Water management under small village tanks [Sri Lanka]

abastecimiento de agua agricultura de regadio agua agua de riego agua dulce alimentation en eau almacenamiento de agua arroz arroz irrigado asia asie cereales cereals cropping systems crops cultivos cultivos de grano eau eau d'irrigation eau douce economic plants embalses engineering freshwater grain crops hydraulic engineering hydraulic structures irrigated farming irrigated rice irrigation water methode methods ouvrage hydraulique plantas plante plante de culture plants rice riz sistemas de cultivo stockage d'eau water water reservoirs water storage water supply