Control Flow Roof Drain Calculation

Sizing quantity and location of raintrol roof drains are separate and distinct procedures from those for regular roof drains. For multiple walls use 50 percent of the maximum projected area of all walls. For single roof drains for single vertical walls affecting the collection area of a roof drain add 50 percent of the side area to the total for calculating the flow rate.

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The zurn z105 15 diameter control flo roof drain for dead level roof construction has a dura coated cast iron body.

Control flow roof drain calculation.

To do this we simply multiply across each row. To compute the depth of water in inches at the drain obtain the total flow for any fixed set of conditions and locale from the roof drain selector and divide by 10. Calculate the runoff q. For single curved vertical walls use 50 percent of the maximum projected area.

As contrasted to conventional drains which attempt to drain off storm water as quickly as it falls on the roof s surface control flo drains the roof at a controlled rate. 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. Zurn manufactures the control flo roof drain for dead level roof construction. Step by step sizing of zurn drains step 1.

The flow of each notch in the control flow weir is 10 gallons per minute per one inch of head. Read the full list of features and benefits. Factors which affect proper roof drainage are deck slope drain size and placement of drains. Roof area is 300 x 500 ft.

Z105 control flo roof drain. 300 x 500 150 000 sq. Take the roof s total square footage and divide by the total square footage handled by one drain. 50 000 4 400 11 36.

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. The runoff q for the roof area in drainage zone a is. All roof openings whether they are at the roof drain or at the vent stack should be protected from vandalism. Now that we have all the variables filled into our drainage table we are ready to calculate our runoff q.

Calculate total roof area. The result is the number of drains needed. 1 00 x 1 5 x 500 96 23 7 79 gallons per minute. The control flo weir is linear functioning with integral membrane flashing clamp gravel guard and poly dome.

Or 12 drains required. What is control flo zurn defines control flow as an advanced method of removing rain water off dead level or sloped roofs. The sizing of roof drains must be large enough to quickly carry away all water entering the roof drains. Smith raintrol metered flow rate roof drains are designed to provide this control.