This report is based on a brief trip to Costa Rica by J.E. Christiansen and Rex F. Nielson to provide technical assistance in the planning of an irrigation and drainage system for the Taboga Experimental Station in the Province of Guanacaste. A three-day visit was made to the area, and shorter visits were made to the Experimental Station at Alajuela in the Itiquis Irrigation Project near San Jose, and to the IICA Research Center at Turrialba. The report discusses briefly the climate, soils and crops of the area together with water supply requirements and availability. A plan for an Irrigation System is presented together with a discussion of many problems pertaining to irrigation. The drainage problem is discussed. Specifications for equipment needed to construct the system and implement irrigation are included.