The first question was addressed by using the classical FAO paper 56 methodology based on the concept of crop
coefficient and evapotranspiration and by taking also into account the concepts of effective precipitation and
irrigation system efficiency. The estimation was done for two different scenarios related to the water application
with low and high efficient irrigation systems. Results show that in the overall the RGs have a water requirement
(GIWR) of 1,102,232 and 551,116 m3 for the scenario with low and high efficiency, respectively. The highest water
demand is registered for the RGs with horticulture (617,078 and 308,539 m3 for the scenario with low and high
efficiency, respectively).