Managua that Managua will experience a severe earthquake every 50 years or less. Managua features four smaller crater lakes or lagoons within city limits. The most centrally located is the Tiscapa Lagoon in the Tiscapa Lagoon Natural Reserve. Managua, due to its tropical climate, varied topography, naturally fertile soils, and abundant rain and water sources, boasts a great variety of flora. Many different types of trees, some of which are not found elsewhere in the world, appear, including "chilamate"s, "ceibo"s, "pochote"s, "genízaro"s, "tigüilote"s, royal palms, "piñuela"s and "madroño"s (Nicaragua's national tree) surround the city. During the rainy season (May to November),
Managua and reconstruction programs were expanded. New governmental buildings, galleries, museums, apartment buildings, squares, promenades, monuments, boat tours on Lake Managua, restaurants, nighttime entertainment, and broad avenues have resurrected part of downtown Managua's former vitality. Commercial activity, however, remains low. Residential and commercial buildings have been constructed on the outskirts of the city, in the same locales that were once used as refuge camps for those who were homeless after the earthquake. These booming locales have been of concern to the government because of their close proximity to Lake Managua. The construction of a new sewer system and the redirecting of