Location: Water Quality and Ecology Research
Project Number: 6060-13660-008-15-S
Project Type: Non-Assistance Cooperative Agreement
Start Date: Sep 30, 2017
End Date: Sep 29, 2022
1. Develop specific modules within AnnAGNPS to simulate the unique hydrological and water quality conditions in rice fields in the Sacramento River basin, California. 2. Develop methods to integrate existing rice simulation models with AnnAGNPS to evaluate rice farming management practices and their impact on water quality.
ARS and the University of California-Davis will work to improve the simulation of hydrodynamic and pesticide technology for irrigated rice fields. Generally, they can be represented as a ponded condition for use with hydrologic simulations. AnnAGNPS has a rice pond module designed for Louisiana conditions, which includes runoff, sediment, and nutrient components, but has only been evaluated for water balance. The pesticide algorithms associated with rice ponds will be improved and evaluated. The water balance approach along with improved irrigation management scheduling will be improved to include conditions for California rice production practices. Other field level rice models will be linked to AnnAGNPS as an option to simulate pesticide fate providing an upscale water/loading capabilities to watershed scale simulations using AnnAGNPS. Data will be collected and prepared for model inputs, including geospatial data on topography, soil, land use and land cover, hydrography, meteorology, geology, and habitat as well as pesticides usage data from the California Pesticide Use Database. This data will be used for calibration and validation of the simulations.