EPA SWMM
Gov-PublicVerified
The public-domain engine of urban drainage: dynamic-wave pipe networks, runoff, LID and water quality.
Urban Stormwater & InfrastructureActiveSWMMSewer Modelling
Delta Hydro Studio
DHS VerifiedActiveBrowser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.
by Delta Hydro
- Pricing
- Freemium
- License
- Proprietary
- Commercial use
- Permitted
- Ecosystem
- Browser
- Platform
- Web
About Delta Hydro Studio
Delta Hydro Studio is a web-native toolkit of design calculators for water engineers: rational-method peak flows, time of concentration, culvert checks, open-channel hydraulics, pipe and pump sizing and detention routing — each built as a guided, unit-aware calculation that produces output you can drop into a design report.
Everything runs in the browser: nothing to install, nothing to licence per seat, and calculations are shareable with colleagues and reviewers as living documents rather than screenshots. Built by Delta Hydro, the team behind this directory — which is why it carries the verified badge; treat that as the disclosure it is.
Where it fits in the workflow
TerrainCatchmentRainfallRunoffRoutingHydraulicsMappingReporting
Alternatives to Delta Hydro Studio
Other urban stormwater & infrastructure tools covering similar workflow stages.
PySWMM
Open SourceVerified
Python interface to the SWMM engine — step through simulations, read state, and control gates in real time.
Urban Stormwater & InfrastructureActiveSWMMPython Hydrology
EPA National Stormwater Calculator
Gov-Public
EPA's free tool for estimating site runoff reduction from green infrastructure, with climate scenarios.
Urban Stormwater & InfrastructureStableSuDS & LID DesignStormwater Design
EPA SSOAP Toolbox
Gov-Public
EPA's toolbox for sanitary sewer overflow planning — RDII analysis with the SWMM engine underneath.
Urban Stormwater & InfrastructureDormantSewer ModellingSWMM
HydroCAD
Commercial
The US land-development standard for TR-55/TR-20 hydrographs and detention pond design.
Urban Stormwater & InfrastructureActiveDetention DesignTR-55
InfoWorks ICM
Commercial
Autodesk's integrated catchment model — the heavyweight for large sewer networks and coupled 2D flooding.
Urban Stormwater & InfrastructureActiveSewer Modelling2D Hydraulic Modelling