>> My biggest problem this year was the rain. It was a solid 3 months.
That part sounds normal to me. We have a mountain named "Rainier". They CLAIM that's a person's name, but I think it's just Truth In Advertising: the coastal PNW IS more rainy than most areas. Much of the year, we have drizzle more often than not.
>> They are about 4 feet deep. Needless to say they were overflowing more often than not.
Yikes! Glug glug glug. I guess you tie plant labels to branches and a cork, so they float.
>> Then, what the rain didn't kill or run off, the slugs had a field day.
It couldn't just DROWN the slugs ... no, that would make gardeners' lives too easy.
I might have an all-male species of slugs - they really love beer and will drown themselves in it given a chance. They sound like guys to me! (Except for the part where they eat salad willingly.)