Creating a stream? Following the natural flow of the running water, but making it more of a feature

[TheLightOfEarlyMorning]

Diagonally along the end of the garden, is a channel of water. It is essentially a natural stream, but not 🤔 The garden is also boggy there in areas. (We're on a hill, and it’s run off rain water.) I want to make more of a feature of it - maybe channel it to lessen the spread of the boggy areas, but a, worried about causing problems (erosion?)

Are there any good resources out there? Has anyone done this? I was thinking along the lines of those dry stone 'rivers' (in the dry summer) that become a channel for water when needed.

Where to start…?

The house we live in must have had a very boggy garden - there are land drains under the lawn which feed down into a deep ditch which has water in all but the very driest summers. Rather than erosion we find the ditch clogs and has to be cleared, however it does run through woodland so quite a lot of debris falls into it.
So for a start you could use land drains to dry out the boggy areas (they are basically perforated pipes bedded in gravel). Perhaps you could then contact a local nature reserve about creating an attractive stream? They might at least point out resources on the subject.

Some of the houses further up do have land drains - I think that's contributed to the problem in the houses further down. I wondered whether I could work with it too make it nicer (plus I'm not sure of the legalities of doing something that causes another homeowner a problem and I don't want to be the first to complain itswim). The gardens address very wide and mine is the last before big ditches at the side of fields.

I think they do this sort of things with Japanese gardens, where they make use of an existing water source to create a feature with boulders, moss, ferns and so on. Maybe that might be worth a go.