In the Yucatan peninsula there are no currents of water surface because the soil is composed mainly of limestone high permeability, which causes much of the storm water to infiltrate the underground through a system of cracks, fractures, cavities and caves that can sometimes get to crashes on their roofs, causing the formation of cenotes.

Through this system groundwater touring the state since the middle of the peninsula where the main loading areas until you find on the coasts, and may even exits freshwater in the open sea. Little is known of the aquifer, but we know that there is a layer of fresh water throughout the peninsula and below this there is a layer of salt water and farthest from the coast, the layer of freshwater is greater than the salt water (Meacham, 2006). However, the volume of fresh and salt water, and discharges, depend on several factors, the first instance, we can say that more rain largest amount of fresh water out of the outlets, but due to the effect of low atmospheric pressure and storm surges that accompany the precipitation, sea water level rises, causing a greater inflow of salt water to the aquifer which blocks the outflow of fresh water until the weather conditions become normal, and it is at that moment when the outlets water will be fully visible due to the amount of water we are releasing (Beddows, 2004).