good form of water storage but difficult to flow and is usually associated with another two in well records. Being in an urban environment is susceptible of contamination. Other cares refer to the karst relief in Furnas that can cause landslides. Arch of the Ponta Grossa This arch, named after the city, is located on a rise of the earth's crust on the eastern limit of the Paraná Basin. It arose about 130 million years ago when the South American and African continents were separating. It has an NW-SE direction with NW trim, diabase dikes appear in subparallel bundles near the arch and these same fractures are responsible for the third plateau basalt effluent. In the second plateau but mainly in horizontal fracturing. The topography is also a consequence of the arching, exposing the older rocks at the edges of the sedimentary basin. Several parallel faults, aquifers and magnetic alignments follow the direction of the Arch of the Ponta Grossa. It is believed that the resulting dikes were not formed simultaneously, but over a period of 100 years, and not necessarily all are situated to the northwest. The drainage of some rivers that pass through the city and in the region of Campos Gerais is accompanied by canyons, rocky walls and waterfalls as found in the municipality in the São Jorge River, which demonstrates a morfoestrutural control. Hydrography The main drainage basin that covers Ponta Grossa is the Tibagi River (original indigenous denotation "Tibaji"), tributary of the Paranapanema River in a hierarchy with the Paraná River. Tibagi covers 6.5% of the entire area of the municipality, its tributaries are the Pitangui River which in its margin is subdivided into: Verde, Cará-Cará and Botuquara known in the city. There are no major watercourses on the left bank. The municipality also has the source of the Ribeira River within the Campos Gerais Park in a depression with altitude much smaller than the urban area and it is found in the 1st Planalto (Plateau of Curitiba). The area is considered well irrigated even if it has relatively small basins outside the Tibagi River that covers the whole region. With the retention of moisture has its rapid displacement to the main water flows. Some of the region's rivers are affected by structural controls. Many times it accompanies faults, fractures and dikes in the direction of the Arch of Ponta Grossa (NW-SE). In addition the