USGS Water Services · Schema
Peaks
Annual peak flow values are the maximum instantaneous streamflow values recorded at a particular site for the entire water year from October 1 to September 30. Note that the annual peak flow value may not occur at the same time the maximum water level occurs due to conditions such as backwater, tidal fluctuations, etc.
WaterStreamflowGroundwaterWater QualityHydrologyEnvironmentalUSGSNWISGovernmentOpen DataOGC