Question

Rainwater flows through the galvanised iron downspout shown in Figure 4 at a rate of 0.006 m3/s. The downspout cross-section is a rectangle with aspect ratio 1.7:1 and is is completely filled with water. The velocity of the water in the gutter at the free surface and head loss associated with the bend can be neglected. Q4. a) Determine the hydraulic diameter of the cross section, in terms of the 2 marks] [2 marks] [3 marks] d) Find the dimensions of the downspout cross-section, in metres. [8 marks] rectangle height, h. b) Find the velocity of the water, in terms of h. c) Determine the Reynolds number, in terms of h 70 mm 4 m 3 m Figure 4. Galvanised iron downspout

Provide detailed solution with assumptions.

Answer 1

autuatly 5.yh (V) -万 Avg velocity D-OO-6 1-7h Apphyins B 2.9 9 29 29Dh PiP Copen to atm) and negleckke VI- o 6.00 353) 2.9

Dh -26 h Dh 1-12 10-6 ue tial and ns mthd for i Andinsthe size Assurne h=o.oy m puut hin er Put in ele Re=79250 , 112.50 o25M6 foron table

Tabulatr valus for debbeunt h vebuey

Plot the graph between f foner and h correct 0.12 0.1 0.08 0.06 _fcorrect 0.04 0.02 0.01 0.02 0.03 0.04 0.05