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Currently, the Network Design functionality supports Manning's equation and Colebrook-White for velocity calculations.
We would like to request support for Kutter's equation as an additional hydraulic formula within Network Design.
Kutter's equation is still referenced in some design standards, legacy sewer networks, and historical hydraulic studies. When reproducing or validating existing designs, it is often necessary to use the same hydraulic formulation that was originally applied.
Thank you for the suggestion and thanks to those who voted.
I am moving the status of this idea to 'Gathering Support' and in the meantime we will engage in consultations with a wider array of stakeholders to gauge their interest and gather additional perspectives on the proposed feature.
Should we observe a substantial level of enthusiasm and demand, we will be inclined to advance the status of this suggestion to "Under Consideration." This stage will involve a more detailed analysis, including a feasibility study, resource allocation assessment, and preliminary planning to understand how this feature could be seamlessly integrated into the software.
Why this is important or needed - Kutter's coefficient depends on hydraulic radius and slope. Because of that, no single Manning's n reproduces Kutter results across all pipe sizes, gradients and flow depths. The equivalent Manning's n is
. It equals the Kutter n only at R = 1 m and can be 5–25% higher for small, flat pipes. Native support would let users reproduce legacy designs exactly instead of calculating a separate equivalent n for every pipe at a single depth.