Iran's president has issued a stark warning about an unprecedented water and energy crisis threatening the capital, Tehran. Reservoirs have dropped to their lowest levels in six decades, with some dams holding less than ten percent of their capacity. The city is experiencing its sixth year of drought, and officials say that if rain does not arrive by late November, water rationing and even evacuation of Tehran may become necessary. The situation has been described as 'extremely critical' by both the president and energy officials.