My back yard has some wet spots near the corner of my house. Because of property lines, fences, and window wells for my basement, it's hard to dramatically change the surface drainage of the area. I'm considering putting in a plastic drain box and perforated pipe that will tie into the storm sewer system.

What things should I be careful of when doing this? Should I consider just doing a French drain which does not tie into the storm sewer? Should I dig a trench, line with small rock, then lay in the corrugated, perforated pipe?

I'd really hate to do all the work of burying the pipe only to discover I didn't do it right.