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Texas Water Development Board (TWDB) has been studied and estimated the total fresh water inflow to bays in Texas using TxRR (Texas Rainfall Runoff) model. Recently, TWDB requested to develop and apply the SWAT model using up to date technologies for estimating inflow, sediment and nutrient loads to the bays. In 2011, SWAT (Soil and Water Assessment Tool) model was developed and applied for estimating inflow to the bays over TxRR by Lee et al. In this study, SWAT model was used to estimate sediment and nutrient loading from a coastal watershed based on the developed model in 2011.