Iran has accused Israel of several attacks on facilities linked to its nuclear programme and killing its nuclear scientists over the past years. Israel has neither denied nor confirmed the allegations.
The deaths recorded in the past 24 hours brought to 6,091 the overall toll from the illness in the Middle East's hardest-hit country.
Abbas Ali Kadkhodaei, spokesman for the Guardian Council, which vets legislation passed by parliament for compliance with the constitution, says the body has approved the measure.
Iranian authorities are looking to attract around two million new visitors as the country hit by US sanctions moves to find new sources of revenue.
At least 70 people have been killed and about 1,900 cities and villages have been affected by floods after exceptionally heavy rains since March 19.
Amid ongoing tensions with the US, Moscow and Tehran are embarking on naval cooperation in the Caspian Sea, where huge oil and gas resources reside.
Britain, France and Germany along with Russia and China say they remain committed to the 2015 Iran nuclear accord and to building up trade and investment links with Tehran.
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