Study on Interval Estimation Method for Effluent Loads from a Catchment

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This study is aimed at seeking the adequate interval estimate method of effluent loading from diffuse source, such as forested or agricultural catchment. A configuration of confidence interval was based on the bootstrap method. As a results, the best performance was attained with the interval estimation method that combined periodical sampling with 7 parameters model of USGS Load Estimator applying bias correction by composite method for dissolved ions. In contrast, the best performance was achieved with the interval estimation method that combined probabilistic SALT sampling with power type loading-discharge rate regression model applying no bias correction for suspended solids. However the interval estimation method for dissolved ions still has rooms for improvement.