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The main objective of this investigation is to study experimentally the water surface profiles and to obtain convenient expressions for the estimation of discharge coefficients (C d ) for free flow over chimney weir and the discharge factor (q/q 1 ) for submerged flow. Four chimney weir models with different vertex angles were constructed and tested, the surface water profiles, for all models were smooth upstream and fall suddenly downstream the model and at a high discharge it become concavedoi:10.33899/rengj.2005.45573 fatcat:346ffx7lu5c45cne7igqmh4h6y