From table a101 2 a 12 inch wide weir with a.
How to size roof storm drains.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
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.
The sizing of the roof drainage system must consider all components.
Each scupper is draining 2 500 sq ft of roof area.
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Enter table a101 2 to find a length and head that will carry 4 500 sq ft or more.
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.
3 size of leader required.
In a roof drainage system you have many components.
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.
The four things you will need to know are.
To convert this roof area to an area for use with table a101 2 do this.
Rate of rainfall would.
Determine 100 year 1 hour rainfall rate used for location of building.
2 total area of roof.
Size horizontal 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.
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.
Select number of roof drains and calculate the roof area sloped to each drain.
System sizing data rainfall when expressed in g p m.
The above sizing data is offered as a guide only.
That is what is wrong.
Size vertical storm drainage piping.
The pipe sizing is only one component.
1 rate of precipitation.
Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3 070 sq.
The result is the number of drains needed.
Ipc provides four steps to size the roof drains on a building.
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.
Calculate drains needed.
Using figure 8 the 312 g p m.
