"Strikes carried out by Israeli foes were aimed at the Lebanese infrastructure. Their goal is to punish Lebanese farmers by cutting their access to water used for irrigation because militant groups used their gardens as launch pads," Sami Alawiya said.
Alawiya said the damaged canal carries waters of the vitally important Litani River to more than 1,200 acres of farmland. The strike hit the location of an ancient Roman aqueduct listed as a historical monument by the United Nations.
"The canal's bombing threatens food security... and runs counter to UN conventions," Alawiya added.
Israeli said it hit infrastructure of the Palestinian militant group Hamas in southern Lebanon in response to a barrage of rocket strikes launched against its northern territory on Thursday.
Tensions escalated on Wednesday after Israeli security forces stormed the Al-Aqsa mosque in Jerusalem, one of the holiest Muslim sites, arresting hundreds of worshippers. The raid drew protests from the Arab world.
The fighting comes amid the holy Muslim month of Ramadan, which coincided this year with the Jewish holiday of Passover. Israeli military chief Hertzi Halevi said Friday that Israel would continue to use force "as much as necessary, against any enemy and in any arena, both during the holidays and during times of internal public debate."