What is "poulaphouca"

Poulaphouca, officially Pollaphuca , is the name of a waterfall and bridge on the River Liffey between County Wicklow and County Kildare. It is primarily known for its hydroelectric generating station and artificial lake, known as Poulaphouca Reservoir, Poulaphouca Lake, or Blessington Lake. The once famous Poulaphouca Waterfall has little water running over it any longer because of the hydroelectric project.