EXPERIMENTS TO STUDY THE EFFECT OF DISSIPATION BLOCKS UPON ENERGY OF FLOW DOWNSTREAM THE COMPOUND WEIRS

The objective of this study was to investigate the hydraulic characteristics such as energy dissipation, reduction of hydraulic jump and roller length on unconventional types of blocks using the experimental works. Values of the relative energy dissipation ratio (E 2 /E 1 ), relative length of hydraulic jump (L j /Y 2 ), and relative roller length (L r / ? Y) for different blocks in this study were found in terms of the primary Froude numbers. Results indicated that the compound weir with (60 ° , 90 ° ) lower V-notch with all dissipation blocks have a high efficiency especially at the high discharges. Also, the hydraulic characteristics values of applied discharges on the surface of the triangular cut angles with (45 ° , 60 ° ) were better than other configuration of blocks.