Distribution effects of water on production and incomes of farmers in system 'C' of the Mahaweli Development Project in Sri Lanka

agriculteur agricultores agua de riego canal canales canals climatic factors conduite de la culture crop management crops cultivos development projects eau d'irrigation facteur climatique farm income farm results farmers irrigation irrigation systems irrigation water manejo del cultivo plant production plante de culture proyectos de desarrollo revenu de l'exploitation riego sistemas de riego sri lanka