The Cumulative-Streamflow Hydrograph is a graphical presentation of recent cumulative daily streamflow (discharge) observed at an individual USGS streamgage (the black line), plotted over the long-term statistics of streamflow for each day of the year at that station. The statistics, based on quality assured and approved data, include the maximum annual cumulative discharge recorded during the period of record (top of the light blue area); the mean-daily cumulative flow for each day (middle of the green area); the minimum cumulative discharge during recorded for each day (bottom of brown area).