-

Weirs are structures that have applications in water conveyance systems. Usually, weirs are constructed normal to the now direction. Otherwise, they
are called oblique weirs. The 1enght of the oblique weirs are longer than the normal ones. The oblique weirs are essentially different from the normal weirs
from hydraulics point of view because of having a longer lenght and different angle. One of the main hydraulic features is the relationship between total head and the discharge passing through the weir. In this equation the now passing over the weir (Q) is directly proportional to the total head (H) multiplied by discharge coefficient (Cd)' Therefore, Q ex: Cdx Hk x L. In the
above relationship K is an exponent depending on the type of weir. A
dimensional analysis shows that the coefficient Cd is a function of several factors. For a rectangular broad crested weir the relationship can be written as
below: Cd = l' (a, HIB, HIP) Where a is the angle of declination, H is the total head, P is the height of weir and B is the width of weir in the tlow
direction. In this study the total number of conducted experiments are 42.The results are presented in the form of the figures.