An Integrated Stream Classification System for Texas
by Eric S. Hersh, M.S.E. and David R. Maidment, Ph.D.
ABSTRACT
The recently-passed Senate Bill 3 tasks stakeholders and regulators with determining and
reviewing environmental flow needs. A stream classification system was developed and tested
for Texas to support analyses of environmental flows based on quantitative data for 18
distinguishing parameters encompassing watershed and stream channel processes from four
disciplines: (1) Hydrology & Hydraulics, (2) Water Quality, (3) Geomorphology & Physical
Processes, and (4) Climatology. The State of Texas was partitioned into five regions: East
Texas, South-Central Texas, Lower Rio Grande Basin, West Texas, and North-Central Texas by
8-digit Hydrologic Unit Code (HUC) basins.
This stream classification system might be used to: (1) discern likely similarities and
differences between rivers and streams of the State, (2) remotely characterize stream segments
for which resources are insufficient for detailed field studies, (3) recognize streams and
watersheds of the State as having common identities, (4) allow conclusions drawn from an
instream flow study from a particular river reach to have a wider applicability than the particular
study site, and (5) assist in prioritization of rivers and reaches for future instream flow studies.
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