The survey data was compiled by Friends of the Upper Wye’s team of volunteers over the 2022 bathing season (May 15 to September 30).
Lluniwyd data’r arolwg gan Ffrindiau’r Afon Gwy Uchaf sy'n dîm o wirfoddolwyr dros dymor ymdrochi 2022 (15 Mai tan 30 Medi).