Roof Drain Leader Pipe

1 inch 25 4 mm 1 foot 304 8 mm 1 gallon per minute 3 785 l m.
Roof drain leader pipe. The flow rate in storm drain piping shall not exceed that specified in table 1106 2. In general increasing leader size will decrease the number of drains required. Sizing a roof water drain the first step in sizing a roof drain is to calculate the surface area of the roof that the drains will be covering as well as the average hourly rainfall rate at the building location. Table 1106 2 storm drain pipe sizing for si.
Downspouts are drainage pipes that direct rain water from the roof to the ground. Featuring durable plastic construction this extension can be buried bent or connected to additional sections. This flexible downspout extension easily bends and holds its shape and can be extended from 25 55 in. This is where the rainwater is lead away from the building s foundation so that no rainwater is able to pool around the building.
Divide roof area 1 by area per leader 4 to determine the number of drains required. Roof drain selection. Vertical and horizontal storm drain piping shall be sized based on the flow rate through the roof drain. Downspouts are usually vertical and usually extend down to ground level.
There is generally a bend of 70 degrees at the bottom. Approximate leader drain pipe size. Reference leader size with hourly rainfall rate to determine roof area drained by each leader chart b.