- liverpool- area of stress (high population, low rainfall, few rivers)
- other areas of stress- (Oxford, Birmingham, Coventry) need increased levels of water from river severn so the river severn needs a higher discharge to sustain this.
- water taken from lake vyrnwy (area of surplus) via aquaduct to liverpool (area of stress) to increase amounts of water in Liverpool.
- lake clywedog regulates river severn
- winter- enough water in river severn