æt hˈaɪ wˈɔːɾɚ lˈɛvəlz, pˈɛntwɪn ɹˈɛzɚvwˌɑːɹ ɪz kəntˈɪnjuːəs wɪð pˈɔntstɪsˌɪl ɹˈɛzɚvwˌɑːɹ, ɪts dˈæm bˌiːɪŋ səbmˈɜːdʒd.
At high water levels, Pentwyn Reservoir is continuous with Pontsticill Reservoir, its dam being submerged.