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According to my understanding, the Multiple Flow Direction (MFD) algorithm was originally defined in The Prediction of Hillslope Flow Paths for Distributed Hydrological Modelling using Digital Terrain Models by Quinn et al. 1991. Since then it seems to have been renamed to FD8 to prevent confusion and I believe some may even refer to it as MD8 but I have failed to discover when this happened. This originally caused some confusion on a project I am working on.

I am looking for a reference or an explanation for when MFD became known as FD8 and if MD8 is also a valid name for the algorithm or am I mixing algorithms altogether?

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In Wilson et al. 2008 (http://spatial.usc.edu/wp-content/uploads/Water-in-the-Landscape.pdf)

"The FD8 multiple flow direction (MFD) algorithm developed by Quinn et al. (1991) directs water to every adjacent downslope cell on a slope- weighted basis." p. 217.

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    That's from 2008. Terrain Analysis: Principles and Applications edited by Wilson & Gallant and released on 15 January 2000, also uses FD8 instead of MFD.
    – Steinin
    Nov 14 '13 at 7:56

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