Hydro-Climatic Data Network (HCDN) -- A USGS Streamflow Data Set for the U.S. for the Study of Climate Fluctuations
A streamflow data set, which is specifically suitable for the study of
surface-water conditions throughout the United States under fluctuations
in the prevailing climatic conditions, has been developed.  This data set,
called the Hydro-Climatic Data Network, or HCDN, consists of streamflow
records for 1,659 sites …