Influence of Using Floor Jets on the Local Scour Downstream Fayoum Type Weir


  • Gamal Elsaeed
  • Abdelazim M. Ali
  • Alaa Nabil El-Hazek
  • Ahmed Mahmoud Ibraheem



Floor Jets, Scour, Silting, Stilling Basin, Weirs.


Local scour downstream hydraulic structures may cause damage or complete failure of these structures. In this paper, an experimental study was carried out to investigate using floor water jets as a mitigation measure to minimize the local scour downstream stilling basin and to clarify the best arrangement of these jets. Different cases were established during this study including different flow discharges, tail water depths and floor jet locations. A base case without using water jets was included to estimate the influence of using suggested water jets arrangements. Additional four cases for various jets arrangements were established and studied. Obtained results were analyzed and graphically presented. The optimum design was easy to be used for increasing the performance of stilling basin. The results indicated that the optimal arrangement of floor jets was the case (D), where the last three rows of floor jets were used. This optimum design results in a reduction in maximum scour depth ranged from 44.53 % to 76.15 % and reduction in scour length ranged from 25.00 % to 71.93 % compared to the base case.


Edward AE. Hydraulic energy dissipators. New York, Toronto,London: Mc-Graw Hill Book Co., Inc.; 1959.

Peterka AJ. Hydraulic design of stilling basin and energy dissipators. Washington, DC: U.S. Dept. of the Interior Bureau of Reclamation; 1978.

Thulï¬kar Razzak Al-Husseini, Abdul-Sahib T. Al-Madhhachi and Zainab A. Naser (2019): "Laboratory experiments and numerical model of local scour around submerged sharp crested weirs", Journal of King Saud University- Engineering Sciences, Jan.2019.

E.A. Elnikhely (2018): "Investigation and analysis of scour downstream of a spillway", Ain Shams Engineering Journal, Vol. 9, Issue 4, Dec., pp. 2275-2282.

Gamal M. Abdel Aal, M. Sobeah, Esam Helal and M. El-Fooly (2017): "Improving energy dissipation on stepped spillways using breakers", Ain Shams Engineering Journal.

Akram Abbaspour, Sahar Parvini, Ali Hosseinzadeh Dalir (2016): "Effect of buried plates on scour proï¬les downstream of hydraulic jump in open channels with horizontal and reverse bed slopes", Water Science and Engineering, Vol. 9, Issue 4, Oct., pp. 329-335.

M. M. Ibrahim (2016): "Bed Configurations of Downstream Sharp Crested Weir with Orifices", Journal of Scientific Research & Reports, Vol. 9, Issue 2, pp. 1-16.

Seungho Hong, Celio Biering, Terry W. Sturm, Kwang Seok Yoon and JuanA. Gonzalez-Castro (2015): " Effect of Submergence and Apron Length on Spillway Scour:Case Study", Journal of water, Vol. 7, Issue 10, 12 Oct., pp.5378-5395.

Mohammad Mahmoud Ibrahim (2015): "Bed proï¬le downstream compound sharp crested V-notch weir", Alexandria Engineering Journal, vol.54, Issue 3, 23April, pp.607-613.

Ahmed Mostafa Ahmed Amin (2015): "Physical model study for mitigating local scour downstream of clear over-fall weirs", Ain Shams Engineering Journal, vol. 6, issue 4, Dec., pp. 1143-1150.

Hossam Mohamed Ali, Mohamed Mohamed El Gendy, Ahmed Mohamed Hassan Mirdan, Abdel Azim Mohamed Ali and Fahmy Salah Fahmy Abdelhaleem (2014): " Minimizing downstream scour due to submerged hydraulic jump using corrugated aprons", Ain Shams Engineering Journal, Vol. 5, Issue4, Dec., pp. 1059-1069.

Esam El-Deen Yousry El-Azab Helal (2014): "Minimizing scour downstream of hydraulic structures using single line of floor water jets", Ain Shams Engineering Journal, Vol. 5, Issue1, Mar., pp. 17-28.

Fahmy Salah Fahmy Abdelhaleem (2013): "Effect of semi-circular baffle blocks on local scour downstream clear-overfall weirs", Ain Shams Engineering Journal, Vol. 4, Issue 4, Dec., pp. 675-684.

M.C. Tuna and M.E. Emiroglu (2011): " Scour profiles at downstream of cascades", Scientia Iranica, Vol. 18, Issue 3, Jun., pp. 338-347.

Dehghani, Amir. Ahmad, Bashiri, Hamid, Meshkati Shahmirzadi, Mohamad Ebrahim and Ahadpour, Asgar (2009): “Experimental Investigation of Scouring in Downstream of Combined flow over Weirs and below Gates", 33rd IAHR Congress: Water Engineering for a Sustainable Environment.




How to Cite

Elsaeed, G., Ali, A. M., El-Hazek, A. N., & Ibraheem, A. M. (2020). Influence of Using Floor Jets on the Local Scour Downstream Fayoum Type Weir. Asian Journal of Engineering and Technology, 8(1).