According to wikipedia:

A waterfall chart is a form of data visualization that helps in understanding the cumulative effect of sequentially introduced positive or negative values.


Plenty of examples, starting with one from Tech Analytics:

SAF Business Analytics also shared a vdeo:

And Andy Kriebel completes the trio of sample videos:

Blog posts

Ryan Sleeper wrote a highly detailed blog post about this chart type:

The Information Lab shared this post on formatting Waterfall charts:

Nelson Davis wrote this post:

Tableau’s On Demand tutorials feature a Waterfall chart guide:

Example workbooks

An example of a standard Waterfall chart by Slywia Kolodziejska:!/vizhome/WaterfallChart_4/DashboardWaterfallChart

I have (vainly) added one of my own, as it was my first waterfall chart on Tableau as part of week 30 of #MakeoverMonday. It’s a reasonable use of the chart type, as it allows you to identify decades in which the Bermudan population grew relative to other decades:!/publish-confirm

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