Sediment Transport

DESIGN OF A STABLE UNLINED TRAPEZIODAL CHANNEL (LANE'S METHOD) DATA D35 = 15 D50 = 40 Dm = 42 D60 = 50

D75 = 55 D90 = 70 ρs = 2680

mm mm mm mm

Q = 35

So =

mm mm kg/m3 m3/s

B/Y = z=

CALCULATION Side slope angle, α =

26.6

Angle response, θ =

37

Tractive force ratio, κ =

0.67

τb/γys =

0.77

Coefficient for channels =

τb = = τc =

τs =

OK

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sin2α =

0.2000

sin2θ =

0.3622

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1 0.77 2.68 4.00 2.68

y kg/m2 kg/m2 kg/m2

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B=

Dimensional Depth, y =

3.48

m

Manning coeeficient, n =

0.06

Width, B =

8.7

m

Velocity, v =

0.98

m/s

Discharge, Q =

53.3

m3/s

Area, A =

54.50 m2

Wetted perimeter, P =

24.26 m

Hydraulics radius, R =

2.25 m

CHECKED Discharge = Qdesign < Qallw……..OK

τb Computed 2.68

τb Graph <

4.00

PREPARED BY MO

L (LANE'S METHOD)

0 2.5 2

y = 3.48 m

8.7

m

PREPARED BY MOHD HAIRUL BIN KHAMIDUN GS 24188

FIGURE A BACK

FIGURE B BACK

FIGURE C BACK