A rainfall runoff model described in this paper which is based on Basin-wide Ecological Model(BAWEM) calculates the fate of agro-chemicals in a watershed located on golf links. The rainfall runoff coefficients of agro-chemicals, which are the dominant parameters to predict the movement of agro-chemicals from soil and turfgrass to downstream water, are estimated. Also, the model is used to estimate the level of health risks the residents around golf links are exposed to. The fidelity of rainfall runoff model of agro-chemicals was validated by the observed data obtained during rainy period. The calculated results from this model were found to be in the same order as that of the observed. The rainfall runoff coefficients of four agro-chemicals used in golf links were 5.4×10−3, 1.9×10−3, 3.0×10−4 and 4.4×10−3 for flutolanil, isoprothiolane, chlorpyrifos and simazine, respectively. The health risk level to the residents around golf links is evaluated to be rather low: the ratio of estimated dose through drinking water to the 10% of ADI value or VSD for 10−6 life time risk varied in the range of 0.005~0.04 and 0.003~0.11, respectively, for both the annual mean and maximum monthly mean cases.

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