Dreaming of falling into the sewer, disaster came.
It would be a disaster to dream of falling into a stinking ditch or puddle.
Dream of difficulties, life will be full of confidence and courage.
Based on the above Duke Zhou, you can analyze the difficulties or disasters you will encounter in your life (the size of the disaster depends on what ditch you fall into)
But you have the courage to get out of this ditch.
So the inference is that you will be lucky.