Delta Hydro Studio
FreemiumVerified
Browser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.
Urban Stormwater & InfrastructureActiveRational MethodCulvert Sizing
4 tools · Topic
Open Channel Flow Calculators & Solvers
Normal depth, critical depth, gradually varied flow profiles and channel design — the bread and butter of hydraulic engineering. The tools here range from quick Manning's equation calculators to full step-method profile solvers, in every delivery form from Excel to Python.
FHWA Hydraulic Toolbox
Gov-Public
A free bundle of FHWA drainage calculators: channels, weirs, curb & gutter, riprap, detention and more.
Hydraulics & River SystemsStableOpen Channel FlowRational Method
HEC-RAS
FreeVerified
The world's most used hydraulic model: free 1D/2D river analysis, sediment, water quality and flood mapping.
Hydraulics & River SystemsActiveRiver Modelling2D Hydraulic Modelling
HY-8
Gov-PublicVerified
FHWA's free culvert analysis program — the reference implementation of HDS-5 culvert hydraulics.
Hydraulics & River SystemsActiveCulvert SizingOpen Channel Flow