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The canal always had problems with its water supply due to springs breaking through the clay lining of the canal bed. This meant that in summer when the springs receded the rate of water loss was greater than the available supply. In one of the attempts to tackle this the size of the locks was reduced giving the canal locks their unusual double headed appearance. In a further attempt to prevent water loss the canal directly after the coates portal of the tunnel (know as the King's Reach) was lined with concrete rather than the normal puddle clay
The canal was abandoned in 1933 and is now being restored. A number of locks have been rebuilt however the Sapperton tunnel remains blocked by two rock falls.