Delta Hydro Studio
FreemiumVerified
Browser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.
Urban Stormwater & InfrastructureActiveRational MethodCulvert Sizing
2 tools · Topic
Culvert Sizing & Design Tools
Culvert hydraulics — inlet versus outlet control, headwater limits, HDS-5 nomographs — is one of the most common tasks in drainage design. This page collects FHWA HY-8, open-source culvert solvers and scripted implementations of the HDS-5 procedure, so you can size crossings with tools that match your review authority’s expectations.
HY-8
Gov-PublicVerified
FHWA's free culvert analysis program — the reference implementation of HDS-5 culvert hydraulics.
Hydraulics & River SystemsActiveCulvert SizingOpen Channel Flow