Question

U JUULI SU U U ULJCOPUL UU . (1 pt) When set at a slope So = 0.01, the specific energy in a 6-inch wide rectangular flume is 0.5 ft. Calculate the Manning n for the flume, assuming that the flow is supercritical at a flow rate of 0.5 ft/s. Based on the calculated Manning n estimate what the channel material is likely made of

Answer 1

Given :- slope a 0.01 B= 6 inch = 0.5ft [1 ft = 12inch] t = 0.5 ft (especific Q 2015 ft/s specific energy (6) 2 y + 3 2 2 enegg) 0.5 = y + 2 x 2g 0.5=4+ y 2 2x32.2 (64.443 -32.242 +120) soluung this car we get y = 0.405 – 0.154 0.248 These Tuco answers are posible. But flow is super-critical given Critical depth (Y) 2 (1 261 7:9. e 2 0.314 ft L 82.24 In seper-critical flow, flow depth is less than critical lepth. 1 y 2 0.248 fe] 2.21

h OM G - LA R 0.5. (manning & formunda] coco 1924 G. 73 5- 105 x 0.298 (0.540.248 [0.5 + 2X0.248 ] → 720.0068.

Based on the manning's roughness coefficient value the channel material is most likely be PLASTIC