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 its members. Chief of Police, Aminta Granera, stated that vehicles robberies has reduced; as only 200 reports were filed in 2006. The German government funded the construction of a water treatment plant with plans to process the city's sewage and clean the Managua lake. Also pending is a mega-project to reconstruct the old center of Managua, and to introduce a monorail system, to alleviate future transportation problems in Managua. Managua is the home of most national broadcasting television channels as well as the major national newspapers. Some of the larger television channels include: Canal 2, Telenica, Canal 10, Canal 15