Puerto Rico has a tropical climate with high precipitation rates, intense storms, and frequent floods. The island has several major surface flows, including the Rio Grande de Loiza, Rio de La Plata, and Rio de La Seda. There are several dams and reservoirs to control water flow, with Carraizo and La Plata being the largest. The island's hydrology is influenced by the topography, bedrock, soil, and vegetation. The watershed management plan is based on the need to reduce flooding and erosion, improve water quality, and conserve natural resources. The snowpack has no correlation with hydrology in Puerto Rico due to its tropical location. The island is prone to flash floods and landslides, which are worsened by deforestation, urbanization, and climate change.