Are you using professional drainage design software ?
If you are still using spreadsheets to size your pipework you really need to up your game.
We use Causeway Flow for our drainage designs.
Causeway Flow drainage design and modelling software is built on the Modified Rational method for sizing conveyance systems and the state-of-the-art 1D SWMM engine for hydraulically analysing storm, SuDS or a combination of traditional and sustainable drainage systems.

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