I like the “scoop” idea - that would also work (probably) to gather water from seeps on rockfaces and such. I’ll have to take a look at that, and give it a try.

Seems like it might also be a good ‘bowl’ for rinsing out socks and such.

As far as depth, I’m lucky in that, in my area, the streams are mostly gravel and sand bottoms, so I can use my trowel to dig a three-inch hole in that one-inch stream.