All really good responses here.
One of the most interesting courses I took was holistic counseling in '97, which included some classes in dream interpretation. I can't tell you how fascinating it was to hear others' dreams or nightmares & find a viable solution... it brought great relief to all of us to have a simple explanation & was taught from a more psychological point of view, rather than metaphysical.
We were taught that dreams, if not literal, are comprised of metaphors, myths, archetypes & symbols. The best way to interpret for oneself is to write down as many details as soon as possible since we forget quickly, leave it alone for a day or 2 so one is not approaching it from an emotional POV, then return to it to further expand upon details within any of the 5 categories. (I'll explain further below.) Ensure that you write down everything you can recall... words, colors, objects, oddities, animals... things like getting a glass of water or walking down a hallway may seem insignificant at the time, but you recall it or it stands out for a reason, so record it.
They can also be simple & literal (the 1st thing to always view)... a dream of flubbing an interview could be a normal fear if one is in the process of interviewing. For example, you mentioned Katrina. The flood water could be simply a mother's concern for her son should there be
another flood.
Questions I'd ask with the first dream are:
1. Your son is falling... phrases which come to mind are falling from grace, falling in with the wrong crowd, falling away, falling back, taking the fall for someone, physically falling down, fallen woman. (These are all examples of things to ask yourself... I don't know you so fear not, I'm not making any judgments of any sort. These are q's we can all ask with any dream/nightmare.)
* With 'falling from grace', are you worried about his/your rejection of any religious/family/societal value & how he/you'll be perceived? For example, do you abhor swearing, smoking or another behavior, noticed/suspect he's begun to do that & worry about his fall from your family values or that you'll be judged for his fall?
* With 'falling in with the wrong crowd', is it because he's now 16, beginning to drive and/or becoming more independent, so your normal motherly worry is that this could be in his future? Or, that the independence is more him 'falling away' from motherly love & he won't need you anymore... hence the picture in your mind of his falling & your need to rescue him?
* With 'falling back', is there any habit or behavior which makes you feel or worry he's fallen backwards, such as with studies, eating poorly so falling back into bad diets he once had or not thinking ahead to his future for career, so you feel he's fallen back to being more childlike?
* With 'taking the fall', again, could he have a friend you don't trust & you feel he might be negatively influenced by him/her? Or, you've implied divorce, if I'm correct, so do you feel he feels guilty, or worry that he 'took the fall' in his own mind for the split?
* With 'physically falling down', did he just begin a sport or is now driving & it's a physical fear? Or, you fear if he does fall, you're worried about him 'picking himself up by his bootstraps'? (So, remembering a boot in a dream, for example, could seem insignificant, but might have meaning, if you see what I mean.)
* With 'fallen woman', you mentioned now that he's 16, you're ready to move on with your life. Is it a fear that he or someone else might view you in such a way due to religious views, for example? So, in essence, the dream might be more about you & your need to protect him or protect his view of you (when you catch him, he's 'looking up to' you.)
2. With the 2nd dream, phrases which come to mind are drowning sorrows, drowning in sorrow, keeping one's head above water... being bored (the board).
Questions I'd ask are:
* With 'drowning sorrows', is there any fear with him, you or family with too much drinking, or a past history of familial drinking which is what you worry about with him at his age, or that his independence might lead him to such behavior? It could have been something as simple as a car accident with partying teens you read about or schoolmates of his, so it's a normal motherly fear.
* With 'drowning in sorrow', is he depressed, lost a friend recently, not doing well in school/sports/activities/friends or did he just get a girlfriend & you fear a split at some point & a broken heart?
* With 'keeping one's head above water', are there worries about being spread too thin in schedule for you/him? Money woes & you worry about his future college education?
* With 'the board holding him down', are you worried that he's moody & bored & it may 'drown him' or 'kill him'?
Just a bit of food for thought. Hope this helps.
BTW, I've found that the dream books are too objective, therefore, not reliable because we all have different reactions to different words/symbols... dreams are far more subjective. For example, 2 people who dream of their mothers... 1 might love his/her mother & have a wonderful relationship with her so it's a comforting dream & the other might have the opposite relationship & mum brings feelings of dread/anger/fear. How could dreaming of mum be the same for each? A spider dream might scare the wits out of me because I'm afraid of them, for you, not so much.
Lastly, I agree with what others have said in that premonition is possible. So, if your son is helping grandpa build a staircase or fix the loose bannister next weekend, ensure extra safety, even if it means you are 'coincidentally' present to push dangerous wires to the side or move boxes someone might trip on. If he's going on an upcoming camping trip at a lake, make sure he's got his life vest & have the 'don't drink & drive, operate heavy machinery or swim' if you should go against my wishes & imbibe in any alcohol your friends might sneak into the tent.
Afterthought... any fears about feeling the need to save your son? Again, physically... he's wanting to drive a motorcycle & you wish he wouldn't, etc? As another said, it could simply be normal motherly love & concern about him becoming more independent. I just listed all the above because I love interpreting my own wacky or scary dreams... they're often far simpler than they initially seem.
Good luck!