Delta Hydro Studio
FreemiumVerified
Browser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.
Urban Stormwater & InfrastructureActiveRational MethodCulvert Sizing
20 tools · Category
Urban Stormwater & Infrastructure
Urban drainage is its own discipline: pipe networks, inlets, detention basins, green infrastructure and the regulatory calculations that go with them. This category gathers EPA SWMM and its many wrappers, sewer and pond design utilities, SuDS/LID sizing tools and the spreadsheets municipalities actually review. If your day involves a drainage report, a stormwater management plan, or sizing a culvert under a driveway, start here.
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
EPA SWMM
Gov-PublicVerified
The public-domain engine of urban drainage: dynamic-wave pipe networks, runoff, LID and water quality.
Urban Stormwater & InfrastructureActiveSWMMSewer Modelling
Generate SWMM inp (QGIS plugin)
Open Source
Build and read EPA SWMM models as QGIS layers — free GIS-based SWMM model construction.
Urban Stormwater & InfrastructureActiveSWMMQGIS Hydrology
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
MUSIC
Commercial
eWater's stormwater-quality model — the WSUD assessment standard across Australian councils.
Urban Stormwater & InfrastructureActiveSuDS & LID DesignWater Quality Modelling
MatSWMM
Open Source
MATLAB (and Python/LabVIEW) co-simulation with SWMM — built for real-time control research.
Urban Stormwater & InfrastructureDormantSWMMSewer Modelling
NetSTORM
Free
CDM Smith's free rainfall statistics and STORM-method screening model — IDF analysis, disaggregation, CSO planning.
Urban Stormwater & InfrastructureActiveIDF CurvesRainfall Data
OpenFlows SewerGEMS
Commercial
Bentley's sanitary and combined sewer modelling suite, integrated with CAD and GIS environments.
Urban Stormwater & InfrastructureActiveSewer ModellingStormwater Design
PCSWMM
Commercial
CHI's commercial GIS front-end for SWMM — the most direct productivity upgrade for serious SWMM users.
Urban Stormwater & InfrastructureActiveSWMMSewer Modelling
PySWMM
Open SourceVerified
Python interface to the SWMM engine — step through simulations, read state, and control gates in real time.
Urban Stormwater & InfrastructureActiveSWMMPython Hydrology
Virginia DEQ's official Excel workbooks for stormwater compliance via the Runoff Reduction Method.
Urban Stormwater & InfrastructureActiveSuDS & LID DesignStormwater Design
Free web tool for building synthetic design-storm patterns — 560+ temporal patterns, exportable to SWMM and HMS.
Urban Stormwater & InfrastructureActiveDesign StormsIDF Curves
pystorms
Open Source
Benchmark scenarios for smart-stormwater control — test real-time control algorithms on curated SWMM systems.
Urban Stormwater & InfrastructureStableSWMMPython Hydrology
swmm_api
Open Source
Pure-Python reading, editing and running of SWMM INP, RPT and OUT files — the full file-format toolkit.
Urban Stormwater & InfrastructureActiveSWMMPython Hydrology
swmmio
Open Source
Pandas-powered reading, editing and version-diffing of SWMM models — the model-management side of the stack.
Urban Stormwater & InfrastructureActiveSWMMPython Hydrology
swmmr
Open Source
Run and read EPA SWMM from R — model execution, results import and GIS conversion on CRAN.
Urban Stormwater & InfrastructureDormantSWMMR Hydrology
swmmtoolbox
Open Source
Python CLI and library for extracting time series from SWMM binary output files.
Urban Stormwater & InfrastructureStableSWMMPython Hydrology