I'm hoping you guys can give me a few ideas for this patio. It's about 3 years old, and it's now very wavy. It's hard to say if the waviness is due to improper installation (I'm sure that's part of it), or collected water under the pavers, seeing that the h20 has nowhere to go. Homeowner states that water doesn't pool up, and does indeed drain. Not particularly surprising seeing that there are several large gaps, and it's a course sand in between and below the pavers. I don't know if it's a gravel base or not. The customer would like to regrade the base so the pavers can be reset properly. I'm a little concerned that something should be done with the water though, to avoid any future problems. I have a few ideas for drainage, but I don't know if they're any good. Does anybody have real life experience with this sort of situation, or any real suggestions that would work? BTW, I need to shoot the grade, but I believe the top surface of the patio is about 1'-1.5' above normal water level. Last fall when we had a lot of rain, the patio was probably below the water line. Also, the patio is pitched from the sliders to the timber steps.