![]() Let’s say the discharge is 12 cms, Manning’s n value is 0.014, the width is 4 meters and the slope is 0.001 m/m. A little trial and error with Manning’s equation and you have it: In a rectangular flume, calculating normal depth is rather simple. In fact, you shouldn’t do this as you’ll get the wrong answer. The workaround for the older software was to define the tops of the flume to be 0.01 ft or meters just outside of the bottom edge of the flume, like this: A perfect example of this is a rectangular flume. ![]() In other words, you could not have two or more elevations at the same stationing. Many water surface profile software programs prior to HEC-RAS had a quirky rule against having perfect vertical sides. Written by Chris Goodell | August 19, 2014 Vertical Walls-What are the Implications?
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