Flooding due to the 19th July 1926 rainstorm, at the stone nullah, Wan Chai (灣仔), Hong Kong
University of Bristol - Historical Photographs of China reference number: NA16-097. Image from an album in The National Archives referenced as ‘HONG KONG 3. Views of Hong Kong from the 1860s to the 1920s' (CO 1069-446). According to the Hong Kong Observatory, the highest record of daily rainfall ever recorded in Hong Kong, is 534.1 millimetres - the 19th July 1926 rainstorm. See https://www.hko.gov.hk/en/blog/00000135.htm. The building in the background is probably the Wan Chai Pak Tai Temple (灣仔北帝廟), built in 1863.
Black and white photograph
The National Archives, London