Clean Table 10 1 Values Of The Manning Coefficient N Ref 6 Wetted Perimeter N A Natural Channels Clean And Straight 1 (39.03 KiB) Viewed 40 times
Clean Table 10.1 Values of the Manning Coefficient, n (Ref. 6) Wetted Perimeter n A. Natural channels Clean and straight 0.030 Sluggish with deep pools 0.040 Major rivers 0.035 B. Floodplains Pasture, farmland 0.035 Light brush 0.050 Heavy brush 0.075 Trees 0.15 C. Excavated earth channels 0.022 Gravelly 0.025 Weedy 0.030 Stony, cobbles 0.035 D. Artificially lined channels Glass 0.010 Brass 0.011 Steel, smooth 0.012 Steel, painted 0.014 Steel, riveted 0.015 Cast iron 0.013 Concrete, finished 0.012 Concrete, unfinished 0.014 Planed wood 0.012 Clay tile 0.014 Brickwork 0.015 Asphalt 0.016 Corrugated metal 0.022 Rubble masonry 0.025
Table 8.2 Loss Coefficients for Pipe Components (hL=KLV22g) (Data from Refs. 5, 10, 27) Component Кі. a. Elbows Regular 90°, flanged 0.3 V Regular 90 °, threaded 1.5 Long radius 90°, flanged 0.2 0° elbow Long radius 90°, threaded 0.7 Long radius 45°, flanged 0.2 Regular 45, threaded 0.4 9 b. 180 return bends V 180 ° return bend, flanged 0.2 0 180° return bend, threaded 1.5 45 elbow c. Tees Line flow, flanged 0.2 Line flow, threaded 0.9 V Branch flow, flanged 1.0 180 return bond o Branch flow, threaded 2.0 V d. Union, threaded 0.08 Tee *e. Valves V Globe, fully open 10
Water flows in a 2.9-m-diameter finished concrete pipe so that it is completely full and the pressure is constant all along the pipe. If the slope is 5o = 0.0050. (a) determine the flowrate by using open-channel flow methods. Compare this result with (b) that obtained using the pipe flow methods of Chapter 8 (Use Colebrook formula, Table 8.1, Table 10.1 and assume that Re > 106). (a) Q= i m/s (b) Q- i m/s
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