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The Upper North Bosque River watershed is an impaired watershed due to high loadings of P. The watersheds primary agricultural activity is dairy production and large quantities of manure are produced. A best management practice that has been proposed is to use composted dairy manure in commercial turfgrass operations to remove manure from the watershed. When turfgrass sod is harvested a thin layer of soil is also removed. Therefore excess P bound to the soil can be transported out of the watershed in a sustainable manner. The Soil and Water Assessment Tool (SWAT) was calibrated to simulate the effectiveness of using turfgrass sod fertilized with composted dairy manure to export P from the watershed. The model was first calibrated to predict average monthly flows and sediment loadings from 1996 to 1999. The Nash- Sutcliffe model fit efficiency was used for evaluating the model. The model fit efficiency was 0.81 for flow and 0.53 for sediment loading.