Browser-based rainfall frequency analysis — fit and rank 11 distributions with confidence intervals.
Hydrology & Catchment AnalysisActiveFlood Frequency AnalysisIDF Curves
7 tools · Topic
Flood Frequency Analysis Software
Fitting distributions to annual maxima — Log-Pearson III under Bulletin 17C, GEV elsewhere — is core design hydrology. Indexed here: USGS PeakFQ, R and Python packages for extreme-value statistics, and tools that handle the awkward parts (low outliers, historic floods, regional skew) correctly.
HEC-SSP
Free
Statistical hydrology from HEC: Bulletin 17C flood frequency, volume-duration and general frequency analysis.
Hydrology & Catchment AnalysisActiveFlood Frequency Analysis
PeakFQ
Gov-Public
USGS software for Bulletin 17C flood-frequency analysis of annual peak-flow records.
Hydrology & Catchment AnalysisStableFlood Frequency AnalysisStreamflow Data
RainyDay
Open Source
Stochastic storm transposition in Python — probabilistic extreme rainfall scenarios from remote-sensing data.
Hydrology & Catchment AnalysisActiveDesign StormsFlood Frequency Analysis
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
USGS StreamStats
Gov-Public
USGS web tool for basin delineation and regression-based flow statistics at any US stream point.
Geospatial & Hydro-GISActiveWatershed DelineationFlood Frequency Analysis
fasstr
Open Source
Canadian government R package for streamflow analysis — trends, frequencies and summaries from HYDAT.
Data, Monitoring & ForecastingActiveStreamflow DataR Hydrology