Located between the Andes Mountains and the southwestern coastline of Peru, the irrigation district of La Joya Antigua has a typical sub-tropical desert climate with very little annual precipitation. Study on this irrigation district shows sufficient irrigation water on most of the farms in a wet year but a deficit of irrigation water in a dry year. In order to cope with water shortage, strategies such as focusing on irrigating certain crops, reducing the irrigation area, changing crops to less water demand crops, etc are applied by the local farmers. The farmers' strategies have been proved to be a very effective way of reducing the crop water demand in the irrigation district of La Joya Antigua.