Development of a GIS Development of a GIS Coverage of Impaired Coverage of Impaired

Streams in TexasStreams in Texas

Presented byPresented bySamantha HonSamantha Hon

CE 394KCE 394KNov. 19, 2002Nov. 19, 2002

OverviewOverview

IntroductionIntroduction PurposePurpose MethodMethod Progress to-dateProgress to-date Future WorkFuture Work

IntroductionIntroduction

Clean Water Act, amended 1987Clean Water Act, amended 1987– Water bodies must be Water bodies must be “fishable and swimmable”“fishable and swimmable”

Impaired water bodies – EPA Impaired water bodies – EPA Section 303(d) Section 303(d) ListList (299 water bodies for 2002 Draft list) (299 water bodies for 2002 Draft list)

IntroductionIntroduction

Impaired water bodies – Impaired water bodies – TMDLsTMDLs (Total Maximum Daily Load)(Total Maximum Daily Load)

Implement TMDLs – Best Implement TMDLs – Best Management PracticesManagement Practices

PurposePurpose

Project for Project for TxDOTTxDOT TxDOTTxDOT

– Potential dischargerPotential discharger– Stormwater Stormwater runoffrunoff from highways from highways

and roadsand roads Develop Develop GIS coverageGIS coverage of impaired of impaired

streams using ArcGISstreams using ArcGIS– Determine where Determine where present or future present or future

infrastructureinfrastructure can contribute to can contribute to impairmentimpairment

MethodMethod

BasemapBasemap of watersheds (HUCs) in of watersheds (HUCs) in TexasTexas– Overlay with coverage of streams and Overlay with coverage of streams and

rivers, lakes, and highways and roadsrivers, lakes, and highways and roads

303(d) list data in Excel format303(d) list data in Excel format– Convert to Convert to .dbf file.dbf file to import into to import into

ArcGISArcGIS

MethodMethod

JoinJoin 303(d) list table with the streams and 303(d) list table with the streams and lakes coverages in the basemaplakes coverages in the basemap

QueryQuery by pollutant in ArcMap by pollutant in ArcMap– Find out Find out what streamswhat streams impaired by impaired by what type of what type of

constituentconstituent– Determine which Determine which road/highwayroad/highway crosses impaired crosses impaired

streamstreamID SEG_ID HUC Watershed Waterbody PATHOGENS TOTAL DS MERCURY

TX-0101-A-2002 0101A 11090106 Middle Canadian-Spring DIXON CREEK 1

TX-0102-2002 0102 11090106 Middle Canadian-Spring LAKE MEREDITH 1

TX-0105-2002 0105 11090103 Rita Blanca RITA BLANCA LAKE 1 1

TX-0199-A-2002 0199A 11100104 Palo Duro PALO DURO RESERVOIR

TX-0201-A-2002 0201A 11140106 Pecan-Waterhole MUD CREEK 1

TX-0202-D-2002 0202D 11140101 Bois D'arc-Island PINE CREEK 1

TX-0203-A-2002 0203A 11130210 Lake Texoma BIG MINERAL CREEK 1

TX-0207-A-2002 0207A 11120105 Lower Prairie Dog Town Fork Red BUCK CREEK 1

TX-0211-2002 0211 11130209 Little Wichita LITTLE WICHITA RIVER 1

TX-0214-A-2002 0214A 11130206 Wichita BEAVER CREEK

ProgressProgress

Basemap of Texas with Basemap of Texas with HUCs,HUCs, and and streamsstreams and and lakeslakes from TCEQ from TCEQ

ProgressProgress

ProblemProblem– Not all streamsNot all streams listed in 303(d) list listed in 303(d) list

available in the TNRCC streams and available in the TNRCC streams and lakes coveragelakes coverage

– Need to find more complete Need to find more complete coverage of streamscoverage of streams

ProgressProgress

ProgressProgress

ProgressProgress

ProblemProblem

– No common field No common field – Need to manually add a field, Need to manually add a field,

Seg_ID, to the new, complete stream Seg_ID, to the new, complete stream coveragecoverage

ProgressProgress

Example of output – Query by Example of output – Query by PathogensPathogens

ProgressProgress

Future WorkFuture Work

Input new field into attribute table Input new field into attribute table for the complete stream coveragefor the complete stream coverage

Use new, more complete stream Use new, more complete stream coverage and append to 303(d) list coverage and append to 303(d) list tabletable

Overlay map of highways and Overlay map of highways and roadsroads