Hydrologic study of the sandies elm watershed
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Hydrologic Study of the Sandies & Elm Watershed. Jessica L. Watts. Sandies River. Elm River. Research Project Background. TCEQ TMDL Study Bacteria Low Dissolved Oxygen. Semester Project Overview. Objective:

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Hydrologic Study of the Sandies & Elm Watershed

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Hydrologic Studyof the Sandies & Elm Watershed

Jessica L. Watts


Sandies River

Elm River

Research Project Background

  • TCEQ TMDL Study

    • Bacteria

    • Low Dissolved Oxygen


Semester Project Overview

Objective:

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

Tasks:

  • Arc Hydro Watershed Delineation

  • Arc Hydro To HSPF

  • HSPF Forcing Data

    • Interpolation Comparison

  • HSPF Output Calibration


Arc HydroWatershed Delineation


Arc Hydro Input Requirements

  • Digital Elevation Model

    • Seamless ( http://seamless.usgs.gov/ )

      • United States

        • 1/3” National Elevation Dataset

  • NHD Flowlines

    • USGS – National Hydrography Dataset

      ( http://nhd.usgs.gov/data.html )

      • High Resolution


Arc Hydro Subbasin Delineation

Arc Hydro

  • Terrain Preprocessing

  • Watershed Processing

    • 35 Subbasins

      • (limited by HSPF)


Arc Hydro to HSPF


Arc Hydro to HSPF

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

Arc Hydro To HSPF

Models and Tools

Created by Nate Johnson


Subbasin Delineation

  • From Arc Hydro

    • Subwatershed

  • With unique HydroID for each area


Drainage Lines

  • From Arc Hydro

    • Drainage Lines

  • With DrainID of DrainageLine = HydroID of Subbasin


Land Use Shapefile

  • 1992 Land Use

    • Downloaded from Seamless

    • Used ArcGIS Tools

      • To Convert from

        Raster to a Polygon

      • To Clip Polygon into shape of Watershed


Land Use Tables

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


HSPF


Forcing Data


Precipitation Data

  • NCDC Daily Precipitation Data

    • Years 2000 through 2004


Evaporation Data

  • NCDC Daily Evaporation Data

    • Years 2000 through 2004

Canyon Dam

SeaWorld SAT

Coleto Creek Res.

Choke Canyon DAM

Beeville 5 NE


NEXRAD, August 27, 2001

Interpolation Comparison


Data Interpolation Choices

  • Kriging

  • NEXRAD


Data Interpolation Choices

  • IDW

  • NEXRAD

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


Data Interpolation Choices

  • Spline - Regular

  • NEXRAD

Negative Rain !!

When averaged over catchments there is a 35% average difference.


NCDC

Monthly Data

Arc GIS

Zonal Statistics

HSPF

WDM File

HSPF Forcing Data


HSPFOutput & Calibration


HSPF Output


HSPF Output

  • Future Work

  • Calibration

  • Calibration

  • Calibration


Thanks…

Nate Johnson

Jon Goodall

Gil Strassberg

Carrie Gibson

And

Dr. David Maidment

Questions ?


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