More than 61 percent of San Francisco voters approved Proposition B, a charter amendment to split the Department of Public Works in two and add oversight commissions to both departments as part of an effort to address city corruption and get cleaner streets. Matt Haney, District 6 supervisor and author of the measure, said the new department doesn’t need to be created until 2022, but city legislators can get to work now on building the oversight commission for the existing Department of Public Works.