Hi -- I have never been to that reserve, but rainy season in the Amazon can mean significant flooding of lowlands, which is why many of the lodges (like Explornapo) are built on stilts! The Amazon itself rises ca. 40'. Areas that are higher relief like Tambopata may not get as much flooding. Most outfitters try to keep their trips to the non-rainy period. Cheers, Gail Mackiernan