How To Size Roof Leader Collection Pipe Size

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.

How to size roof leader collection pipe size.

Four steps to sizing roof drains. 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. Calculate total roof area. Step by step sizing of zurn drains step 1.

The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout. 300 x 500 150 000 sq. 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. Size vertical storm drainage piping.

3 size of leader required. Determine 100 year 1 hour rainfall rate used for location of building. 2 total area of roof. Roof area is 300 x 500 ft.

What size of leader will be required to drain a roof 75 feet long by 50 feet wide. 1106 3 vertical leader sizing vertical leaders shall be sized based on the flow rate from horizontal gutters or the maximum flow rate through roof drains. And 4 area handled by each drain. 1 inch 25 4 mm 1 foot 304 8 mm 1 gallon per minute 3 785 l m.

Table 1106 2 storm drain pipe sizing for si. Select number of roof drains and calculate the roof area sloped to each drain. Size horizontal storm drainage piping.