Geometry Modification of Stilling Basin USBR VI with Numerical Simulation

Document Type : Research Article


1 Civil Engineering Group, Engineering Department, Hakim Sabzevari University

2 Civil Engineering and environmental Department, Tarbiat Modares University of Tehran

3 Civil Engineering and Environmental Department, Amirkabir University

4 Civil Engineering and Environmental Department, Tarbiat Modares University of Tehran


Stilling Basin USBR VI is one of the most commonly impact type energy dissipaters. Also this basin
is one of the oldest basins that designed for dissipating of outlet flow from the pipes. This basin is a
small box-like structure with a hanging wall and an endsill. Hanging wall is to distribute energy of
incoming flow to basin width. This basin requires no tailwater for successful performance. Numerical
model validation was performed with comparison of recorded pressure on hanging wall and flow
depth on endsill in physical model and with comparison of incoming pipe velocity profile with
nikuradse physical result in 1932. For basin outlet flow field modification, 4 parameters of mean
velocity on endsill, mean velocity in vicinity of endsill, coriolis coefficient and discharge distribution
on endsill was selected. These parameters were calculated for more than 100 different models. Finally,
with comparison of results of parameters in different models, it is found that gradual variation of width
of stilling basin has had the best results after vertical wall for the modification of stilling basin and
uniform distributing of flow rate in width direction.


Aisenbrey, A.J., (1978). “Design of small canal structures, 1978: engineering technology pertaining primarily to the design of small canal structures of less than 100-cubic-feet-per-second capacity”. A Water Resources Technical Publication (USA).
Aleyasin, S.S., Fathi, N. and Vorobieff, P., (2015). “Experimental Study of the Type VI Stilling Basin Performance”. Journal of Fluids Engineering, 137(3), p. 034503.
Babaali, H., Shamsai, A. and Vosoughifar, H., (2015). “Computational modeling of the hydraulic jump in the stilling basin with convergence walls using CFD codes”. Arabian Journal for Science and Engineering, 40(2), pp. 381-395.
Beichley, G., (1978). “Hydraulic Design of Stilling Basin for Pipe or Channel Outlets”, Denver: USBR.
Bradley, J. & Peterka, A., (1955). “Progress Report No. II-Research Study on Stilling Basin, Energy Dissipator and Associated Appurtenances”, Denver: USBR.
Flow-3D, (2010). Flow-3D User Manual, Version 10.0. Flow Science, Inc., 10 edition.
Hattori, H. and Nagano, Y., (2010). “Investigation of turbulent boundary layer over forward-facing step via direct numerical simulation”. International Journal of Heat and Fluid Flow, 31(3), pp. 284-294
Nohani, E., (2015). “Numerical Simulation of the Flow Pattern on Morning Glory Spillways”. International Journal of Life Sciences, 9(4), pp. 28-31.
Peterka, A.J., (1984). Engineering monograph No. 25.
Schlichting, H. and Gersten, K., (2003). Boundary-layer theory. Springer Science & Business Media.
Seyedashraf, O., Elyasi, S., (2015), “Flow Structures in Sharply-Curved OpenChannel Bends-Numerical Comparison of Two CFD Models”, International Journal of Engineering & Technology Sciences.
Silva, M.R., (2013), “3D numerical modeling of flow along spillways with free surface flow. Complementary spillway of Salamonde”, TECNICO Lisboa.
Tiwari, H., (2013). “Analysis of baffle wall gap in the design of stilling basin model”. Int. J. Civil Eng, 4(4), pp. 66-71.
Verma, D., and Goel, A., (2000), “Stilling Basins for Pipe Outlets Using Wedge Shaped Splitter Block”, J. Irrig. Drain. Eng., 126(3), pp. 179–184.
Verma, D.V.S. and Goel, A., (2003). “Development of efficient stilling basins for pipe outlets”. Journal of irrigation and drainage engineering, 129(3), pp. 194-200.
  • Receive Date: 17 September 2017
  • Revise Date: 02 December 2018
  • Accept Date: 23 December 2018
  • First Publish Date: 21 January 2019