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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

Hydrologic Studyof the Sandies & Elm Watershed

Jessica L. Watts


Research project background

Sandies River

Elm River

Research Project Background

  • TCEQ TMDL Study

    • Bacteria

    • Low Dissolved Oxygen


Semester project overview
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 hydro watershed delineation

Arc HydroWatershed Delineation


Arc hydro input requirements
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 Subbasin Delineation

Arc Hydro

  • Terrain Preprocessing

  • Watershed Processing

    • 35 Subbasins

      • (limited by HSPF)



Arc hydro to hspf1
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
Subbasin Delineation

  • From Arc Hydro

    • Subwatershed

  • With unique HydroID for each area


Drainage lines
Drainage Lines

  • From Arc Hydro

    • Drainage Lines

  • With DrainID of DrainageLine = HydroID of Subbasin


Land use shapefile
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
Land Use Tables

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




Precipitation data
Precipitation Data

  • NCDC Daily Precipitation Data

    • Years 2000 through 2004


Evaporation data
Evaporation Data

  • NCDC Daily Evaporation Data

    • Years 2000 through 2004

Canyon Dam

SeaWorld SAT

Coleto Creek Res.

Choke Canyon DAM

Beeville 5 NE


Interpolation comparison

NEXRAD, August 27, 2001

Interpolation Comparison



Data interpolation choices1
Data Interpolation Choices

  • IDW

  • NEXRAD

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


Data interpolation choices2
Data Interpolation Choices

  • Spline - Regular

  • NEXRAD

Negative Rain !!

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


Hspf forcing data

NCDC

Monthly Data

Arc GIS

Zonal Statistics

HSPF

WDM File

HSPF Forcing Data


Hspf output calibration
HSPFOutput & Calibration



Hspf output1
HSPF Output

  • Future Work

  • Calibration

  • Calibration

  • Calibration


Thanks
Thanks…

Nate Johnson

Jon Goodall

Gil Strassberg

Carrie Gibson

And

Dr. David Maidment

Questions ?


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