CROPWAT
Free
FAO's classic tool for crop water requirements and irrigation scheduling from climate and crop data.
Hydrology & Catchment AnalysisDormantIrrigationEvapotranspiration
25 tools · Category
Hydrology & Catchment Analysis
Hydrology is where every water project starts: how much water arrives, when, and from where. This category collects rainfall-runoff models, catchment delineation utilities, flood-frequency and design-storm tools, and the scripting libraries engineers use to automate them. Whether you need a continuous simulation model for a research catchment or a quick SCS Curve Number estimate for a site plan, the tools below cover the full range — from heavyweight suites like HEC-HMS and SWAT to focused Python and R packages you can drop into an existing workflow.
Filters
Browser-based rainfall frequency analysis — fit and rank 11 distributions with confidence intervals.
Hydrology & Catchment AnalysisActiveFlood Frequency AnalysisIDF Curves
HEC-HMS
FreeVerified
The US Army Corps standard for rainfall-runoff modelling — event and continuous simulation, free to use.
Hydrology & Catchment AnalysisActiveHEC-HMSSCS Curve Number
HEC-ResSim
Free
Reservoir system simulation from HEC — operating rules, flood control and multi-reservoir networks, free.
Hydrology & Catchment AnalysisActiveReservoir OperationsFlood Routing
HEC-SSP
Free
Statistical hydrology from HEC: Bulletin 17C flood frequency, volume-duration and general frequency analysis.
Hydrology & Catchment AnalysisActiveFlood Frequency Analysis
HydroMT
Open Source
Deltares' Python framework that builds ready-to-run hydrological models from global and local datasets.
Hydrology & Catchment AnalysisActivePython HydrologyDEM Processing
MIKE SHE
Commercial
DHI's integrated hydrological model — coupled overland, unsaturated, groundwater and channel flow.
Hydrology & Catchment AnalysisActiveGroundwater ModellingEvapotranspiration
NeuralHydrology
Open Source
Deep-learning rainfall-runoff modelling — the LSTM framework behind much of ML hydrology research.
Hydrology & Catchment AnalysisActiveStreamflow ForecastingPython Hydrology
PRMS
Gov-Public
USGS Precipitation-Runoff Modeling System — distributed continuous simulation with strong snow physics.
Hydrology & Catchment AnalysisActiveSnow HydrologyPython Hydrology
PeakFQ
Gov-Public
USGS software for Bulletin 17C flood-frequency analysis of annual peak-flow records.
Hydrology & Catchment AnalysisStableFlood Frequency AnalysisStreamflow Data
Pywr
Open Source
Python water-resource network simulator — fast LP-based allocation for reservoir systems and supply networks.
Hydrology & Catchment AnalysisActiveReservoir OperationsPython Hydrology
RainyDay
Open Source
Stochastic storm transposition in Python — probabilistic extreme rainfall scenarios from remote-sensing data.
Hydrology & Catchment AnalysisActiveDesign StormsFlood Frequency Analysis
Raven
Open Source
A flexible hydrological modelling framework — emulate GR4J, HBV, HMETS or build your own model structure.
Hydrology & Catchment AnalysisActiveStreamflow ForecastingPython Hydrology
SPOTPY
Open Source
Python toolbox for calibrating and uncertainty-analysing any environmental model — SCE-UA, DREAM, GLUE and more.
Hydrology & Catchment AnalysisStablePython Hydrology
SWAT+
Open Source
The USDA watershed model for land use, sediment and nutrients — continuous simulation at catchment scale.
Hydrology & Catchment AnalysisActiveWater Quality ModellingSCS Curve Number
USGS Hydrologic Toolbox
Gov-Public
USGS's merged surface-water and groundwater statistics program — baseflow separation, flow duration, low flows.
Hydrology & Catchment AnalysisActiveStreamflow DataFlood Frequency Analysis
VIC
Open Source
The Variable Infiltration Capacity model — macroscale land-surface hydrology for big basins and climate studies.
Hydrology & Catchment AnalysisStableSnow HydrologyClimate Projections
WBNM
Free
The Watershed Bounded Network Model — free Australian runoff-routing hydrology for flood estimation.
Hydrology & Catchment AnalysisStableFlood RoutingDesign Storms
Wflow.jl
Open Source
Deltares' distributed hydrological model in Julia — gridded rainfall-runoff with kinematic-wave routing.
Hydrology & Catchment AnalysisActiveStreamflow ForecastingSnow Hydrology
WinTR-55
Gov-Public
NRCS's official implementation of TR-55 small-watershed hydrology: peaks, hydrographs and storage.
Hydrology & Catchment AnalysisStableTR-55SCS Curve Number
airGR
Open Source
INRAE's GR rainfall-runoff models (GR4J family) plus CemaNeige snow, packaged for R.
Hydrology & Catchment AnalysisActiveR HydrologySnow Hydrology
hms-commander
Open Source
Python automation for HEC-HMS — batch and parallel runs, design storms, and DSS handoff to HEC-RAS.
Hydrology & Catchment AnalysisActiveHEC-HMSPython Hydrology
hydroeval
Open Source
A tiny Python package that computes NSE, KGE and friends correctly — the metrics layer of model evaluation.
Hydrology & Catchment AnalysisStablePython Hydrology
pyet
Open Source
Reference and potential evapotranspiration in Python — 20+ published methods, FAO-56 included, on pandas/xarray.
Hydrology & Catchment AnalysisActiveEvapotranspirationIrrigation
pyromb
Open Source
Build RORB, WBNM and URBS model files straight from GIS shapefiles — with companion QGIS plugins.
Hydrology & Catchment AnalysisActiveFlood RoutingQGIS Hydrology