The El Salvador country office of the Food and Agriculture Organization of the United Nations (FAO), with the support of the Mesoamerica Hunger Free Program, helped to develop community and family Rainwater Harvesting Systems (SCALL in Spanish) to mitigate the effects of the drought facing the central american dry corridor. The low cost and relatively simple technical aspect of the initiative helps to ensure access to water, thus improving the food and nutritional security of the participating families. In addition, it represents an excellent example for scaling-up, based on its proven technical parameters and especially the valuable lessons learned related to empowerment and social participation, multilevel and multisectoral consultation, and the exchange of knowledge between countries. These processes, which support the success of the initiative, help to ensure its sustainability and replicability. For example, similar projects have already been developed by El Salvador’s Ministry of Agriculture and are being planned as part of the Green Climate Fund’s RECLIMA project.