Vízügyi Közlemények, 1979 (61. évfolyam)
4. füzet - Mistéth Endre: Mezőgazdasági öntözőrendszer biztonsága
Mezőgazdasági öntözőrendszer 597 K ) 0 Ft/ha/év ő. ábra. Az öntözés fajlagos költségei (Kw), 1— = 0,80 kietégítettség esetén az öntözendő к terület ( То) nagyságának függvényében Fig. ő. Unit costs of irrigation (Kw) at a supply level 1 — — = 0.80, in terms of the magk nitude (To) of the area to be irrigated Figure 5. Frais spécifiques de l'irrigation (Kw) en cas de l'assouvissement de 1——= = 0,80, en fonction de l'importance de la superficie à irriguer (To) shortage is found, from which it is possible to estimate the magnitude of the area to which no water can be supplied and thus the losses in crop yield. On the basis of the foregoing, to each reservoir volume annual total costs can be assigned, the latter including also the crop losses. Instead of the annual total costs, the minimum of costs per unit area is only determined. It can be demonstrated that if the construction costs, the reservoirs to be filled annually and the water shortage vary in proportion with the area to be irrigated, then the optimal magnitude of the irrigation project is related to the losses per unit area. It can be demonstrated further that at minimum unit costs the unit crop yield is highest. The foregoing theoretical considerations are demonstrated in Section 6 by a numerical example related to the optimization of the irrigation projects in the Tisza Valley. * * *
