The water & wastewater toolkit
Water engineering.
Calculated.
Free metric calculators for water supply, sewerage, stormwater and treatment.
Explore calculators
New to the library
Sizing tools
From minimum pipe diameter to treatment tank dimensions.
Pipe sizing
Find the minimum internal diameter for a flow and velocity limit.
Pump total head
Combine elevation, pressure, velocity and system losses.
Gravity sewer sizing
Size a circular sewer for design flow, grade and relative depth.
Treatment tank sizing
Estimate working volume and rectangular tank dimensions.
Hydraulics · Drainage · Treatment
Calculator library
About Gaddam
A toolkit for water infrastructure
Each calculator runs in your browser and shows its formula, assumptions and source. Example values let you try a tool before entering your own inputs.
Use the results for preliminary assessment. Verify the inputs, method and applicable standards before relying on a result for design or operations.