The Statewide Agricultural Production (SWAP) model is a multi-region, multi-input and output economic optimization model of the agricultural economy in California. The current model version covers over 93 percent of irrigated production in the state with primary regions in the Central Valley, Southern California, and the Central Coast. The model is currently used for policy analysis and planning by consultants and state and federal agencies. More information about the development and use of the model is available here.
Some of the key features of the SWAP model include:
The SWAP model is a fully calibrated optimization model which is well-suited to estimate spatially heterogenous commodity, resource, and input specific policies. Projects span a wide range of applications over many years. Some recent examples include:
Research collaborator, Research Scientist in Civil and Environmental Engineering at UC Davis.Duncan MacEwan
Research collaborator, Consultant Economist at ERA Economics.Jay Lund
Research collaborator, Ray B. Krone Professor of Environmental Engineering and Director of the Center for Watershed Sciences at UC Davis.
Welcome to the updated SWAP website! Please look around and check back frequently as we add to the site and upload more information.4-01-2014
UC Davis and ERA Economics are working with CDFA, DWR, and other agencies to update the SWAP model code and database. Check back for project progress!8-23-2012
Researchers are collaborating with the Stockholm Environment Institute to integrate SWAP and the Water Evaluation and Planning Model (WEAP) into a comphrensive economic-hydrologic framework.8-23-2012
Professor Howitt is currently working on a version of SWAP which fully calibrates using Generalized Maximum Entropy and includes Decreasing Returns to Scale CES regional production functions. Multiple years of land use observations can be used to improve calibration in this framework.8-1-2012
In collaboration with CH2M HILL and Reclamation researchers have developed a module to estimate policies in accordance with Federal Principles and Guidelines. The USBR adopted SWAP as their offical model following this effort.6-15-2012
Researchers have integrated SWAP with the CALVIN model hydrologic network to estimate the effect of South-of-Delta agricultural water markets. Results of this analysis are published in the peer-reviewed SWAP paper.