posted 13 years ago
I understand what you are saying. We live in the land of 3,000 mm of water a year, that would be 3 meters, or if you prefer, nearly 10 feet! (Tropical Rain forest, you just think you are wet).
Good soil drains, as well as preserves water. Swales are still a good idea, in my opinion, because they prevent runoff which may well be the larger problem for you, washing away of your nutrients. In fact, I would be positioning things so that fertility stays in your system for as long as possible, so making sure drainage from one area passes through another, and you work on the fertility of the upper areas.
On thing I do, a lot, is to place logs against the incline in the plantations. This increases growth of the trees, by forcing the water into the soil, instead of just running across the top. You would be surprised how fast ground can dry out in the tropics.
Here, we say we have two seasons, mud and dust. Mud for 8 months, dust for 2, and 2 months of transition, where you wonder how to build an ark...
Sustainable Plantations and Agroforestry in Costa Rica