2 total area of roof.
How to size roof storm drains.
Rate of rainfall would.
Ipc provides four steps to size the roof drains on a building.
The sizing of roof drains must be large enough to quickly carry away all water entering the roof drains.
1 rate of precipitation.
Each scupper is draining 2 500 sq ft of roof area.
And 4 area handled by each drain.
From table a101 2 a 12 inch wide weir with a.
The result is the number of drains needed.
Determine 100 year 1 hour rainfall rate used for location of building.
The rain storm the flow of rainwater on the roof surface the ability of the roof drain to move the water from the roof to the piping the vertical piping the horizontal piping and the connection to the point.
Can be applied to the table in figure 8 to determine the sizes of the various components of the conventional roof drainage system including roof drains vertical leaders and horizontal drainage piping.
Size vertical storm drainage piping.
The sizing of the roof drainage system must consider all components.
In a roof drainage system you have many components.
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Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3 070 sq.
4 select a reference of a roof drain size with hourly rainfall together with the roof area square footage you have estimated and then determine from the chart below how many roof drains you require.
Select number of roof drains and calculate the roof area sloped to each drain.
To convert this roof area to an area for use with table a101 2 do this.
3 size of leader required.
The four things you will need to know are.
Sizing data for conventional drainage storm drainage sizing precipitation rate inches hour based on 15 minute precipitation zurn makes it easy to size roof drains.
Using figure 8 the 312 g p m.
Calculate drains needed.
System sizing data rainfall when expressed in g p m.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
Take the roof s total square footage and divide by the total square footage handled by one drain.
That is what is wrong.
Enter table a101 2 to find a length and head that will carry 4 500 sq ft or more.
1 4 in ft slope building storm drain 2 500 4 x 7 2 9 375 sq ft 4 500 sq ft.
Size horizontal storm drainage piping.
