DUBAI (Reuters) - A Saudi court has jailed 21 people, including at least one government official, after houses were built on flood-prone land, leading to more than 100 deaths by drowning, local media reported on Thursday. The rulings came nearly a year after two men were jailed in one of the first convictions in a graft crackdown the government launched following the floods that hit Jeddah in 2009 and 2011. Arab News daily reported that a senior municipal official was sentenced to five years in prison and fined 700,000 riyals (124,070 pounds) for giving permission for people to buy and build houses in areas hit by the floods. Houses were built on low-lying land and the situation was made worse by the absence of a city-wide drainage system.