# How do you calculate evaporation from a lake?

## How do you calculate evaporation from a lake?

The Penman formula for the evaporation rate from a lake is simplified to the following: E 0 = 700 T m / ( 100 − A ) + 15 ( T − T d ) ( 80 − T ) ( mm day − 1 ) where Tm = T + 0.006h, h is the elevation (metres), T is the mean temperature, A is the latitude (degrees) and Td is the mean dew-point.

How do you calculate the evaporation loss in a pond?

To be exact, divide Gallons Lost Per Week by Gallons In 1 Inch of Water: 35 / 40 = . 875 Inches per week of evaporation.

### How does surface area relate to evaporation?

Molecules contained in a liquid evaporate from the surface area. This means that the larger the surface area, the faster the rate of evaporation.

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How do you measure evaporation?

Evaporation is measured by means of evaporimeters. Evaporimeters are pans containing water which are exposed to atmosphere. The loss of water by evaporation is measured at regular intervals.

## How do you find the surface area of a lake?

Rectangular or square shape area is estimated by simply measuring the length and width of the pond sides in feet. Multiply the length times the width to get the square feet of surface area. This value can be converted to acres by dividing by 43,560 ft2/acre.

How rate of evaporation is related to surface area of liquid?

A substance that has a larger surface area will evaporate faster, as there are more surface molecules per unit of volume that are potentially able to escape. the higher the temperature of the substance the greater the kinetic energy of the molecules at its surface and therefore the faster the rate of their evaporation.

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### How is the rate of evaporation of a liquid affected by the surface area of a liquid exposed to air?

As intermolecular forces increase; rate of evaporation decreases. As surface area increases, rate of evaporation also increases. This is because evaporation occurs among the molecules on the surface, not in the interior. This means; increasing the surface area will increase the chance of more molecules to evaporate.

How do you calculate the evaporation rate of water?

Calculate Evaporation Using Mathematical Equations. 1 E = Evaporation Rate (Gallons/Day) 2 A = Pool Surface Area (ft 2) 3 W = Wind Speed Above Pool (mph) 4 P = Water’s Vapor Pressure (mmHG) at Ambient Temperature. 5 T = Temperature (°F)

## How reliable is the lake evaporation model?

268 R. J. Granger and N. Hedstrom: Modelling hourly rates of evaporation from small lakes measurements alone ineffective in the parameterization of open water evaporation. Energy budget approaches, such as Morton’s (1983) com- plementary relationship lake evaporation model have not proven to be reliable for short-term applications.

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How do you measure evaporation in a swimming pool?

Direct Measurement of Evaporation. If you already have a pool, the easiest way to figure out how much water you are losing is to measure it directly. Measuring the evaporation rate is relatively simple. First begin by using a ruler or tape measure to measure the distance from the pool deck to the water’s surface.

### How much water does your pool lose due to evaporation?

One often overlooked issue is how much water you would expect to lose due to evaporation in any given year. Depending on where you live, an average-sized residential pool with a surface area of 400 square feet could lose as much as 10,000 gallons of water each year due to evaporation!