 This in turn affected the "Emisor Central", which had been designed to be closed during the winter for maintenance.Because of the settlement of the grand canal the "Emisor Central" was continuously filled with water, making it impossible to inspect it for problems or to maintain it, making maintenance impossible between 1995 and 2008.The tunnel has been damaged by overwork and corrosion of its diameter walls  and its capacity has been reduced to 120 m3/s.