Huggybear might come in disguise but yes she has changed her name 
I have some ideas about your dream but first want to say that the way I look at and interpret dreams is that they are thought processes with powerful intent. We don't often ge a chance to visulise during the day and feelings we have come out at night. I notice that my dreams manifest in both te day and night if you can be open and aware. With that in mind it is important for peace and hapiness in yourself and others if you are mindful of what you are thinking in the day and night.
The thoughts/dreams you have are doors or options you can have, cravings, fears and choices. How much you act upon them is part of the magic and makings of life.
I am no expert at the meanings of various symbols of dreaming yet. Rather I see patterns. Huggybear might be able to help more with indications and symbols in dreams.. or look in the site that MegandSoph gave you :)
I see in your dream that you had another option and path in life. An important one to you that you did not take. You still hold residue energy for this pathway, either emotions for the person or the situations and kind of life it would have brought you.
The policeman seems like a spiritual figure (God) or spiritual law that is trying to guide you and give safe passage in your indecision.
The flood and your fathers drinking to me seem somewhat combined in that they are adversity and a situation uncontrollable. The knock your pride and confidence.Your uncle like the policeman is there to help you.
It is good you have helpers and they tend to come when you are having trouble dealing with things yourself.
The end of the dream seems to relate to me to the ex-boyfriend. It is another life where the grass always looks greener.
hth