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An Agricultural Package for MODFLOW 6 Using the Application Programming Interface.

Joshua D Larsen1, Christian D Langevin2, Joseph D Hughes3

  • 1U.S. Geological Survey, California Water Science Center, Sacramento, California, USA.

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Summary
This summary is machine-generated.

A new MODFLOW 6 package simulates agricultural water use, enhancing groundwater modeling with deficit irrigation and multi-aquifer well support. This tool improves the representation of complex, managed water systems.

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Area of Science:

  • Groundwater Hydrology
  • Water Resource Management
  • Computational Hydrogeology

Background:

  • Accurate simulation of agricultural water use is crucial for sustainable groundwater management.
  • Existing MODFLOW packages have limitations in representing complex irrigation practices.
  • The MODFLOW Application Programming Interface (API) offers a flexible framework for package development.

Purpose of the Study:

  • To develop and validate a new agricultural water use package for MODFLOW 6 using the API.
  • To enhance the simulation of irrigation demand, including deficit and over-irrigation scenarios.
  • To expand support for diverse irrigation providers and grid types within MODFLOW.

Main Methods:

  • Development of the MODFLOW API Agricultural Water Use Package (API-Ag) based on prior AG Package approaches.
  • Implementation of new features: deficit/over-irrigation, Multi-Aquifer Well and Lake Package support.
  • Validation using three example problems demonstrating improved representation of managed systems.

Main Results:

  • The API-Ag Package successfully simulates irrigation demand and delivery.
  • New features provide a more realistic representation of agricultural water use.
  • Simulated irrigation volumes show excellent agreement with the MODFLOW-NWT AG Package.

Conclusions:

  • The API-Ag Package is a valuable advancement for MODFLOW 6, improving the simulation of agricultural water use.
  • It offers enhanced capabilities for modeling highly managed groundwater systems.
  • The package supports a wider range of irrigation scenarios and model configurations.