Streamflow gain/loss in the Republican River Basin, Nebraska, July 1975

This arc and point data set contains streamflow-measurement sites and
reaches indicating streamflow gain or loss under base-flow conditions along
Republican River tributaries in Dundy and Chase Counties, Nebraska during
July 14 to 18, 1975 (U.S. Geological Survey, 1976). The streamflow measurements
were made to obtain data on ground-water/surface-water interaction. Flow
was observed visually to be zero, was measured, or was estimated at
55 sites. Tributaries were followed upstream until the first road
crossing where zero flow was encountered. For selected streams, points
of zero flow upstream of the first zero flow site also were checked.

Streamflow gain or loss for each stream reach was calculated by
subtracting the streamflow values measured at the upstream end of
the reach and values for contributing tributaries from the
downstream value. The data obtained reflected base-flow conditions
suitable for estimating streamflow gains and losses for
stream reaches between sites.

This digital data set was created by manually splitting the lines
from a 1:250,000 hydrography data set (Soenksen and others, 1999) at
every streamflow-measurement site. Each set of stream segments between
measurement sites was assigned a unique reach number.