An order of magnitude.
Not the project itself.
Derives an approximate rainwater flow rate from roof area and rainfall intensity.
Typical indicative values. The exact rainfall intensity is determined per project from local meteorological data.
The hydraulic calculation is delivered within 5 business days based on your roof plan and local rainfall report — a certified PDF and the Geberit ProPlanner output are included.
Start a ProjectFlow rate comes from roof area multiplied by rainfall intensity. That intensity varies by region, and the calculator uses the data for the province you select.
In a siphonic system the pipe runs full-bore, meaning a degree of filling of ψ = 1.0. A gravity pipe runs only partially full, so the same diameter carries far less. This is where siphonic drainage gets its half-the-diameter, twice-the-capacity claim.
The general standard for rainwater drainage in Türkiye is TS EN 12056-3. This preliminary calculation follows the same logic; at project stage the calculation is carried out with Geberit ProPlanner.
Share your roof plan and let our engineer produce the ProPlanner report.
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