In 2010 a survey of the distribution of water voles within two different drainage board districts – Ransonmoor District Drainage Commissioners and Curf Fen, part of Wimblington Combined IDB. This was carried out as a post graduate project by Yuping Chen, studying at the University of East Anglia.
It repeated a survey carried out by The Wildlife Trust, Cambridgeshire in 2005 of the same areas. The results showed that the water vole population in drainage board maintained ditches at Ransonmoor was still at the high level of occupation of the 2005 survey, over 80%, but occupation in Curf Fen maintained ditches, (Wimblington Combined IDB), had increased during the five-year interval from 61% to 74%. There was also an increase in water vole populations in the privately owned side ditches at Curf Fen from 25% to nearly 32%.