The people who are responsible for managing reservoirs use the same idiots who forecast about global warming to do their long term forecasting, and they are usually incorrect. For example in 2017, the long term forecast for CA was continued drought like conditions, so at LADWP we held water in our reservoirs to prepare for another year of drought, then BAM. We had the wettest year on record for our watershed, and we couldn't get rid of water fast enough.
The people who are responsible for managing reservoirs use the same idiots who forecast about global warming to do their long term forecasting, and they are usually incorrect. For example in 2017, the long term forecast for CA was continued drought like conditions, so at LADWP we held water in our reservoirs to prepare for another year of drought, then BAM. We had the wettest year on record for our watershed, and we couldn't get rid of water fast enough.