The 750mm diameter culvert was extended, a new headwall and grid were installed, and an associated hardstanding area was constructed at the Y-junction between both Reservoir Roads.
Estynnwyd y cwlfer 750mm o ddiamedr, gosodwyd cefnfur a grid newydd, ac adeiladwyd llawr caled cysylltiedig wrth y gyffordd-Y rhwng y ddwy ffordd at y Gronfa.