Question

9. Water is flowing in a rectangular flume with a velocity of 3.81 m/s and a depth of 0.98m. (a) is the flow at the upper or lower stage? (b) Compute the specific energy. (c) What is the alternate depth of flow with equal energy?

Answer 1

V= 3.81 mis D: 0.98 m co froude's number of flow ✓ Vg D 381 J9.81 x 0.98 LTS 1.228 21 Hence, flow is super critical flow is is shallow and fast ... flow is in CScanned with CamScanner upper stage

(b) Specific energy flow . gro E = v² y 29 0.98 + (3.81) 2 249.81 0.98 + 0.14 cut 1.72 m CSscanned with CamScanner

To find alternate_depth of some energy 2 E = y + ₂ 2g at be both alteenate depths Velocity of discharge different but flow will be same may AzV₂ A, V, 5 Ves ;. A, Vi Az Bx0.98 X 3.81 BX Y₂ :: V2 = 3.7338 Yz 2 1.72 4g + (3.7338) 2 2x9.8lxy 2 Y2 1:72 0.71 4² 3 2 Yz 1.72 y, +0.7 :. By solving this ego we get. y = 1.299m Yp 0.98 m. Alternate depth of flow with equal energy 1.299 m. CS Scanned with CamScanner