Public Service #4: A New Technique for Slaying the Bermudagrass Dragon.

Bermudagrass is a beast.   (Cynodon dactylon and friends) A warm-season (summer) sod-forming grass with incredibly aggressive and tough above- and below-ground rhzomes/stolons.  It's great if you want it, but hellish when you don't.
Removing it by hand form my veg garden has confirmed the lore that plenty of its rhizomes occur well below a foot underground.  It's a beast.

A search of the net and the library for ways to remove Bermudagrass provides a few options.  (1. Spray repeatedly. 2. Dig by hand for ages and ages, removing all living material.  (I've done this)  3. Fry it under plastic tarp for at least a year.  4.  Smother it with tightly pinned layers of weed fabric.

Well, none of these were going to work very well for my garden client, but we almost resigned on one... until a miracle revealed itself:

Whoah.  What?

This particular lawn of Bermudagrass mostly had rhizomes within the top two inches, like a normal sod-grass.  Wierd.  For the records, a few spots were indeed deeper.  But not much. We've already dug most of those out.  So, miracle of miracles, a rented sod cutter, set to two inches, did a bang up job of decapitating this Hydra.  I want to type the word again: Miracle.   What profound Providence.
Now we are moving on with the dryland/native/unwatered garden.

The summation:
Technique #5 for Bermudagrass removal:  Don't assume that your patch of Bermudagrass has its roots wrapped around the subway system in Shanghai: Actually check if the rhizomes are as deep as feared.

I'm humbled, again, to an old adage:    Assume nothing.