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Menu:   Processing > Morphology… > Geodesy->Waterfall  
Script:   waterfall  
Use this function to create basins of intensity in an image or selectoin. The function works by treating the image as a topographic surface, finding the local minima and using them as seed points for "flooding" the surface. You can also visualize this function as a heavy rainfall applied to the intensity surface, with a selected level of precipitation.

If you choose the this command, the following options will become available:

Displays the input image frame number. If you want to process another image, type or select the corresponding value.  

Displays the number of the frame in which the output image will be created. Depending on the Preferences. ImageWarp will set it either to the first available value or to the Input frame number. Type or select another value if you want the output image to be created in a different frame.  
Select this check box to watch the Preview of the output image.  
Lets you specify the maximum depth of "water basins" on the intensity surface. This could be also interpreted as the level of rain falling onto the surface. Increasing this parameter will result in merging of small basins into bigger ones.  
Select this option to inverts the input image before submitting it to the waterfall operator.