Is it the flow of the rain that lasts for 10min and occurs once every 5 years the current resort
For areas of less than 10,000 m 2, the rainfall intensity can be set to 0.013 l/s m 2 for the entire country.
Surface coefficient is a value that shows how much a surface permits water.
|Type of surface
|Grass surface untreated land.
|Surface with dense coating such as roof, asphalt or concrete.
Horizontally projected area
The projected area corresponds to the area that is visible straight from the top.
Likely rainwater flow
The calculated total amount of water delivered in from the calculated area.