Table 2 Parameters used for computing evaporation.

From: Sustainable application of edible solute to control reservoir evaporation loss

Name

Equations

KM

WS

RH

h

A

Td

pa

D

DTA

ew

ea

Pan evaporation

EL = 0.7*pan evaporation

X

X

X

X

X

X

X

X

X

X

X

Penman equation

\({E}_{o}=\frac{(700{T}_{M} )/\left(100-A\right)+15\left(T-{T}_{d}\right)}{\left(80-T\right)}\left(mm/day\right)\)

TM=T + 0.006 h

✔

X

X

X

✔

✔

✔

X

X

X

X

Meyer’s formula

EL = KM(ew − ea) x [1 + u9/16]

✔

✔

✔

✔

X

X

X

X

X

X

✔

Rohwer`s Formula

EL = 0.771 x (1.465 − 0.000732pa) x (0.44 + 0.0733uo) x(ew − ea)

✔

X

✔

✔

X

X

X

✔

X

X

✔

Blaney Criddle Equation

\({E}_{L}=\left(0.0173{T}_{a-}0.314\right) {T}_{a}\frac{D}{{D}_{TA}}25.4\)

✔

X

X

X

X

X

X

X

✔

✔

X

  1. EL or Eo = Lake evaporation, WS = Wind Speed, RH = Relative Humidity, h = Elevation of water surface area with respect to mean sea level in (m), A = Latitude, Td = Mean dew point of the atmosphere, ew = Saturation vapor pressure, ea = Actual vapor pressure, pa = Mean barometric pressure, D = Hours of daylight, DTA = Total annual daylight hours, KM =Coefficient, u9 = mean wind speed at 9 m height from ground (Km/h), T = Monthly average atmospheric temperature.
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