ࡱ> egd%` bjbj"x"x .&@@nnnnnnnJ J J J $n j ( >  jjjjjjj$|khm5jn 5jnn JjRn n jjnn 1HqJ !Ri`j0jnsnnnTX :)   5j5j j&$&nnnnnn  Innovations to Support Instream Flow Determinations in Texas, USA II: Stream Classification System Presenter: Wendy Gordon, Texas Commission on Environmental Quality Abstract An integrated stream classification system was developed and tested for Texas based on quantitative data for 18 distinguishing parameters encompassing watershed and stream channel processes and functions 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) basin. Person Completing this Form Wendy Gordon, Ph.D., Texas Parks and Wildlife Department Todays Date 04/17/2008 Project Date and Duration 9/1/2006 to 8/31/2007 Project Collaborators Eric Hersh and David Maidment, Ph.D., Center for Research in Water Resources, The University of Texas at Austin Project Location Texas, USA Study Area (km2) 695621 Aim/Purpose 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. Objectives Use Geographic Information System (GIS) technology to organize existing information relevant to the understanding of Texas streams and rivers (i.e., water quality, geologic and geomorphic, hydrologic and hydraulic, and biological data) and to develop a classification scheme such that particular classes or regions of streams and rivers could be recognized as having a common identity. Specific Activities and Methods Used an existing, qualitative scheme of Texas rivers and streams presented in the National Research Councils review of the Texas Instream Flow Program as the basis of the project. Incorporated existing GIS-based data such as the National Hydrography Dataset and other data layers. Used eight-digit HUCs as the base layer for classification. Quantitative information such as climatology, soil type, water quality monitoring data were added to refine the qualitative classification scheme and produce a more quantitative scheme. Data Used See report at  HYPERLINK "http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdf" http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdf Data Generated Classification scheme, data interpreted to the HUC level, and geodatabases Results/Outcomes A more quantitatively-based classification scheme than we started with that can be further refined with the addition of biological data in particular. Products Geodatabases and maps Management and Policy Application Texas is too large a state to conduct detailed instream flow studies for all rivers and streams. Thus, developing classification schemes is one way to generalize or leverage the information we do have about instream flow needs across stream types or classes. This project was one of two undertaken to aid in that generalization process. Ideally, relationships between aquatic biota and hydrology and other physical parameters would be developed in order to fully operationalize the classification schemes for instream-flow protection. Monitoring NA Funding $75,000 USD Funding Source US EPA Clean Water Act Section 106 pass through dollars to agency Documents Hersh, Eric S. and Maidment, David R., 2007, An integrated stream classification system for Texas, Center for Research in Water Resources Online Report 07-02, 130 p.,  HYPERLINK "http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdf" http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdf =BCDIefg   ' ( 3 ? @ C L N b c x y ﻶzvznnjb^hR0hR0hP 5hDhR0h_T5hRhR0hD5h6hR0B* phhAhS hS5hR0hR05 h,5hhoE hoEhoE hX5h<}h<}5h6h66 h66 hR05>*h6hoE5>* h65>* h 5>*h6h65>* h_T5>*$CDfg  3 c   ]$^`a$gdg:$^`a$gdA$^`a$gdr$^`a$gd6 p^gd6$a$gdr         ! ) : ; \]ghkm'et  .#$!%&0Ĺ˩˕ h[5 h dThP hhhR0h_T5h&oh' hoEhP hoE hoEhoEhR0hR05hD hShSh4hR0hP 5H*hShR0hR0hP 5hP :045Ay{|}"# ŧzrnjf^Zh_ThhP 5h8-hr'ht wh[h8-5h[h 5h[h_T5 hphP h6hl h6hh6h[5 hh[ hp5 h[5h[hP 5 h~\65hh'hphR0hR05h*Yhg:0Jjhg:U hg:hg:jhg:Uhg:"$8$a$gdr$&dP^`a$gdr$^`a$gdr$a$gdg: "#$+,78FG:;Gؾеh*Yh0JjqhU hg:hjhUh hRhP hR5hhhP 5hP h_ThR,1h/ =!"#$% qDyK 9http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdfyK http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdfyX;H,]ą'cqDyK 9http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdfyK http://www.crwr.utexas.edu/reports/pdf/2007/rpt07-02.pdfyX;H,]ą'c@@@ NormalCJ_HaJmH sH tH DA@D Default Paragraph FontRi@R  Table Normal4 l4a (k@(No List 6U@6 ? 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