Stream to river transition

As part of the disaster preparedness mapping of the Nevado del Ruiz volcano, we are mapping many waterways from the source to the end. Most are streams (quebradas), and some rivers (ríos). However, they all begin very small (streams), and after merging with other streams, some become rivers.

Our doubt (@afgb1977 and me) is for the waterway and naming tagging. Let’s draw the stream with a dash and the river with an equal sign.

A) Should we change the waterway’s name (Gualí) according to its type?

--------------------====================>
    |                       |
    |                       |
  waterway="stream"         |
  name="Quebrada Gualí"     |
                            |
                            |
                          waterway="river"
                          name="Río Gualí"

b) Or should we call the whole course by its name? Even if the name does not match the type of waterway, at the beginning.

--------------------====================>
    |                       |
    |                       |
  waterway="stream"         |
  name="Río Gualí"          |
                            |
                            |
                          waterway="river"
                          name="Río Gualí"

c) I put the last option, but we think this is inappropriate, where the whole waterway has its file type and name, even if it does not match at all initially.

--------------------====================>
    |                       |
    |                       |
  waterway="river"          |
  name="Río Gualí"          |
                            |
                            |
                          waterway="river"
                          name="Río Gualí"

What should be the appropriate tagging for streams and rivers? I’ll appreciate your thoughts.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/stream-to-river-transition/97832