Disston's engineers focused on Lake Okeechobee as well. As one colleague put it, "Okeechobee is the point to attack"; the canals were to be "equal or greater than the inflow from the Kissimmee valley, which is the source of all the evil."[18] Disston sponsored the digging of a canal 11 miles (18 km) long from Lake Okeechobee towards Miami, but it was abandoned when the rock proved denser than the engineers had expected. Though the canals lowered the groundwater, their capacity was inadequate for the wet season. A report that evaluated the failure of the project concluded: "The reduction of the waters is simply a question of sufficient capacity in the canals which may be dug for their relief".[19]