Kunming, capital of southwest China's Yunnan Province, has been receiving its biggest rainfall of the year since Thursday, forcing the city to grapple with urban flooding.

Precipitation has reached up to 190 mm thus far and rain-triggered floods have seriously disrupted road traffic, said Jiang Kaili, deputy director of the municipal flood control office.

Cars and taxis have become submerged and more than 200 inundated buses have been rendered unusable. [Photo/Xinhua]

Cars and taxis have become submerged and more than 200 inundated buses have been rendered unusable.

Jiang said the city's drainage system has failed, resulting in floods in many areas in the city proper. Water levels on the nearby Panlong River exceeded the height of a river bank near Shilichangjie Street on Friday, according to the city's drainage company.

Other rivers that traverse the city, such as the Jinzhen and Daguan rivers, have also seen drastic increases in water levels.

A spokesman with the Kunming railway bureau said trains departing from Kunming were operating as usual as of Friday noon, but those destined to arrive in the city from the cities of Shanghai, Xiamen, Nanjing, Guilin and Qujing have been delayed.

Meanwhile, 2,000 air passengers were affected as they couldn't get to the city's airport on time because of failed transport. Twenty-four flights were delayed.

The rainstorms also cut off power to 12,700 homes in 16 neighborhoods. By 6 p.m., power has been restored in five neighborhoods and workers were trying to resume electricity to four others.

But for the rest seven, workers have no choice but wait until flood water recedes for repairs.

The city government on Friday initiated an emergency response for flood control. More than 3,000 people have joined in disaster relief efforts, helping relocate 26,000 residents to safety.

The rain is continuing to batter the city. According to a provincial weather forecast, it will continue until July 25.

Heavy rain has also hit the province's cities of Lijiang and Qujing, as well as Honghe Hani Autonomous Prefecture.