Question

2. A stream is flowing bankfull at 1 m deep, 25 m wide and losing 80 cm of head over one kilometer. The bed material is 0.5 mm uniform sand. The channel has a sinuosity of 1.5 dense grassy bank, and rectangular geometry. Estimate the following: a. Shear velocity, u., in m/s y=1.31x156 m²/s b. Laminar sublayer thickness, 8, at 10° C in mm C. Grain Reynolds number, Re., at 10°C d. Boundary shear stress, t, in Pa e. Shields parameter, f. Type of bedforms (consider Figure 3.13 in HIRE) g. Manning's n h. Darcy-Wesbach friction factor, f o ol i. Discharge, Q, in cms and cfs j. Critical depth, h, in meters k. Total stream power in W/m 2 1. Specific stream power in W/m? m. Froude number n. Maximum height of a grade control structure that will not cause backwater at your estimated discharge

Answer 1

Solution 25m Spe chamaad = S0 - Cros-chorn Channel L =1 km lovo m lo,000 dra adins g channl A CAvea crous-chin P tfnimater) olrau A = 1x25 = 25 m2- P=25 + 2xl = 27 m R 25 27 stear sta T = YRS T= 981o x 25 (rUnit wtwader 27 0,au T 7. 27 Panak skn vilaity S = Denxy 0 ter o00 u +27 ouo U* = 0.035 m/sAM Laminan Sub = 8 = 1I. £ V Cat lo'c

S11.6x31 xlo- S Cat lo'c O18 m m Grain kaynalo's number Re *at lo'C Rit Cat lo'c)- U od d= f tdmaterial o Ooo 5 m 3 o 3244 |he Catloc) - 32.44 Gnain aynald's T7-27 la No T 7.27 Pa A A-s