The main goal of the initiative is to allocate to the environment at least 30% of the total water available in LAC to secure protection of the main freshwater ecosystems and free-flowing rivers, and the benefits that flow from them. Water Reserves are the science-based allocation policy instrument that secures hydrological requirements of ecosystems, through the estimation of environmental flows (e-flows). They have been first established in Mexico with the National Water Reserves Program leaded by WWF-Mexico and the National Water Commission (CONAGUA).