STANDARDIZATION OF CHIMNEY WEIR FOR REGULATING WASTE WATER IN GRIT CHAMBERS

Radhakrishna A.R, Ravikumar A. S

Abstract: It was aimed to lend confidence to prospective users of Weirs pioneered in Indian Institute of Science Bangalore by Standardization which consists of testing the flow measuring instrument under varying conditions, so that range of application could be trusted eliminating any unpleasant surprises highlighted which could be awaiting the user working beyond the recommended range. The experimental work in I.I.Sc was restricted to just a few weirs. Chimney weirs find applications in grit chamber outlets since they maintain a constant average velocity of flow whatever may be the depth of flow. This unique property of constant average velocity allows uniform settlement of grit whatever may be the depth of flow. But for the industry to use the weir the work of standardization has to be undertaken. The work of standardization includes the determination of sensitivity of the experimental parameters (here coefficient of discharge Cd). This work was undertaken in the new channel funded by VTU. Eccentricities were imparted to the weir both in horizontal and vertical direction and sensitivity of Cd and variation of Cd with these eccentricities were experimentally determined. Total numbers of one plus ten weirs were fabricated for the determination of cd for two batches of students. Measured discharge.a

Keywords: Standardization, Chimney, Weir

DOI: https://doi.org/10.15623/ijret.2016.0530020