Update: Our review paper, ‘Using R in hydrology: a review of recent developments and future directions‘, has been accepted, and excitingly is the most downloaded paper in HESS in the last 12 months! (https://www.hydrol-earth-syst-sci.net/most_downloaded_recent.html)
The PDF can be downloaded here: https://www.hydrol-earth-syst-sci.net/23/2939/2019/ 
Hydro-climate extremes, University of Oxford 