https://water.usgs.gov/edu/measureflow.html USGS How streamflow is measured http://water.usgs.gov/edu/measureflow.html ► Find out how USGS measures streamflow How streamflow is measured http://water.usgs.gov/edu/measureflow.html staff gage, How streamflow is measured: USGS Water Science http://water.usgs.gov/edu/measureflow.html The USGS Water Science School https://water.usgs.gov/edu/measureflow.html USGS Streamflow Measurement staff gage,