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Rohwers formula (1931) Formula

GoMeyers formula (1915) Formula

GoDalton-Type Equation Formula

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Lake Evaporation is a sensitive indicator of the hydrological response to climate change. Variability in annual lake evaporation is assumed to be controlled by the surface solar radiation. Check FAQs

E lake = 0.771 \cdot (1.465 - 0.00073 \cdot P a) \cdot (0.44 + 0.0733 \cdot u 0) \cdot (e s - e a)

E_lake - Lake Evaporation?P_a - Atmospheric Pressure?u₀ - Mean Wind Velocity at Ground Level?e_s - Saturation Vapour Pressure?e_a - Actual Vapour Pressure?

Rohwers formula (1931) Example

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Here is how the Rohwers formula (1931) equation looks like with Units.

Here is how the Rohwers formula (1931) equation looks like.

12.3779 = 0.771 \cdot (1.465 - 0.00073 \cdot 4) \cdot (0.44 + 0.0733 \cdot 4.3) \cdot (17.54 - 3)

12.3779 = 0.771 \cdot (1.465 - 0.00073 \cdot 4mmHg) \cdot (0.44 + 0.0733 \cdot 4.3km/h) \cdot (17.54mmHg - 3mmHg)

12.3779 = 0.771 \cdot (1.465 - 0.00073 \cdot 4) \cdot (0.44 + 0.0733 \cdot 4.3) \cdot (17.54 - 3)

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Rohwers formula (1931) Solution

Follow our step by step solution on how to calculate Rohwers formula (1931)?

FIRST Step Consider the formula

E lake = 0.771 \cdot (1.465 - 0.00073 \cdot P a) \cdot (0.44 + 0.0733 \cdot u 0) \cdot (e s - e a)

Next Step Substitute values of Variables

∴

E lake = 0.771 \cdot (1.465 - 0.00073 \cdot 4mmHg) \cdot (0.44 + 0.0733 \cdot 4.3km/h) \cdot (17.54mmHg - 3mmHg)

Next Step Prepare to Evaluate

∴

E lake = 0.771 \cdot (1.465 - 0.00073 \cdot 4) \cdot (0.44 + 0.0733 \cdot 4.3) \cdot (17.54 - 3)

Next Step Evaluate

∴

E lake = 12.3778766785784

LAST Step Rounding Answer

∴

E lake = 12.3779

Rohwers formula (1931) Formula Elements

Variables

Lake Evaporation

Lake Evaporation is a sensitive indicator of the hydrological response to climate change. Variability in annual lake evaporation is assumed to be controlled by the surface solar radiation.

Symbol: E_lake

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Lake Evaporation

Atmospheric Pressure

Atmospheric Pressure or mean barometric pressure (mm of mercury).

Symbol: P_a

Measurement: PressureUnit: mmHg

Note: Value can be positive or negative.

Formulas to find Atmospheric Pressure

Mean Wind Velocity at Ground Level

Mean Wind Velocity at Ground Level in km/hr which can be taken to be the velocity at 0.6m height above the ground.

Symbol: u₀

Measurement: SpeedUnit: km/h

Note: Value should be greater than 0.

Formulas to find Mean Wind Velocity at Ground Level

Saturation Vapour Pressure

Saturation Vapour Pressure at Water Surface (mm of mercury) is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature.

Symbol: e_s

Measurement: PressureUnit: mmHg

Note: Value can be positive or negative.

Formulas to find Saturation Vapour Pressure

Actual Vapour Pressure

Actual Vapour Pressure is the air in mm of mercury is the vapour pressure exerted by the water in the air.

Symbol: e_a

Measurement: PressureUnit: mmHg

Note: Value should be greater than 0.

Formulas to find Actual Vapour Pressure

Other Formulas to find Lake Evaporation

Go Meyers formula (1915)

E lake = K m \cdot (e s - e a) \cdot (1 + \frac{u 9}{16})

Go Dalton-Type Equation

E lake = K \cdot f u \cdot (e s - e a)

Other formulas in Evaporation category

Go Dalton's Law of Evaporation

E = K o \cdot (e s - e a)

Go Vapour Pressure of Water at given Temperature for Evaporation in Water Bodies

e s = (\frac{E}{K o}) + e a

Go Vapour Pressure of Air using Dalton's Law

e a = e s - (\frac{E}{K o})

How to Evaluate Rohwers formula (1931)?

Rohwers formula (1931) evaluator uses Lake Evaporation = 0.771*(1.465-0.00073*Atmospheric Pressure)*(0.44+0.0733*Mean Wind Velocity at Ground Level)*(Saturation Vapour Pressure-Actual Vapour Pressure) to evaluate the Lake Evaporation, The Rohwers Formula (1931) formula is defined as it accounts for the effect of pressure in addition to the wind speed at a height of 0.6 m above free water surface (km/hr). Lake Evaporation is denoted by E_lake symbol.

How to evaluate Rohwers formula (1931) using this online evaluator? To use this online evaluator for Rohwers formula (1931), enter Atmospheric Pressure (P_a), Mean Wind Velocity at Ground Level (u₀), Saturation Vapour Pressure (e_s) & Actual Vapour Pressure (e_a) and hit the calculate button.

FAQs on Rohwers formula (1931)

What is the formula to find Rohwers formula (1931)?

The formula of Rohwers formula (1931) is expressed as Lake Evaporation = 0.771*(1.465-0.00073*Atmospheric Pressure)*(0.44+0.0733*Mean Wind Velocity at Ground Level)*(Saturation Vapour Pressure-Actual Vapour Pressure). Here is an example- 12.37788 = 0.771*(1.465-0.00073*533.288)*(0.44+0.0733*1.19444444444444)*(2338.46788-399.966).

How to calculate Rohwers formula (1931)?

With Atmospheric Pressure (P_a), Mean Wind Velocity at Ground Level (u₀), Saturation Vapour Pressure (e_s) & Actual Vapour Pressure (e_a) we can find Rohwers formula (1931) using the formula - Lake Evaporation = 0.771*(1.465-0.00073*Atmospheric Pressure)*(0.44+0.0733*Mean Wind Velocity at Ground Level)*(Saturation Vapour Pressure-Actual Vapour Pressure).

What are the other ways to Calculate Lake Evaporation?

Here are the different ways to Calculate Lake Evaporation-

Lake Evaporation=Coefficient Accounting for Other Factors*(Saturation Vapour Pressure-Actual Vapour Pressure)*(1+Monthly Mean Wind Velocity/16)
Lake Evaporation=Coefficient*Wind Speed Correction Factor*(Saturation Vapour Pressure-Actual Vapour Pressure)

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Rohwers formula (1931) Formula

​GoMeyers formula (1915) Formula

​GoDalton-Type Equation Formula

Rohwers formula (1931) Example

Rohwers formula (1931) Solution

Rohwers formula (1931) Formula Elements

Other Formulas to find Lake Evaporation

Other formulas in Evaporation category

How to Evaluate Rohwers formula (1931)?

FAQs on Rohwers formula (1931)

Variable Name

GoMeyers formula (1915) Formula

GoDalton-Type Equation Formula