The San Diego County Water Authority celebrated Tuesday its award for the world’s top civil-engineering project — a network of dams, pumps and pipelines that can protect the region’s water supply for six months. The $1.5 billion Emergency & Carryover Storage Project received the 2017 award from the American Society of Civil Engineers earlier this year, beating out the iconic new One World Trade Center in New York and the Chhatrapati Shivaji International Airport Terminal 2 in Mumbai, India, among other projects. On Tuesday a plaque was officially unveiled at the remote Olivenhain Dam, one of the four key parts of the project.