Free engineering tools
Water & wastewater
calculators
A single place to run everyday hydraulic, drainage and treatment calculations, with the working shown alongside the results.
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About Gaddam
A toolkit for water infrastructure
Use the library to check calculations across water supply, sewerage, stormwater and treatment. Each calculator runs in your browser and includes its method, assumptions and a reference.
Use the results for preliminary assessment. Verify the inputs, method and applicable standards before relying on a result for design or operations.