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Eugenio Molina Navarro

SWAT-MODFLOW: Recent Applications and an Introduction to Version 3

Research output: Contribution to conferenceConference abstract for conferenceResearch

  • Ryan T. Bailey, Colorado State Univ, Colorado State University, Dept Civil & Environm Engn, Colorado State University
  • ,
  • Eugenio Molina Navarro
  • Wei Liu
  • Xiaolu Wei, Colorado State Univ, Colorado State University, Dept Civil & Environm Engn, United States
  • Dennis Trolle
SWAT-MODFLOW, a surface/subsurface hydrologic flow model that couples the SWAT and MODFLOW modeling codes, is being used in many regions worldwide to address a variety of water supply and water management issues. A version of the code that employs the groundwater reactive transport code RT3D within MODFLOW also is being used to assess implications of nutrient management for groundwater and surface water. This presentation summarizes the recent uses of SWAT-MODFLOW and outlines updates to the modeling code. The current published SWAT-MODFLOW code (Version 2 on the SWAT website) recently has been applied to watersheds in Oregon (USA), Colorado (USA), Mississippi (USA), the Ogallala Aquifer Region (USA), Canada, Wales, and Iran. This presentation introduces Version 3, which includes the following new features: (1) linking groundwater pumping to irrigation, with pumping rate dictated either by prescribed MODFLOW pumping rates or by SWAT auto-irrigation routines; (2) linking groundwater drainage from MODFLOW’s drain package to SWAT subbasin channels; (3) the use of a groundwater delay term to represent groundwater travel time from the soil profile to the water table; and (4) an updated groundwater balance that includes recharge, drainage, groundwater discharge to streams, stream seepage to groundwater, groundwater storage change, groundwater inflow/outflow due to aquifer boundary conditions, and ET from shallow groundwater. Version 3 is accompanied by a revised tutorial that includes step-by-step instructions for including these new features into SWAT-MODFLOW applications. The tutorial also provides instructions for preparing RT3D input files for groundwater nutrient transport. The source code, executable, and tutorial for Version 3 are available on the SWAT website (https://swat.tamu.edu/software/swat-modflow/). Applications of Version 3 to watersheds in Denmark and Colorado (USA) are described briefly.
Original languageEnglish
Publication year19 Jul 2019
Publication statusPublished - 19 Jul 2019
EventSWAT conference - Vienna, Austria
Duration: 15 Jul 201919 Jul 2019


ConferenceSWAT conference

    Research areas

  • SWAT-MODFLOW, Surface-subsurface, Hydrological model, RT3D, Hydrology

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