These are videos from the most recent flooding to occur in Jeddah just today. In November 2009, there was also severe flooding, and the number of casualties was widely believed to be greatly under-reported.
Widespread corruption is to blame. Contracts were not fulfilled, monies were absconded by unscrupulous businessmen, and the people are left to suffer every time it rains in the city of Jeddah.
Luckily I am not in Jeddah right now.