EXPERIMENTAL VERIFICATION AND REVIEW PERFORMANCE OF THE MODIFIED TRIANGULAR PLAN FORM WEIR

  • SHAKER A. JALIL
  • RONDIK A. JAFAR
  • SAFA S. IBRAHIM
Keywords: Discharge coefficient; Flow efficiency; Free-flow condition; Semi-piano weir; Triangular plan-form weir

Abstract

Weirs are discharge measurement structures have different geometrical shapes. The performances of
the modified triangular plan form weirs were studied under free-flow condition. Three groups of weirs
were tested experimentally. The first group has a flat top; the second has one slope and the third has two
slopes. Each group has three vertex angles (60o
, 90o
and 120o
) with constant height. The hydraulic
performances of weirs are based on the ability to pass the discharge for certain head flow and on the value
of the coefficient of discharge. The values of discharge and the coefficient were compared with earlier
studies being carried on conventional normal weir, broad crest, triangular plan-form and different
labyrinth weirs. All the groups show better performance than conventional shaped and broad weir. The
magnification of the actual discharge to the discharge of broad crested weir is more than one and the best
one is the first in the third group, while the vertex angle is (60o
) for the second and third group and (120o
)
for the first. The performance of the third group is better than rectangular labyrinth weirs, and it is
compatible with the triangular labyrinth. The discharge coefficient decreases with the increase of relative
value of the head to the height of weir except for the first group. Equations for predicting coefficient of
discharge are proposed within the limitations of this test.

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Published
2021-01-06
How to Cite
JALIL, S. A., JAFAR, R. A., & IBRAHIM, S. S. (2021). EXPERIMENTAL VERIFICATION AND REVIEW PERFORMANCE OF THE MODIFIED TRIANGULAR PLAN FORM WEIR. Journal of Duhok University, 23(2), 490-500. Retrieved from https://journal.uod.ac/index.php/uodjournal/article/view/953