Some success, I think.

This is a return to my original method.  I rendered a 16 bit tga from the
original function, then made a render another 16 bit tga from a render where
the terrain was flat white and my water cones were black.

In a separate file, I subtract the second function from the first to create this
hf, here with a resolution of 2000x2000.  I achieved better results when I
blurred the water function a little.

It doesn't do any global erosion, but I think it does a nice job of making
gullies and rivers.  I could place a second hf without the erosion just
slightly below the first to fill in the rivulets with some kind of water
texture.

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