Hubbard Brook Experimental Forest (US Forest Service): Daily Streamflow by Watershed, 1956 - present

Streamflow at 9 watersheds within the Hubbard Brook
Experimental Forest has been measured continuously from as early as
1955. Streams are gaged with V-notch weirs at the outlet of each
watershed. Height of water behind the weir increases with increased
streamflow and is recorded by means of a float attached mechanically
to a pen on a spring-wound strip-chart recorder. Gage height is
converted to streamflow rate by calibration factors and then
integrated to generate daily streamflow. Streamflow rate is measured
as volume per unit time(L/s) and is proportional to the watershed
area.