1.1. SENARA: National Groundwater, Irrigation and Drainage Service (Servicio Nacional de Aguas Subterráneas, Riego y Avenamiento).
1.2. DISTRA: Arenal Irrigation District (Distrito de Riego Arenal).
1.3. CGR: Contraloría General de la República.
1.4. ARESEP: Autoridad Reguladora de los Servicios Públicos.
1.5. Irrigation District (Distrito de Riego): a physical, technical-administrative unit of an agricultural and livestock nature, in which the necessary works exist or are to be carried out, seeking maximum efficiency and effectiveness in the use of available water resources, seeking their comprehensive utility and guaranteeing their sustainability over time, in order to achieve the greatest agricultural, economic and social development of the agricultural production units involved.
1.6. User: any natural or legal person who owns a property that receives water within DISTRA, for use in the purposes stipulated by the SENARA Law.
1.7. Registry of Aquaculture Users (Registro de usuarios de piscicultura): the registry containing the information of users and properties that have water service for aquaculture.
1.8. Water Service for Aquaculture: the set of assets, activities and personnel that, subject to the authority of DISTRA, makes possible the delivery of water for use in aquaculture, in accordance with the policies approved for this purpose by the Board of Directors of SENARA.
1.9. Water Tariff for Aquaculture: the monetary compensation that the user must pay for the water service for aquaculture.
1.10. Irrigation Tariff: the monetary compensation approved by ARESEP that must be paid for the irrigation service.