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home > reports > crwr online report 2007-02

 

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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