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This paper present the effect of the lower gate lip on the coefficient of contraction, velocity and discharge which have been made in a rectangular flume with four gates opening from (2 to 4.5) cm, five different discharges from (6.2 to 18.15) l/s and five different gate cases (vertical and inclined vertically) by angle (45)˚ with and opposite flow direction with horizontal and sharp lower lip. The values of coefficients of contraction (C c) and discharge (C d) increases when gate slope increases with flow direction and the lower lip is horizontal, these increases are (16)% and (18)% respectively, while these values decreases when gate slope increases opposite flow direction and the lower lip is horizontal these decreases are (13)% and (11)% respectively. The values of coefficient of velocity (C v) remain constant and don't effect with changes of gate slope or gate lip.

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This paper presents an experimental study and analysis for effect of channel slope on straight vertical and skew free overfall for a rectangular channel with different slopes. The relationship between the critical depth and brink depth for both vertical and skew free overfall are found and shown to be influenced by channel slope. The measured discharge from standard weir was compared with calculated discharge from theoretical equation and found that the discharge over skewed model is greater by (21%) from straight vertical, and the error percentage for calculated and measured discharge not exceed (15% and 12%) for skewed and vertical models respectively for all slopes. The discharge coefficient for vertical model is greater by (25%) than skew, relationships between end and critical depths (h e /h c) with channel slope for straight vertical and skew free overfall were calculated.