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v1.1.14

Drainage Calculations

Seven gravity-drainage calculators plus a manhole schedule, all in one project.

Pinned to

BS EN 12056-2:2000BS EN 12056-3:2000IPC 2024UPC 2021BS EN 1825-1:2004BS EN 1825-2:2002PDI G101-2017BRE Digest 365:2016BS 6297:2007+A1:2008CIRIA C753:2015Approved Document H 2015BS EN 16933-2:2017BS EN 124:1994EPA 625/R-00/008 (2002)BS EN 60034-1:2010BS EN 60034-30:2009IEC 60034-30-1:2014NEMA MG-1 2009

Last reviewed against the printed text · 6 September 2026

Drainage Calculations — sanitary inputs
Drainage Calculations — sanitary inputs
Drainage Calculations — results
Drainage Calculations — results
  • Sanitary — stacks, branches and drains with velocity checks.
  • Stormwater — roof and site runoff on real rainfall intensity.
  • Roof gutters — gutters, outlets and rainwater pipes, with a preliminary siphonic screen.
  • Soakaway / SuDS — infiltration sizing on measured percolation.
  • Septic percolation — drainage-field sizing.
  • Grease interceptor — four codes computed side by side.
  • Sump pit — volume, pump duty and short-cycling check on motor start limits.

Walkthrough

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