Abstract

Discharge Coefficient of Submerged Rectangular Orifice Abstract Submerged rectangular orifice is among discharge measuring device which is suitable in small canal especially when the amount of fall is not adequate for application of weir during the past decade many studied have been conducted for evaluation of discharge coefficient of orifice. For free and semi-free orifice equation for evaluation of this coefficient have been developed. However for the case of submerged orifice only an average value of 0.61 has been mentioned in literature. Since this coefficient depends to the flow characteristics and the orifice dimensions, an equation for determination of discharge coefficient is needed. The development of such formula is the main goal of study. To do so an experiment program was conducted and applying the dimensional analysis and data obtained from these tests, two relations were developed. These relations can be used where an accurate value of the consequently the flow discharge is needed. Key words: Orifice, Coefficient orifice, Hydraulic, Discharge measuring devices