MEKONNEN BEKELE WORKU2026-02-052023-08-07https://etd.hu.edu.et/handle/123456789/665The experimental determination of baffle blocks installed on stilling basins has been also utilized to stabilize the formation of the jump and increase the turbulence, there by assisting in the dissipation of energy. The main objective of this study is to assess the effects of baffle block parameters on hydraulic jump characteristics. Investigate the influence of baffle blocks on hydraulic jump properties of flow over a weir, to evaluate the effects of different shapes and arrangements of baffle blocks on hydraulic jump characteristics and identify the best shape and arrangement of baffle blocks increasing efficiency of energy loss. The experimental work was performed in a rectangular flume with a dimension of (14 m* 0.3 m* 0.45 m) long, wide, and deep, respectively with Steel, different shapes of baffle blocks (Trapezoidal, Rectangular, and Triangular) with the dimension of (0.05 m*0.0375 m*0.06 m) height, width and length bed material. The experiment was being tested with various flow rates for different shapes and arrangements to analyze the effect on the sequent depth ratio, energy loss, Froud number, and efficiency. Each shape and arrangement baffle have five discharges that were used to maintain the upstream depth the relationship between the Froude number and the discharge for different baffle depth and different velocity; where the average value of the depth was varied (10mm - 50mm). Froude number decreases (1.92-1.54) with the decreases in the average value of loss of energy (0.20–0.14), as the sequent of depth ratio decreases (17.85*10-3 –13.41*10-3 ). The relation between Shape of Baffle Block, Energy Dissipation, and efficiency Trapezoidal (32.19, 70.86%), Rectangular (37.35, 83.98%), Triangular (32.03, 67.23%), and Mixed (34.41, 74.08%) respectively. From above clearly shows that rectangular baffle blocks have higher energy dispassion and efficiency which indicate that the energy dispassion and efficiency in row three and four arrangement 4*3*2 and 4*3*2*1 obtained best are energy dispassion (32.77%) and efficiency (83.98%) receptively under rectangular shapes, which is highest from baffle block shapes relatively better than the other baffle block shapes this is due to may be part of energy dissipate increases efficiency. From this observation rectangular baffle blocks are better for energy dissipation since higher efficiencyenHydraulic jumpFroude numberBaffles blockenergy dispassionSequent depthThesis