In his 1974 film “Chinatown” about the battle for water rights in Los Angeles, Roman Polanski offered a film noir look at corruption and malfeasance. His grim tale was inspired by the real-life California water wars where that precious natural resource was diverted from rural lands to booming L.A. through the machinations of politicians and businessmen. But “Chinatown” is just one version of how the fight to control water has imprinted California’s history according to a new exhibition at the Booth Western Art Museum in Cartersville.