Oil billionaire brothers 'partly responsible' for Hurricane Katrina flooding then took advantage of the crisis to 'better their bottom line', claims new report Oil billionaire brother Koch brothers contributed to the flooding after Hurricane Katrina then tried to use it to 'better their bottom line', a new report has claimed. The report , by Bridge Project, is part of a lawsuit claiming the Koch Pipeline Company are 'partly responsible for the destruction of 1 million acres of marshlands and also for millions more acres of dying marshland'.