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GRADUALLY VARIED FLOW
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INTRODUCTION
A STEADY NON-UNIFORM FLOW IN A PRISMATIC
CHANNEL WITH GRADUAL CHANGES IN ITS WATER
SURFACE ELEVATION
THE CHANGES IN THE DEPTH AND VELOCITY
OCCUR GRADUALLY OVER A CONSIDERABLE
LENGTH OF CHANNEL.
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Slope S0, is classified as :
Mild (M) : yn > yc
Steep (S) : yn< yc
Critical (C) : yn = yc
Horizontal (H) : S0 = 0
Adverse (A) : S0 < 0
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FLOW ZONE
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GVF- PROFILE TYPES
Type of flow profile for gradually varied flow is written with
FONT and NUMBER
FONT > slope type
NUMBER > flow zone
M1 M2 M3
S1 S2 S3
C1 C2 C3
X H2 H3
X A2 A3
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FLOW PROFILE - MILD
SLOPE
Dam
CDL
NDLM1
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Sluice gate
Hydraulic jump
M3
M2
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FLOW PROFILE -
STEEP SLOPE
Hydraulic jump
Dam
NDL
CDLS2
S1
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Sluice gate
S3NDL
CDL
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FLOW PROFILE -
CRITICAL SLOPE
Hydraulic jump
C1
weir
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C2
C3
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H2
H3
Sluice gate
Flow profile - horizontal slope
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FLOW PROFILE -
ADVERSE SLOPE
CDL
A2
A3
CDL
Sluice gate