Spatial and Temporal Variation of Distributed Water in Irrigation Network of Doroodzan Dam

One of the principal methods to improve water productivity in irrigation network is to use the suitable distribution of water. In this research، the distribution of water in Doroodzan dam irrigation network was evaluated using 14 years of data (1996-2010). This irrigation network is located in northwest of Fars province and distributes stored water in Droodzan dam. Distribution of water between Hamoon، Ordibehesht، Left side Principal and Abarj canals was studied. Monthly distribution of water showed that in April and May، inflow in canals are high، in November they are low and in February there is no water in canals. The index of delivered water per unit area of land must be equal between canals. The lowest amount of this index was 0. 19 (l. s-1. ha-1) for Hamoon canal and the highest amount was 0. 37 (l. s-1. ha-1) for Abraj canal. The results showed that Hamon canal compared to others received less water per unit area and Abarj canal، received the highest amount of water per unit area. It was recommended that the water must be distributed between canals by equal amounts per unit area on volumetric basis based on crop water requirements.