The outflow of Windermere,Cumbria: A re-appraisal

Possible causes for the outflow of Windermere through the Leven valley instead of the Cartmel valley are discussed. An earlier seismic investigation of the problem by Coster and Gerrard (1947) is reviewed and shown to be inconclusive. Further geophysical surveying and mapping demonstrate a rock bar in the Cartmel valley, 3km southeast of Newby Bridge. This barrier is 21m above the present water level in Windermere. Blockage by glacial deposits is disproved and the probable history of the outflow discussed. It is concluded that the outflow from Windermere has used the Leven valley from an early stage.