The article "A large sample analysis of European rivers on seasonal river flow correlation and its physical drivers" has been just published on Hydrology and Earth System Sciences.
The article is open access and can be reached here. I believe this paper is significant in that it explores the opportunity of statistically predicting high and low flows in rivers with weeks in advance, by exploiting the "river memory" properties.
It is a further step forward to contribute to the the relevant research challenge of exploring river flow dynamics and variability.
Thank you for your interest!