skip to main content skip to navigation Skip to accessibility page
SNH website Natural Resources Wales logo Natural England logo Standing Waters Database
SNH Home
You are here: SNH Home > wetlands > Standing Waters Database > Site Search > Site
  • Home Page
  • Site Search
    • Search
    • Search by Map
    • Lake Groups
  • Queries
    • Queries
    • OS Map
    • Geology
    • Macrophyte Species
    • NVC Type
    • Macrophytes by Designated Site
    • National Nature Reserve
    • Site of Special Scientific Interest
    • Special Area of Conservation
    • Alien Macrophytes
  • SNH Area Queries
    • SNH Area Queries
    • Surveyed Sites
    • Altitude/Surface Area
    • SNH Area Geology
    • SNH Area Lake Groups
    • Water Chemistry
    • Species
    • Macrophytes by lake
    • Potamogeton Taxa
    • Charophyte Species
    • NVC Communities
    • Designated Sites
    • Lochs in Designated Site
    • Macrophytes in Designated Site
    • Local Authority
  • References
    • References
    • Macrophyte list
    • Glossary of Terms
    • Links

Site Information


Site Code CW0024
Site Name Llyn Alwen
Site Survey Documentation PDF
Currently there are no site survey documents available for site CW0024

Surveys


Survey Title Date Surveyor
86 Integrated classification and assessment of lakes in Wales: Phase IV Final report (CCW science report no. 214) 14-JUL-96 Don Monteith, Tim Allott, Helen Bennion, Laurence Carvalho, Catherine Duigan, R. Harriman, Alex Kirika, J Hutchinson, J M Seda

Site Location


Grid Reference SH898567
Easting 289800
Northing 356700
Altitude (m) 380
Island Name Mainland
Country Wales
OS Map  
UK Lakes Portal UK Lakes Portal









Responsible Water Agency Agency Area
Natural Resources Wales (NRW) links to an external site Wales

Site Characteristics


Site Origin Natural Lake
Surface Area (ha) 26.00
Catchment Area (ha) 130
Max Dimension (m)  
Max Depth (m) 13.5
Mean Depth (m) 6
Retention Time 400
Houses  
Roads  
Lake Group (Duigan 2006) C1 - Northern, usually small to medium-sized, acid, largely mountain lakes, with a limited range of plants, but Juncus bulbosus and Sparganium angustifolium constant.
Lake Type (Palmer 1992)  
PLEX Score 3.69





Data Copyright Owner
Natural Resources Wales (NRW) links to an external site

Natural Resources Wales (NRW) website




  • Return to site search
  • Return to interactive map search
Accessibility    Copyright    Links    Contacts    Sitemap    Privacy and cookies