?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax in order to improve their display. Uncheck the box to turn MathJax off. This feature requires Javascript. Click on a formula to zoom. ABSTRACT A multi-reservoir machine learning model has been built for seasonal to subseasonal reservoir storage predictions on a monthly timestep, including a range of reservoirs from the UK, France and Spain; and applied in forecast mode in the UK.