Fig. 5. Activity diagram of the centralized model. Sequence of activities within 1 yr (t). EWA(t)= expected water availability in mo 7 of yr t, RWV(t)= requested water volume in mo 7 of yr t, Total IC = total costs of irrigating the total amount of fields, NAFR = Financial Reserve of the National Authority, cropneed = water needed to irrigate one field of the respective crop, and cropcost = cost of cultivating the crop on one field.