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John Yagecic put out a great little blog post with accompanying app this week. He looked at the uncertainty from using vague parameters in Manningâ€™s equation to estimate river flow. He made the great step of making the source code available. I forked this to the Open Hydrology repository and converted the project to metric units! Amazing! This is one of the big reasons I love open source: we can achieve so much more working together.

Thereâ€™s one feature Iâ€™m really keen to add, which is adding a toggle to switch between depth and flow as an input (and getting the other as output). Having flow as an output is really useful if youâ€™re trying to estimate flow, generally what a hydrologist does. However, if youâ€™re a hydraulic engineer you have flow and want to estimate a level!

This is the first post in a new series, where Iâ€™ll look at communicating uncertainty in hydrological methods. If youâ€™ve any suggestions for problems I should cover, put them in the comments below.

For those interested, the app was created using Shiny in the R language, which is a really nifty way to make interactive dashboards to investigate data and make decisions.

Investigating the impact of uncertain parameters on the Manningâ€™s equation.

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