is in accordance with ASPE handbook using the formula below:

Q= CIA/(1000/3600)

Where :

Q = Runoff in m3/s A= Total Roof Area ,m2

C= Runoff co efficient =0.95 for roof 1000 = Conversion factor , mm to merers

I= Rainfall Intensity , mm/hr From IDF Curve 3600= Conversion factor , hours to Seconds

PIPE SIZE AND RUN OF CALCULATION TABLE BASED ON 100 YEARS RETURN PERIOD & 125 MM/HR RAINFALL INTENSITY
Vertical Pipe & Projected Area Capacites (IPC, Table 1106.2)
(A) Roof Projected Numbers of
LOCATION (I) Rainfall intensity, mm/hr Duration , minutes Total Flow (Q) -Roof Drain(m3/s)
Area,m2 roof Drain Run Of Co-efficients
from IDF curve from IDF curve
INNER PITCH LANDSCAPE 15900 1 75 5 0.35 0.1159

INNER SCHOOL TERRACE 4005 1 75 5 0.8 0.0668

LEVEL-1 TERRACE 7320 1 75 5 0.8 0.1220

LEVEL-2 TERRACE 940 1 75 5 0.8 0.0157

TOTAL FLOW 0.3204 m3/s


TOTAL AREA 28165

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