Influence of Inclined Bed Channel on Characteristic of Flow for Step Broad–Crested Weirs

Abstract

Influence of inclined bed channel oncharacteristic of flow for step broad–crested weirs was investigatedexperimentally. Discharge coefficient,water surface profile and Froude number were calculated experimentally.The results showed that water surfaceprofiles were smooth and continues having a descending trend from the point ofmeasurement taking the shape of the weir with a steep drop near the downstreamface of the weir. Increasing effective head to crest height ratio (He/Y)and channel bed slope (So), increased the coefficient of discharge(CD) up to 5%. Also it was found. that for small values of (Fr2),the weir performance tends to the ideal .and with increase (Fr2),the discharge coefficient (CD) decrease for all weir models, becausethe discharge and the velocity heads increases. Empirical equation wasdeveloped on the basis of obtained results.