Ali. Mehmandoostkotlar - MSc student in civil engineering, Daneshgah St., Shahid Nikbakht Engineering Faculty, Department of Civil Engineering, Graduate student office, Zahedan, Iran,
Mehdi. Azhdary Moghadam - Associate professor, Department of Civil Engineering, Sistan and Baluchestan University, Zahedan, Iran
Mohammad Mahdi Houshmand - MSc student in civil engineering, Daneshgah St., Shahid Nikbakht Engineering Faculty, Department of Civil Engineering, Graduate student office, Zahedan, Iran
Farid Miar Naeimi - MSc student in civil engineering, Daneshgah St., Shahid Nikbakht Engineering Faculty, Department of Civil Engineering, Graduate student office, Zahedan, Iran

Local scouring means removing bed rivers that is caused by changing the flow pattern due to the existence of hydraulic structures. The downstream of transverse structures (such as check dams, rock chutes and block ramps) are usually located in stilling basins that are menaced by scouring. Block ramps are restoration structures whose ramps are armored by blocks to rehabilitate bed rivers. River environment issues particularly fish passing can be preserved using block ramps. Moreover large amounts of energy are dissipated due to block ramps head difference. Therefore block ramps have been used rather drops and sills recently. In addition the hydraulic jump which takes place in the downstream of block ramps can be an increasable factor of scour depth. In this study mean scouring depth in stilling basin downstream of block ramps using ANN and ANFIS are investigated. Consequently the soft computational methods are compared with experimental and statistical methods which were carried out by Pagliara and Palermo. High correlation coefficient and the small amount of error evaluation criteria show better agreement of ANN and ANFIS methods.

Block ramp, Downstream, Scour Depth, ANN, ANFIS