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Concerns were first raised in 1986 after the dams - built by a Yugoslavian construction company in the 1970s - suffered major damage after a severe storm.
Protesters changing "Libya! Libya!" called on authorities to expedite their investigation into the disaster, for the UN to set up an office in Derna, for the urgent reconstruction of the city and for compensation for those affected by the flood.
Residents from the nearby cities of Benghazi and Tobruk have offered to put up the displaced, while volunteers search for survivors buried beneath the rubble.
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Some 3,200 bodies buried so far, many in mass graves outside the devastated city of Derna, with others moved to nearby towns and cities
Officials have warned that a disease outbreak in Libya's northeast, where floods have killed thousands, could create "a second devastating crisis" as diarrhea spread among those who drank contaminated water.