Patricia Haan Haan, P. K., & Skaggs, R. W. (2003). Effect of parameter uncertainty on DRAINMOD predictions: I. Hydrology and yield. Transactions of the ASAE, 46(4), 1061–1067. https://doi.org/10.13031/2013.13968 Haan, P. K., & Skaggs, R. W. (2003). Effect of parameter uncertainty on DRAINMOD predictions: II. Nitrogen loss. Transactions of the ASAE, 46(4), 1069–1075. https://doi.org/10.13031/2013.13969