This 26-kilometre-long ditch that carries water to Manresa was built in the 14th century by the master Guillem Catà.
Its construction was highly problematic, as the Bishop of Vic opposed its construction because it passed through the bishopric's land and threatened its promoters with excommunication. The bishop died before the works were finished and even so he really excommunicated the workers and the councilors of Manresa, in addition to interrupting the practice of the sacraments throughout the city. The bishop's successor maintained a more dialogue attitude, accepting the compensation offered by the city.
However, legend has it that divine intervention became necessary, in the form of a mysterious light from Montserrat that entered through the stained glass windows of the Carmen church, at the same time that the bells began to ring by themselves. The bishop, seeing this phenomenon, regretted his position, but died shortly after, and his successor did not take long to reverse the situation and lift the excommunication.