Fig. 6. Activity diagram of the decentralized 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, DWV(t) = delivered water volume in mo 7 of yr t, Y(t) = yield in yr t, IC = costs of irrigating the total number of fields, FR = financial reserve, cropneed = water needed to irrigate one field of the respective crop, and cropcost = cost of cultivating the crop on one field.