Is this big enough?

[Hazelbunny]

I got the diff between coop and run.
But I question the size of the dog house....especially in your climate.
Are your silkies bantams or the larger version?
The flooding is definitely a concern, as is the 'parents paying' aspect.

My silkies are bantams. 8 didn't even know the come in bigger sizes!

 

[1TurkenLover]

Healthy Space for total chickens:
Calculate Total Sq Ft,: IF I remember correctly, Length X Width = Total divided by ( what ) for Banty & Standard Size