Hydrologic StudyHydrologic Studyof the Sandies & Elm of the Sandies & Elm

WatershedWatershed

Jessica L. WattsJessica L. Watts

Research Project BackgroundResearch Project Background

TCEQ TMDL Study– Bacteria– Low Dissolved Oxygen

Elm River

Sandies River

Semester Project OverviewSemester Project Overview

Tasks:Tasks:

Objective:Objective:To create an HSPF data model that To create an HSPF data model that simulates the gauging station flow for simulates the gauging station flow for the years 2000 through 2004.the years 2000 through 2004.

Arc Hydro Watershed DelineationArc Hydro Watershed DelineationArc Hydro To HSPFArc Hydro To HSPFHSPF Forcing DataHSPF Forcing Data

– Interpolation ComparisonInterpolation ComparisonHSPF Output CalibrationHSPF Output Calibration

Arc HydroArc HydroWatershed DelineationWatershed Delineation

Arc Hydro Input RequirementsArc Hydro Input RequirementsDigital Elevation ModelDigital Elevation Model– Seamless ( http://seamless.usgs.gov/ )Seamless ( http://seamless.usgs.gov/ )

United StatesUnited States– 1/3” National Elevation Dataset1/3” National Elevation Dataset

NHD FlowlinesNHD Flowlines– USGS – National Hydrography Dataset USGS – National Hydrography Dataset

( http://nhd.usgs.gov/data.html )( http://nhd.usgs.gov/data.html )High ResolutionHigh Resolution

Arc Hydro Subbasin DelineationArc Hydro Subbasin Delineation

Arc HydroArc HydroTerrain PreprocessingTerrain PreprocessingWatershed ProcessingWatershed Processing– 35 Subbasins35 Subbasins

(limited by HSPF)(limited by HSPF)

Arc Hydro to HSPFArc Hydro to HSPF

Arc Hydro to HSPFArc Hydro to HSPF

Tools and Models have been built to Tools and Models have been built to convert information from Arc Hydro into convert information from Arc Hydro into the HSPF format.the HSPF format.

Arc Hydro To HSPFModels and Tools

Created by Nate Johnson

Subbasin DelineationSubbasin DelineationFrom Arc HydroFrom Arc Hydro– SubwatershedSubwatershed

– With unique HydroID for each areaWith unique HydroID for each area

Drainage LinesDrainage LinesFrom Arc HydroFrom Arc Hydro– Drainage LinesDrainage Lines

– With DrainID of DrainageLine = HydroID of SubbasinWith DrainID of DrainageLine = HydroID of Subbasin

Land Use ShapefileLand Use Shapefile

1992 Land Use1992 Land Use– Downloaded from Downloaded from

SeamlessSeamless– Used ArcGIS ToolsUsed ArcGIS Tools

To Convert To Convert fromfromRaster to a PolygonRaster to a Polygon

To Clip Polygon into To Clip Polygon into shape of Watershedshape of Watershed

Land Use TablesLand Use Tables

Defines how each Defines how each type of land use is type of land use is treated in HSPFtreated in HSPF

HSPFHSPF

Forcing DataForcing Data

Precipitation DataPrecipitation Data

NCDC Daily Precipitation DataNCDC Daily Precipitation Data– Years 2000 through 2004Years 2000 through 2004

Evaporation DataEvaporation Data

NCDC Daily Evaporation DataNCDC Daily Evaporation Data– Years 2000 through 2004Years 2000 through 2004

Canyon Dam

SeaWorld SAT

Beeville 5 NE

Choke Canyon DAM

Coleto Creek Res.

Interpolation ComparisonInterpolation Comparison

NEXRAD, August 27, 2001NEXRAD, August 27, 2001

Data Interpolation ChoicesData Interpolation ChoicesNEXRADNEXRAD KrigingKriging

Data Interpolation ChoicesData Interpolation ChoicesNEXRADNEXRAD IDWIDW

When averaged over catchments there is a 61% average difference.

Data Interpolation ChoicesData Interpolation ChoicesNEXRADNEXRAD Spline - RegularSpline - Regular

Negative Negative Rain !!Rain !!When averaged over catchments there is a 35% average

difference.

HSPF Forcing DataHSPF Forcing Data

HSPFWDM File

NCDCMonthly

Data

Arc GISZonal

Statistics

HSPFHSPFOutput & CalibrationOutput & Calibration

HSPF OutputHSPF Output

HSPF OutputHSPF Output

Future Work• Calibration• Calibration• Calibration

Thanks…Thanks…

Nate JohnsonNate JohnsonJon GoodallJon Goodall

Gil StrassbergGil StrassbergCarrie GibsonCarrie Gibson

AndAnd

Dr. David MaidmentDr. David Maidment

Questions ?Questions ?