Meyers formula (1915) Calculator

✖Coefficient accounting for other factors (0.36 for large deep water bodies, 0.5 for small shallow water bodies).ⓘ Coefficient Accounting for Other Factors [K_m]			+10% -10%
✖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.ⓘ Saturation Vapour Pressure [e_s]			+10% -10%
✖Actual Vapour Pressure is the air in mm of mercury is the vapour pressure exerted by the water in the air.ⓘ Actual Vapour Pressure [e_a]			+10% -10%
✖Monthly Mean Wind Velocity in km/hr is usually taken at about 9m above the ground.ⓘ Monthly Mean Wind Velocity [u₉]			+10% -10%

✖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.ⓘ Meyers formula (1915) [E_lake]

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Meyers formula (1915) Solution

STEP 0: Pre-Calculation Summary

Formula Used

Lake Evaporation = Coefficient Accounting for Other Factors*(Saturation Vapour Pressure-Actual Vapour Pressure)*(1+Monthly Mean Wind Velocity/16)
E_lake = K_m*(e_s-e_a)*(1+u₉/16)
This formula uses 5 Variables

Variables Used

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.
Coefficient Accounting for Other Factors - Coefficient accounting for other factors (0.36 for large deep water bodies, 0.5 for small shallow water bodies).
Saturation Vapour Pressure - (Measured in Millimeter Mercury (0 °C)) - 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.
Actual Vapour Pressure - (Measured in Millimeter Mercury (0 °C)) - Actual Vapour Pressure is the air in mm of mercury is the vapour pressure exerted by the water in the air.
Monthly Mean Wind Velocity - (Measured in Kilometer per Hour) - Monthly Mean Wind Velocity in km/hr is usually taken at about 9m above the ground.

STEP 1: Convert Input(s) to Base Unit

Coefficient Accounting for Other Factors: 0.36 --> No Conversion Required
Saturation Vapour Pressure: 17.54 Millimeter Mercury (0 °C) --> 17.54 Millimeter Mercury (0 °C) No Conversion Required
Actual Vapour Pressure: 3 Millimeter Mercury (0 °C) --> 3 Millimeter Mercury (0 °C) No Conversion Required
Monthly Mean Wind Velocity: 21.9 Kilometer per Hour --> 21.9 Kilometer per Hour No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

E_lake = K_m*(e_s-e_a)*(1+u₉/16) --> 0.36*(17.54-3)*(1+21.9/16)

Evaluating ... ...

E_lake = 12.398985

STEP 3: Convert Result to Output's Unit

12.398985 --> No Conversion Required

FINAL ANSWER

12.398985 ≈ 12.39898 <-- Lake Evaporation

(Calculation completed in 00.020 seconds)

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< Evaporation Calculators

Rohwers formula (1931)

LaTeX Go 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)

Meyers formula (1915)

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

Dalton-Type Equation

LaTeX Go Lake Evaporation = Coefficient*Wind Speed Correction Factor*(Saturation Vapour Pressure-Actual Vapour Pressure)

Dalton's Law of Evaporation

LaTeX Go Evaporation from Water Body = Proportionality Constant*(Saturation Vapour Pressure-Actual Vapour Pressure)

Meyers formula (1915) Formula

LaTeX Go

Lake Evaporation = Coefficient Accounting for Other Factors*(Saturation Vapour Pressure-Actual Vapour Pressure)*(1+Monthly Mean Wind Velocity/16)
E_lake = K_m*(e_s-e_a)*(1+u₉/16)

What is Evaporation?

Evaporation is the process in which a liquid changes to the gaseous state as the free surface, below its boiling point, through the transfer of energy.

How to Calculate Meyers formula (1915)?

Meyers formula (1915) calculator uses Lake Evaporation = Coefficient Accounting for Other Factors*(Saturation Vapour Pressure-Actual Vapour Pressure)*(1+Monthly Mean Wind Velocity/16) to calculate the Lake Evaporation, The Meyers formula (1915) formula is defined as empirical equations for estimating lake evaporation by the parameters vapour pressure of water surface and air and mean monthly wind velocity measured at a height of 9 m above free water surface. Lake Evaporation is denoted by E_lake symbol.

How to calculate Meyers formula (1915) using this online calculator? To use this online calculator for Meyers formula (1915), enter Coefficient Accounting for Other Factors (K_m), Saturation Vapour Pressure (e_s), Actual Vapour Pressure (e_a) & Monthly Mean Wind Velocity (u₉) and hit the calculate button. Here is how the Meyers formula (1915) calculation can be explained with given input values -> 12.39898 = 0.36*(2338.46788-399.966)*(1+6.08333333333333/16).

FAQ

What is Meyers formula (1915)?

The Meyers formula (1915) formula is defined as empirical equations for estimating lake evaporation by the parameters vapour pressure of water surface and air and mean monthly wind velocity measured at a height of 9 m above free water surface and is represented as E_lake = K_m*(e_s-e_a)*(1+u₉/16) or Lake Evaporation = Coefficient Accounting for Other Factors*(Saturation Vapour Pressure-Actual Vapour Pressure)*(1+Monthly Mean Wind Velocity/16). Coefficient accounting for other factors (0.36 for large deep water bodies, 0.5 for small shallow water bodies), 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, Actual Vapour Pressure is the air in mm of mercury is the vapour pressure exerted by the water in the air & Monthly Mean Wind Velocity in km/hr is usually taken at about 9m above the ground.

How to calculate Meyers formula (1915)?

The Meyers formula (1915) formula is defined as empirical equations for estimating lake evaporation by the parameters vapour pressure of water surface and air and mean monthly wind velocity measured at a height of 9 m above free water surface is calculated using Lake Evaporation = Coefficient Accounting for Other Factors*(Saturation Vapour Pressure-Actual Vapour Pressure)*(1+Monthly Mean Wind Velocity/16). To calculate Meyers formula (1915), you need Coefficient Accounting for Other Factors (K_m), Saturation Vapour Pressure (e_s), Actual Vapour Pressure (e_a) & Monthly Mean Wind Velocity (u₉). With our tool, you need to enter the respective value for Coefficient Accounting for Other Factors, Saturation Vapour Pressure, Actual Vapour Pressure & Monthly Mean Wind Velocity and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Lake Evaporation?

In this formula, Lake Evaporation uses Coefficient Accounting for Other Factors, Saturation Vapour Pressure, Actual Vapour Pressure & Monthly Mean Wind Velocity. We can use 2 other way(s) to calculate the same, which is/are as follows -

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)
Lake Evaporation = Coefficient*Wind Speed Correction Factor*(Saturation Vapour Pressure-Actual Vapour Pressure)

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