Sacramento model

Kuzmin etal [25] suggests we can lock down 5-7 Sac params without losing any predictive power. Is this really true?

Kuzmin, V., Dong-Jun, S., and Koren, V., Fast and efficient optimization of hydrologic model parameters using a priori estimates and stepwise line search, Journal of Hydrology, 353, 109-28, 2008.