 Generally construction work proceeded smoothly and from an engineering point of view there were few setbacks . However , one did occur in the early stages of construction . In March 1934 there was a violent storm bringing 130 mm ( 5 @.@ 12 in ) of rain in less than two days . As a result , the river rose rapidly which flooded the dam foundation workings . <unk> had to be installed and work resumed three days later . 
