Control Flow Roof Drain Calculation

For single curved vertical walls use 50 percent of the maximum projected area. All roof openings whether they are at the roof drain or at the vent stack should be protected from vandalism. 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.

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Calculate total roof area.

Control flow roof drain calculation.

To do this we simply multiply across each row. 1 00 x 1 5 x 500 96 23 7 79 gallons per minute. Take the roof s total square footage and divide by the total square footage handled by one drain. Now that we have all the variables filled into our drainage table we are ready to calculate our runoff q.

Smith raintrol metered flow rate roof drains are designed to provide this control. Read the full list of features and benefits. Sizing quantity and location of raintrol roof drains are separate and distinct procedures from those for regular roof drains. 50 000 4 400 11 36.

Roof area is 300 x 500 ft. The flow of each notch in the control flow weir is 10 gallons per minute per one inch of head. The control flo weir is linear functioning with integral membrane flashing clamp gravel guard and poly dome. Z105 control flo roof drain.

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. 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. The result is the number of drains needed. Calculate the runoff q.

Zurn manufactures the control flo roof drain for dead level roof construction. Factors which affect proper roof drainage are deck slope drain size and placement of drains. Step by step sizing of zurn drains step 1. 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.

For multiple walls use 50 percent of the maximum projected area of all walls. 300 x 500 150 000 sq. The runoff q for the roof area in drainage zone a is. What is control flo zurn defines control flow as an advanced method of removing rain water off dead level or sloped roofs.

Or 12 drains required. 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. The zurn z105 15 diameter control flo roof drain for dead level roof construction has a dura coated cast iron body. The sizing of roof drains must be large enough to quickly carry away all water entering the roof drains.