Selection calculator
gravity systems

The Wavin gravity systems selection calculator enables the easy and quick determination of the required number of roof drains for the gravitational drainage of a roof and the selection of the diameters for the drainage installation using HDPE, AS+, and SiTech systems. The selection can be performed automatically or manually.

In the automatic selection, besides choosing parameters such as the rainfall model or runoff coefficient, the user only needs to specify the type of pipe material and the total roof area to be drained. The calculator will determine the minimum required number of roof drains and select the diameters for the drainage installation.

In the manual selection, in addition to choosing parameters such as the rainfall model, type of pipe material, and pipe slope, the user needs to specify the area allocated to each roof drain, determine the runoff coefficient (which can vary for each area/drain), and input all segments of the installation and drains, mirroring the layout according to the project or assumptions.

Gravity systems selection calculator
Training material: Webinar

Instructional video: Instruction