It is impossible to solve urban flooding issues by simply expanding and building huge drainage pipes, a senior ministry official said on Friday.

Lu Kehua, deputy head of the Ministry of Housing and Urban-Rural Development, said the government is pushing forward the "Sponge City" program, a comprehensive system similar to the natural ecosystem, to absorb the rainfall.

"There are many reasons behind urban flooding, and a poorly designed and maintained drainage system is only part of it," said Lu. "By promoting 'Sponge City', the rainfall would penetrate into the ground first, and we can collect the rainfall through lakes, rivers and tanks underground, working like a sponge."