Abstract

Runoff Modeling of the Luxapallila Creek Watershed Using Gridded and Lumped Models

Author(s): Diaz-Ramirez, J. ;  Johnson, B.;  McAnally, W.;  Ramirez-Avila, J.

The Northern Gulf Institute is funding a project focus in improving watershed-wide decision support for resource management agencies; one of the tasks in this project is define the sensitivity of rainfall-runoff results to use of advanced tools, such as the Corp’s distributed hydrologic model Gridded Surface Subsurface Hydrologic Analysis (GSSHA) and the EPA Hydrologic Simulation Program—FORTRAN (HSPF). GSSHA is a physics based watershed model simulating 2D overland flow, 1D channel flow, and surface water/groundwater interaction. The HSPF software is a conceptual, continuous, lumped parameter watershed model that has been extensively used around the world since 1980. This study evaluates the GSSHA and HSPF runoff performance in the Luxapallila Creek watershed, Alabama and Mississippi. The 1,851 km2 watershed drains into the Tombigbee River. Six NOAA raingauge stations are used as hourly input precipitation. Land use distribution using the 1980 GIRAS database shows 73% forest, 20% agricultural land, and 6% wetlands. USGS 30-m resolution digital elevation models (DEMs) are used to delineate and calculate physiographic parameters (e.g., area, slope, and length of slope). The State Soil Geographic (STATSGO) database depicts mainly sandy loam soils. The GSSHA model grid size is 100 m x 100 m, resulting in 185,816 grids. The HSPF model is divided in 50 subwatersheds. Daily streamflow data collected by the USGS at the 02443500 station are used for model evaluation. The Web-based hydrograph separation system (WHAT) is used to calculate runoff and baseflow from observed streamflow data. Observed and simulated runoff data are evaluated using the following statistics: peak error, volume error, flow error, and peak time error. Four storm events are analyzed for the period 01/01/1989 to 03/31/1989. GSSHA peak, volume, and flow errors were around half of HSPF results. Both models showed ahead peaks of one day. However, the GSSHA model results matched the peak of two out of four storm events. The HSPF model runs faster than GSSHA (5 seconds vs 20 hours). GSSHA and HSPF groundwater modules will be setup and evaluated.







 

Technical Presentations

  • Delta Water Quality
  • Delta Water and Agriculture
  • Wetlands
  • Water Quality
  • Sediments
  • Non-Point
  • Management and Sustainability
  • Wood Treatment
  • Modeling
  • Soil and Water Treatment

Workshops

Responsible Site Design: Implementing Innovative Stormwater Management Strategies

The primary goal of the workshop is to create a dynamic learning experience that examines the role of stormwater management in the built environment. The workshop will focus on integrating ecologically sound water management approaches into site design. After the workshop, attendees will be familiar with the following concepts and technical issues:

  • Knowledge of the stormwater treatment chain
  • Knowledge of the impact of land use codes on stormwater management
  • Application of a design process that mitigates the effects of stormwater on-site
  • Knowledge of the relationship between land use codes and design for innovative stormwater management

Information

For information contact:
Jessie Schmidt
MWRRI
Box 9680
Mississippi State, MS 39762
662-325-3295
jschmidt@cfr.msstate.edu