Tag Archive: bridge failure

Sep 13 2013

A Day in the Field During the Big Thompson Flood (Footage)


In case you haven’t seen the national news and don’t live in Colorado, we have been experiencing constant rain (until this afternoon) since Monday across the entire front range from Colorado Springs and south to Fort Collins and north. The rain just did not stop and the foothills in particular were just getting hit hard. …

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Jun 21 2013

Alberta Canada Flooding

Calgary and several other communities in southern Alberta are in the midst of some of the worst flooding in their history from heavy rains.  Some small streams have peaked, but with more rain coming some rivers may still rise.  The Water Office provides links to real-time stream gages throughout the region. Entire neighbourhoods all along …

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Aug 02 2012

Criteria for Selecting Hydraulic Models, Part 3


Continuing with our coverage of the new HDS 7 manual from FHWA. Part 1, Part 2 Bends, Confluences and Angle of Attack Highly sinuous rivers are, by definition, not one-dimensional, especially during floods when water in the floodplain flows more directly down valley and moves in and out of the channel. One-dimensional models must consider …

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Jul 24 2012

One-Dimensional Versus Two-Dimensional Modeling


Continuing with our coverage of the new HDS 7 manual from FHWA. One-dimensional modeling requires that variables (velocity, depth, etc.) change predominantly in one defined direction, x, along the channel. Because channels are rarely straight, the computational direction is along the channel centerline. Two-dimensional models compute the horizontal velocity components (Vx and Vy) or, alternatively, …

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