A major piece of legislation funding the development and improvement of water-related infrastructure passed Congress last week for the first time in nearly a decade, and President Barack Obama is expected to sign the bill soon. Yet public interest groups warn that a key provision in the law would complicate public investment in drinking water and wastewater systems in big cities and small towns alike. …. The broader law, agreed upon by large majorities in both the House and Senate over the past week following a year of negotiation, is known as the Water Resources Reform and Development Act. The full bill authorizes funding for a spectrum of new water infrastructure projects — particularly around ports and waterways, including flood protection and restoration — worth some $12.3 billion, though this money will still have to go through an appropriations process.