SubSurface%20Irrigation

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SubSurface Irrigation
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EQUIVALENT K FOR VERTICAL FLOW
When flow is perpendicular to a series of soil
layers, the flux through each layer is the same.
D D1 D2 ...Dn
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EQUIVALENT K FOR HORIZONTAL FLOW
L
Hb
Ha
When flow is parallel to a series of soil layers,
the discharge through unit thickness of the
system is the sum of the discharges through the
layers..
K1
Q1
D1
Q2
K2
D2
Qn
Dn
Kn
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Hooghoudt Equation
m
S
d
IMPERMEABLE LAYER
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Subsurface Drainage Equation
y0
m
S
d
IMPERMEABLE LAYER
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Estimating Spacing using The Drainage Equation
DC Drainage Coefficient
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Estimating Spacing using The Sub Irrigation
Equation
IC Irrigation Coefficient
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