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GIS-BASED HYDROLOGIC MODELING: THE AUTOMATED GEOSPATIAL WATERSHED ASSESSMENT TOOL. Bill Kepner and Darius Semmens US – EPA Landscape Ecology Branch Las Vegas, NV David Goodrich, Mariano Hernandez, Shea Burns, Averill Cate, Soren Scott, Lainie Levick, Evan Canfield

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GIS-BASED HYDROLOGIC MODELING: THE AUTOMATED GEOSPATIAL WATERSHED ASSESSMENT TOOL

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GIS-BASED HYDROLOGIC MODELING:THE AUTOMATED GEOSPATIAL WATERSHED ASSESSMENT TOOL

Bill Kepner and Darius Semmens

US – EPA Landscape Ecology Branch Las Vegas, NV

David Goodrich, Mariano Hernandez, Shea Burns, Averill Cate, Soren Scott, Lainie Levick, Evan Canfield

USDA-ARS Southwest Watershed Research Center, Tucson, AZ

Phillip Guertin

University of Arizona, Tucson, AZ

Scott Miller

University of Wyoming, Laramie, WY


Introduction

  • PC-based GIS tool for watershed modeling

    • KINEROS & SWAT (modular)

  • Investigate the impacts of land-use/cover change on runoff, erosion, and water quality at multiple scales

  • Compare and visualize results

  • Targeted for use by research scientists and management specialists

  • Analyses can be integrated with those from other GIS- based tools & data

  • Widely applicable & free


Objectives of the AGWA tool

  • Compatible with US-EPA Analytical Tool Interface for Landscape Assessment (ATtILA)

  • Simple, direct method for model parameterization

  • Provide accurate, repeatable results

  • Utilize basic, commonly available GIS data

  • Assess impacts of land-use/cover change

  • Useful for scenario development, alternative futures simulation work (forecasted change)


KINEROS Outputs

SWAT Outputs

Channel Infiltration (m3/km)

Precipitation (mm)

Plane Infiltration (mm)

ET (mm)

Runoff (mm or m3)

Percolation (mm)

Sediment yield (kg)

Channel Disch. (m3/day)

Peak flow (m3/s or mm/hr)

Transmission loss (mm)

Channel Scour (mm)

Water yield (mm)

Sediment discharge (kg/s)

Sediment yield (t/ha)

AGWA Conceptual Design: Inputs and Outputs

Watershed Delineation using Digital Elevation Model (DEM)

Watershed Discretization

(model elements)

Intersect model elements with

+

Soils

Land

Cover

Output results that can be displayed in AGWA

Rain

(Observed or Design Storm)

Run model and import results

Results


High urban growth

1973-1997

Sierra Vista Subwatershed

KINEROS Results

Concentrated urbanization

ARIZONA

Phoenix

#

Tucson

#

SONORA

Forest

Oak Woodland

Mesquite

Desertscrub

Grassland

Urban

1997 Land Cover

  • Using SWAT and KINEROS for integrated watershed assessment

  • Land-cover change analysis and impact on hydrologic response

Spatial and Temporal Scaling of Results

Upper San Pedro

River Basin

N

Water yield change between 1973 and 1997

<<WY >>WY

SWAT Results


Land-Cover Modification Tool

  • Allows users to build and test management scenarios

  • Location of land-cover alterations specified by either drawing a polygon on the display, or specifying a polygon map

  • Types of Land-Cover Changes:

  • Change entire user-defined area to new land cover

  • Change one land-cover type to another in user-defined area

  • Change land-cover type within user-supplied polygon map

  • Create a random land-cover pattern

    • e.g. simulated burn pattern

  • Example of land-cover change (mesquite removal) and associated hydrologic impacts


AGWA Applications

  • Engineering design – optimizing placement and sizing of retention basins for storm-water recharge to capture excess flows resulting from urbanization

  • Planning – hydrologic impacts of alternative growth scenarios

  • TMDLs – locating potential impairment (cheap & quick)


Integration of AGWA and ATtILA

  • Exploits landscape characterization functionality of ATtILA to improve parameterization of SWAT in AGWA

  • Incorporates outputs (e.g. sediment yield) from AGWA back into landscape metric assessments

  • Examples from Arizona (Hernandez et al., 2003) and Oregon (in progress)

Hernandez et al., 2003, Integrating a landscape/hydrologic analysis for watershed assessment. Proceedings of the First Interagency Conference on Research in the Watersheds, Benson, AZ October 27-30, 2003.


AGWA Milestones

  • AGWA 1.1 released at the Fed. Interagency Hydrologic Modeling Conference, July 2002.

  • AGWA was added to the new ORD Council for Regulatory Environmental Modeling (CREM) database in January, 2004

  • AGWA 1.4 released in July, 2004

  • AGWA was exhibited as a TMDL tool at the 2004 EPA Science Forum Product Expo

  • AGWA was integrated into the BASINS 3.1 release

  • in August, 2004

  • Training: Las Vegas (2001); Reston (2002); Tucson (2003); San Diego (2004); India (2005); Bulgaria (2005)

  • 850 registered users – April 2005


Key Improvements for National Application

AGWA/BASINS Integration

  • Elevation bands for SWAT

  • SSURGO soil parameterization for SWAT

  • Enhanced ground-water parameterization for SWAT

  • Multiple hydraulic-geometry relations for channel characterization

  • Land-Cover Modification Tool – scenario development

  • Reservoirs (SWAT), and ponds (KINEROS)

  • FAO Soils – transborder applications


Applications

  • National

    • NYCDEP – Catskill/Delaware

    • USDA-ARS & Upper San Pedro Partnership – Arizona

    • EMAP – Oregon (AGWA-ATtILA)

    • ReVA – SEQL

    • Region 10 – Kenai Peninsula, Alaska

  • International

    • NATO – Committee on the Challenges to Modern Society (CCMS)

    • Southwest Consortium for Environmental Research and Policy (SCERP) – U.S./Mexico

    • UNESCO – Global Network for Water and Development Information (G-WADI)


AGWA Support & Distribution

  • Research Plan

  • Code structure diagrams

  • Training exercises (4)

  • Data (FAO soil, NWS gauge, & training exercise data)

  • Journal Publications (e.g. Hernandez et al. 2000, Miller et al. 2002a, Miller et al. 2002b, Kepner et al. 2004, Semmens & Goodrich 2005; Goodrich et al. 2005)

  • Community Bulletin Board

  • All available on EPA and USDA/ARS companion Websites:

  • Fact Sheets, Product Announcement, Brochures

  • Documentation and User Manuals for AGWA and BASINS-AGWA (html & pdf)

  • Quality Assurance Report

http://www.epa.gov/nerlesd1/land-sci/agwa/

http://www.tucson.ars.ag.gov/agwa/


Future Directions

Migrating to ArcGIS (AGWA 2.0) and the Internet (DotAGWA)

  • Detailed, peer reviewed design plan completed March, 2005

  • Compatible with plans for BASINS and ATtILA

  • Developed using standards-based technology allowing AGWA components to be utilized by other applications and visa versa

  • Facilitates integration of other models/tools


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