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Green Ampt Equation Formula

GoInfiltration Capacity given Green-Ampt Parameters of Infiltration Model Formula

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Infiltration Capacity at Any Time t from the start of the rainfall is the rate at which water percolates in the soil. Check FAQs

f p = K \cdot (1 + \frac{η \cdot S c}{F p})

f_p - Infiltration Capacity at Any Time t?K - Darcy's Hydraulic Conductivity?η - Porosity?S_c - Capillary Suction at Wetting Front?F_p - Cumulative Infiltration Capacity?

Green Ampt Equation Example

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Here is how the Green Ampt Equation equation looks like with Values.

Here is how the Green Ampt Equation equation looks like with Units.

Here is how the Green Ampt Equation equation looks like.

14.95 = 13 \cdot (1 + \frac{0.5 \cdot 6}{20})

14.95cm/h = 13cm/h \cdot (1 + \frac{0.5 \cdot 6}{20cm/h})

14.95 = 13 \cdot (1 + \frac{0.5 \cdot 6}{20})

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Green Ampt Equation Solution

Follow our step by step solution on how to calculate Green Ampt Equation?

FIRST Step Consider the formula

f p = K \cdot (1 + \frac{η \cdot S c}{F p})

Next Step Substitute values of Variables

∴

f p = 13cm/h \cdot (1 + \frac{0.5 \cdot 6}{20cm/h})

Next Step Prepare to Evaluate

∴

f p = 13 \cdot (1 + \frac{0.5 \cdot 6}{20})

Next Step Evaluate

∴

f p = 4.15277777777778E-05m/s

LAST Step Convert to Output's Unit

∴

f p = 14.95cm/h

Green Ampt Equation Formula Elements

Variables

Infiltration Capacity at Any Time t

Infiltration Capacity at Any Time t from the start of the rainfall is the rate at which water percolates in the soil.

Symbol: f_p

Measurement: SpeedUnit: cm/h

Note: Value should be greater than 0.

Formulas to find Infiltration Capacity at Any Time t

Darcy's Hydraulic Conductivity

Darcy's Hydraulic Conductivity measures soil's ability to transmit water, vital in understanding groundwater flow and environmental processes.

Symbol: K

Measurement: SpeedUnit: cm/h

Note: Value can be positive or negative.

Formulas to find Darcy's Hydraulic Conductivity

Porosity

Porosity is the ratio of volume of voids to volume of soil.

Symbol: η

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Porosity

Capillary Suction at Wetting Front

Capillary Suction at Wetting Front is due to capillary attraction in the soil voids and is large for fine grained soils such as clays and small for sandy soils.

Symbol: S_c

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Capillary Suction at Wetting Front

Cumulative Infiltration Capacity

Cumulative Infiltration Capacity is calculated by subtracting the cumulative runoff from the cumulative rainfall.

Symbol: F_p

Measurement: SpeedUnit: cm/h

Note: Value should be greater than 0.

Formulas to find Cumulative Infiltration Capacity

Other Formulas to find Infiltration Capacity at Any Time t

Go Infiltration Capacity given Green-Ampt Parameters of Infiltration Model

f p = m + \frac{n}{F p}

Other formulas in Green Ampt Equation (1911) category

Go Porosity of Soil given Infiltration Capacity from Green-Ampt Equation

η = (\frac{f p}{K} - 1) \cdot \frac{F p}{S c}

Go Capillary Suction given Infiltration Capacity

S c = (\frac{f p}{K} - 1) \cdot \frac{F p}{η}

Go Darcy's Hydraulic Conductivity given Infiltration Capacity from Green-Ampt Equation

K = \frac{f p}{1 + \frac{η \cdot S c}{F p}}

Go Cumulative Infiltration Capacity given Green-Ampt Parameters of Infiltration Model

F p = \frac{n}{f p - m}

How to Evaluate Green Ampt Equation?

Green Ampt Equation evaluator uses Infiltration Capacity at Any Time t = Darcy's Hydraulic Conductivity*(1+(Porosity*Capillary Suction at Wetting Front)/Cumulative Infiltration Capacity) to evaluate the Infiltration Capacity at Any Time t, The Green Ampt Equation formula is defined as a simplified representation of the infiltration process. It assumes a homogeneous soil profile and a uniform distribution of initial soil water content. Infiltration Capacity at Any Time t is denoted by f_p symbol.

How to evaluate Green Ampt Equation using this online evaluator? To use this online evaluator for Green Ampt Equation, enter Darcy's Hydraulic Conductivity (K), Porosity (η), Capillary Suction at Wetting Front (S_c) & Cumulative Infiltration Capacity (F_p) and hit the calculate button.

FAQs on Green Ampt Equation

What is the formula to find Green Ampt Equation?

The formula of Green Ampt Equation is expressed as Infiltration Capacity at Any Time t = Darcy's Hydraulic Conductivity*(1+(Porosity*Capillary Suction at Wetting Front)/Cumulative Infiltration Capacity). Here is an example- 1.2E+6 = 3.61111111111111E-05*(1+(0.5*6)/5.55555555555556E-05).

How to calculate Green Ampt Equation?

With Darcy's Hydraulic Conductivity (K), Porosity (η), Capillary Suction at Wetting Front (S_c) & Cumulative Infiltration Capacity (F_p) we can find Green Ampt Equation using the formula - Infiltration Capacity at Any Time t = Darcy's Hydraulic Conductivity*(1+(Porosity*Capillary Suction at Wetting Front)/Cumulative Infiltration Capacity).

What are the other ways to Calculate Infiltration Capacity at Any Time t?

Here are the different ways to Calculate Infiltration Capacity at Any Time t-

Infiltration Capacity at Any Time t=Parameter 'm' of Infiltration Model by Green-Ampt+Parameter 'n' of Infiltration Model by Green-Ampt/Cumulative Infiltration Capacity

Can the Green Ampt Equation be negative?

No, the Green Ampt Equation, measured in Speed cannot be negative.

Which unit is used to measure Green Ampt Equation?

Green Ampt Equation is usually measured using the Centimeter per Hour[cm/h] for Speed. Meter per Second[cm/h], Meter per Minute[cm/h], Meter per Hour[cm/h] are the few other units in which Green Ampt Equation can be measured.

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Green Ampt Equation Formula

​GoInfiltration Capacity given Green-Ampt Parameters of Infiltration Model Formula

Green Ampt Equation Example

Green Ampt Equation Solution

Green Ampt Equation Formula Elements

Other Formulas to find Infiltration Capacity at Any Time t

Other formulas in Green Ampt Equation (1911) category

How to Evaluate Green Ampt Equation?

FAQs on Green Ampt Equation

Variable Name

GoInfiltration Capacity given Green-Ampt Parameters of Infiltration Model Formula