This is because much more water is absorbed along its course than with the Diamantina or Georgina , but could possibly be also because centennial or multicentennial wet and dry cycles in those basins causing them to regularly reach the lake during wet periods ( there is some evidence from terraces around Lake Eyre that this occurred during the Medieval Warm Period ) .
One reason is that much more water is lost than with the Diamantina or Georgina .