to some investigations, an exceptional discharge occurred on March 29, 1925, estimated at 600 m³/s.

The decrease in the flow of the Rímac during the dry season, in addition to the constant growth of Lima, prevented a good supply of drinking water in the city. For this reason, in 1962 the Peruvian government carried out the water transfer project from the Marcapomacocha lagoon, which belongs to the