Drainage & Flood Control

SEMA designs and builds reliable drainage and flood control systems that help protect communities from rising water and extreme weather. From large-scale conveyance systems to tunnels, levees, and spillways, we construct solutions that keep water moving safely and efficiently. Our expertise includes working with a variety of pipe sizes and materials, as well as fabricating gasketed precast box culverts and other specialty components through SEMA Precast. Whether it’s storm drainage structures, vaults, or intakes, we deliver durable, high-quality infrastructure built to withstand the elements.