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Table 1 Lengths/areas for each water body type in GB used for A. filiculoides management cost calculations

From: A century of Azolla filiculoides biocontrol: the economic value of Stenopelmus rufinasus to Great Britain

Freshwater system

England and Wales

Scotland

References

Rivers and streams (km)

172,123a

125,000

(Riley et al. 2018; Critchlow-Watton et al. 2014; Scotland’s Environment Web 2019)

Canals and feeders (km)

2717

220

(Canal & River Trust 2020; Critchlow-Watton et al. 2014; Scotland’s Environment Web 2019)

Drainage channels (km)

22,000b

14

(Association of Drainage Authorities 2017, 2018, 2022a, b)

Ditches (km)

391,934

208,066

(Riley et al. 2018; Brown et al. 2006)c

Lakes and ponds (standing waters) (km2)

902

1296

(Hughes et al. 2004)d

  1. Potential for some overlap of water bodies e.g. ditches (primarily agricultural) and drainage channels; drainage channels and rivers/canals etc. Figures intended to be indicative
  2. aExtrapolated from stream lengths cited at 73.4% of total running water network in England and Wales to 100% to include rivers
  3. bApproximate across several sources
  4. c600,000 across GB divided proportionately by area for England, Wales and Scotland
  5. dArea by country estimated as proportion of total area of standing waters for GB. Proportions based on number of lakes recorded per country out of total number for GB as proxy
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CABI Agriculture and Bioscience

ISSN: 2662-4044