First things first... Yaeeeeeey!! New chapter!
That out of thw ay... Few corrections I spotted.
Everybody has a tendency of writing "blanched", when it should be "blanked".
When Gobo saw Doc hurt... "pivotial" should be "pivotal" instead.
When Gobo and Red are running through the pipes... "mayriad" should be "myriad" instead.
Now that that's out of the way...
This is such a powerful chapter Sara. Doc's seen lounging at the beginning, in stark contrast to the end of the chapter.
Funny how the plumber's upset with Doc tinkering with the pipes again. And yet, you've captured something seldom seen from the show that would fit in quite perfectly if it had ever been done on the show itself.
Gobo and Red watching the scene... You get a sense that there's a connection between Gobo and Doc when the Fraggle's concerned about the silly creatures, especially calling/thinking of Doc as the provider of their water.
Finally... Hu boy! Action galore trying to outrun/outsurf/outswim the rapid currents of the water threatening to flood the Rock.
Oh Gobo... Hurry and rescue Red, I'm so afraid and worried about the two of them.