Tag: National Highway Institute

Inspectors Make Sure Gorgeous Bridges Are Safe Bridges

By Rick Maslyn, CBI MSN.com recently compiled a listing of “Gorgeous Photos of Bridges in Every State.” The photos range from suspension and cable-stayed bridges crossing major water bodies to pedestrian bridges in parks. What unites these and most of the approximately 600,000 structures in the United States is that they are safe because they… Read More »

HEC-RAS Software: How Math Mitigates Flooding

In this City of Loveland, Colorado, map, the red line shows the HEC-RAS modeled 100-year floodplain that Ayres Associates completed in 2005. The yellow line shows the extents of the 2013 major flood, as measured by the City of Loveland. By John Hunt, Senior Hydraulic Engineer When it comes to 1-dimensional open-channel hydraulic analysis, the… Read More »

What Is Bridge Scour? Why Should You Care?

Scour shown in rock at a bridge in southeastern Utah. The most common cause of bridge failures is from floods scouring bed material surrounding bridge foundations. What is scour? Simply put, scour is the engineering term for the erosion of soil surrounding a bridge foundation (piers and abutments). Bridge scour occurs when fast-moving water around… Read More »