Enter table a101 2 to find a length and head that will carry 4 500 sq ft or more.
How to size roof storm drains.
Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3 070 sq.
The pipe sizing is only one component.
Calculate drains needed.
The full flow capacity of a drain is not realized until the water reaches approximately 2 5 above the inlet in a four inch drain and 3 5 in a six inch drain.
Select number of roof drains and calculate the roof area sloped to each drain.
Using figure 8 the 312 g p m.
Each scupper is draining 2 500 sq ft of roof area.
1 rate of precipitation.
2 total area of roof.
From table a101 2 a 12 inch wide weir with a.
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Size horizontal storm drainage piping.
That is what is wrong.
The above sizing data is offered as a guide only.
The four things you will need to know are.
Determine 100 year 1 hour rainfall rate used for location of building.
3 size of leader required.
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.
To convert this roof area to an area for use with table a101 2 do this.
And 4 area handled by each drain.
Rate of rainfall would.
The sizing of the roof drainage system must consider all components.
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.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
Ipc provides four steps to size the roof drains on a building.
Size vertical storm drainage piping.
1 4 in ft slope building storm drain 2 500 4 x 7 2 9 375 sq ft 4 500 sq ft.
In a roof drainage system you have many components.
The result is the number of drains needed.
Take the roof s total square footage and divide by the total square footage handled by one drain.
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.
