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The 2020 Karachi floods (Urdu: سيلاب کراچی ) were the worst flooding Karachi had seen in almost a century, and killed at least 41 people. [1] [2] [3] The floods were caused by record monsoon rains from 24 to 27 August, [4] which were inadequately drained by poorly maintained drainage systems in the city.
Lai Nullah (Urdu: نالہ لئی), commonly called Nullah Lai, is a rain water fed natural stream flowing through the city of Rawalpindi. Every monsoon season the stream floods after being fed by its catchment basin in the Margalla Hills bordering Islamabad, Pakistan.
The average annual rainfall for Karachi is 309.6 millimetres (12.19 in) (1981–2022); the highest annual rainfall of 869 millimetres (34.2 in) was recorded in 1967. [5] The highest rainfall in a single day was recorded on 27 August 2020 when rainfall of 223.5 millimetres (8.80 in) lashed the financial hub of Pk.
In 2003, Sindh province was badly affected when above normal monsoon rainfall caused flooding in the province; urban flooding also hit Karachi where two days of rainfall of 284.5 millimetres (11.20 in) created havoc in the city, while Thatta District was the worst hit where 404 millimetres (15.9 in) rainfall caused flash floods in the district ...
The rise in sea surface temperatures is believed to increase monsoon rainfall. [12] [11] In addition, southern Pakistan experienced back-to-back heat waves in May and June, which were record-setting and themselves made more likely by climate change. [13] [14] These created a strong thermal low that brought heavier rains than usual.
The highest rainfall to be recorded was in Jacobabad, with a record 481 millimetres (18.9 in) in just 7 days, and 441 millimetres (17.4 in) in just 36 hours. In Larkana, 239 millimetres (9.4 in) of rainfall was recorded; 206 millimetres (8.1 in) of rainfall was recorded in Sukkur. Larkana was the worst affected by heavy rainfall.
The remainder of the year has significantly less rain, amounting to about fifty millimeters per month. Hailstorms are common in the spring. Pakistan's largest city, Karachi, which is also the country's industrial center, is more humid than Islamabad but gets less rain, but still possesses a tropical climate.
Floodwaters and rain destroyed 700,000 acres (3,000 km 2) of cotton, 200,000 acres (800 km 2) acres each of rice and cane, 500,000 tonnes of wheat and 300,000 acres (1,000 km 2) of animal fodder. [ 40 ] [ 41 ] According to the Pakistan Cotton Ginners Association, the floods destroyed 2 million bales of cotton, which increased futures prices.