How To Size Roof Leader Collection Pipe Size

Calculate total roof area.

How to size roof leader collection pipe size.

Step by step sizing of zurn drains. Size vertical storm drainage piping. Table 1106 2 storm drain pipe sizing for si. 75x50 solution 15 square inches and from table vi it is found that a 4 1 2 inch pipe has an area slightly greater than 15 inches.

And 4 area handled by each drain. The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout. When sizing roof drains the limiting factor for the amount of water each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required. 300 x 500 150 000 sq.

Determine 100 year 1 hour rainfall rate used for location of building. Roof area is 300 x 500 ft. 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. 1 inch 25 4 mm 1 foot 304 8 mm 1 gallon per minute 3 785 l m.

When sizing roof drains the limiting factor for the amount of water each drain will carry away is the size of leader therefore increasing leader size decreases the number of drains required. 2 total area of roof. 3 size of leader required. Select number of roof drains and calculate the roof area sloped to each drain.

Four steps to sizing roof drains. 1 rate of precipitation. Size horizontal storm drainage piping.