How to Calculate Gutter Rain Water Supplies

Rain water is water that falls from the clouds on the surface soil. The water flowed into certain channels. Rain falling on homes or residential complex is channeled through gutters-diameter vertical gutters are usually 3 "(minimum) are forwarded to the channels horizontal with a slope of 0.5 to 1% with the shortest distance to get to the open channel environment.


In calculating large rain water drain pipe must be known that rainwater roof is in the area of m2.

As standard discharge pipe sizes are as follows:

1. Diameter 3 ", volume 255 liters / min
2. Diameter 4 ", volume 547 liters / min
3. Diameter 5 ", volume 990 liters / min
4. Diameter 6 ", volume 1610 liters / min
5. Diameter 8 ", volume 3470 liters / min 

 Rainfall in Indonesia average of 5-8 liters / minute

As the following example we present a case as follows:
Egg a building has a roof area of 1,000 m2. How the amount of pipe and the amount of rain water pipes needed on the roof of the building?

Answer:

• Roof area = 1,000 m2.
• The average rain - we take the average in Indonesia between = 5-8 liters / minute.
• Precipitation = 1,000 m2 x 5-8 liters / minute = 5000-8000 liters / minute. (taken 8000 liters / min)
• Gutter used a diameter of 6 "(volume 1610 liters / min)
• If precipitation = 8,000 liters / minute, the rain water will flow down within 1 minute is = 8.000: 1.610 = 4.97 fruit

To speed up the necessary drainage pipes 6 "by 5 pieces scattered located so that water on the roof at a given time will be wasted out within 1 minute.

Thus it seems, may be useful and thank you.