Application of WinSRFR3.1 Model in Furrow Irrigation Simulation

Surface irrigation، due to its simplicity، is regarded as the most common method of irrigation. Advancing velocity of water in soil is one of criteria for surface irrigation management and especially cutoff time determination. Infiltration function is very significant in surface irrigation management. In the present study، the model WinSRFR3. 1 was utilized to study، evaluate، and design furrow frrigation. To achieve the aims of the present study، a series of field experiments، using furrow irrigation، were carried out in three experimental farms، namely، Golmakan in Mashhad، Toutoun in Urumiyeh، and Safi Abad in Dezfoul in summer 1998. It is noteworthy that the aforementioned experiments had various soil textures. The comparison of data obtained from field and those from WinSRFR model indicated that WinSRFR has simulated advanced and recession time، infiltration opportunity and depth، and volumetric balance fairly accurately in small to pretty long furrow. According to the finding of the present research، the maximum mean error for WinSRFR model was related to runoff estimation (6. 2 %)، and its minimum to total water input (3. 32%).