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Water Quality Simulation of Rice/Crawfish Fields within Annualized AGricultural NonPoint Source Pollution Model

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  032061,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13765) @2003
Authors:   Yongping Yuan, Ronald Bingner, Fred Theurer, Steve Kolian
Keywords:   AnnAGNPS, rice/crawfish management practices, field pond feature in AnnAGNPS. Impact of effluent of rice/crawfish pond on water quality

Rice and crawfish farming are important agricultural management practices in the state of Louisiana. The effluent from rice/crawfish ponds is an environmental concern because of high sediment and nutrient concentrations. Watershed models are frequently used for watershed evaluations for Best Management Practices (BMPs) recommendations and Total Maximum Daily Loading (TMDL) allocation. However, current available models used for TMDLs development such as BASIN, SWAT and AGNPS do not have the capability of simulating the impact of rice/crawfish ponds on the receiving water bodies.

A field pond component was built into AnnAGNPS to account for the impact of water quality of effluents from rice/crawfish ponds to the receiving water bodies. Both hydrologic and pollutant mass balances are maintained in the pond. For hydrologic balance, inflows, outflows, precipitation, infiltration, and evaporation if the pond is not vegetated or evapotranspiration if the pond is vegetated are considered. Outflow from the pond is added to a AnnAGNPS reach that is linked to a AnnAGNPS cell.

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