Control Flow Roof Drain Calculation

Now that we have all the variables filled into our drainage table we are ready to calculate our runoff q.

Control flow roof drain calculation.

The flow of each notch in the control flow weir is 10 gallons per minute per one inch of head. 1 00 x 1 5 x 500 96 23 7 79 gallons per minute. Calculate total roof area. For multiple walls use 50 percent of the maximum projected area of all walls.

Z105 control flo roof drain. 300 x 500 150 000 sq. 50 000 4 400 11 36. The sizing of roof drains must be large enough to quickly carry away all water entering the roof drains.

Calculate the runoff q. Step by step sizing of zurn drains step 1. 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.

Read the full list of features and benefits. Smith raintrol metered flow rate roof drains are designed to provide this control. 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. 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.

Take the roof s total square footage and divide by the total square footage handled by one drain. The zurn z105 15 diameter control flo roof drain for dead level roof construction has a dura coated cast iron body. Factors which affect proper roof drainage are deck slope drain size and placement of drains. Or 12 drains required.

Roof area is 300 x 500 ft. To do this we simply multiply across each row. Sizing quantity and location of raintrol roof drains are separate and distinct procedures from those for regular roof drains. The result is the number of drains needed.

The runoff q for the roof area in drainage zone a is. 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 control flo weir is linear functioning with integral membrane flashing clamp gravel guard and poly dome.