To obtain a fairly representative impact
of drought upon the flow of Oklahoma rivers and streams, the
U.S. Geological
Survey's Oklahoma District and OWRB have selected a network
of six existing stream gages across the state (all a part of
the network previously established and maintained by the two
agencies). Daily discharges are compared with average discharges
over the current period of record, corresponding with the beginning
of the water year, October 1. The streams are included in the
network because they are generally unregulated by upstream reservoirs
in Oklahoma and thus more accurately reflect streamflow and
runoff conditions.
Hydrographs
are generated by the USGS on a monthly basis and weekly during
times of drought.
rules 
