ɪts kˈætʃmənt ˈɛɹiə wʌz ɹˈɛlətˌɪvli smˈɔːl bˌʌt ðə ʃˈeɪp ʌvðə vˈæli ænd ɪts dʒɪˈɑːlədʒi ɛnˈeɪbəld ðə kənstɹˈʌkʃən əvɚ ɹˈɛlətˌɪvli hˈaɪ wˈɔːl ðæt wʊd stˈoːɹ ʌv wˈɔːɾɚ, ɹˈiːtʃɪŋ ɐ mˈæksɪməm wˈɔːɾɚ dˈɛpθ ɪnðə ɹˈɛzɚvwˌɑːɹ ʌv .
Its catchment area was relatively small but the shape of the valley and its geology enabled the construction of a relatively high wall that would store  of water, reaching a maximum water depth in the reservoir of .