What is the size of a horizontal rainwater pipe with a 2% slope for a maximum rainfall of 100 mm on a 206 m2 area?

To determine the appropriate size of a horizontal rainwater pipe for a specific area and rainfall rate, several factors must be considered, including the area that the rainwater is collected from, the intensity of the rainfall, and the slope of the pipe.

In this case, the area is 206 square meters with a maximum rainfall of 100 mm. First, it’s essential to calculate the total volume of water that will potentially flow through the pipe during the maximum rainfall event. The volume can be calculated using the formula:

Volume (m³) = Area (m²) × Rainfall (m)

So, converting the rainfall from millimeters to meters, 100 mm becomes 0.1 m. Now, applying the values:

Volume = 206 m² × 0.1 m = 20.6 m³

Next, considering that the pipe must adequately handle this volume of rainwater, the size of the pipe must correspond to the flow rate that can be supported based on its diameter and the slope. A 2% slope for a horizontal pipe encourages adequate drainage, ensuring that water moves efficiently through the pipe.

For a standard rainwater drainage system, the diameter of the pipe is crucial for determining how efficiently it can carry this