A reservoir is being planned for Albuquerque, NM. The design evaporation is set as the critical period of July. Compute evaporation depth during July using the Penman method. The net radiation is 361 ly/day with a pressure of 838 mb. Max Temperature: 92°F Max Wind Speed: 7.3 mph Relative Humidity: 31%

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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Hydrology Problem:

A reservoir is being planned for Albuquerque, NM. The design evaporation is set as the critical period of July. Compute evaporation depth during July using the Penman method. The net radiation is 361 ly/day with a pressure of 838 mb.
Max Temperature: 92°F
Max Wind Speed: 7.3 mph
Relative Humidity: 31%

Use the equation(s) to guide you:

ст
E
pL.
Ea
A+ Y
Qn +
day
pis the density of water (mass/volume) = 1 g/cm?
Le is the latent heat of vaporization evaluated at the temperature of the air (energy/mass)
Le = 597.3 – 0.57* T (°C)
Q, is the net radiation absorbed (energy/area-time)
E, is the "drying power of the air" as an energy flux (energy/area-time)
E, = pLe (a + bu)(e, – ea)
a + bu is empirical transfer constants in length per pressure time
e, is the saturation vapor pressure at temperature in the air (pressure)
4278.6
e. = 2.7489 * 10° x exp (- T+242.79,
e, is the actual vapor pressure in air based on relative humidity
ea = RH x es
y is the psychometric constant (pressure/temp)
0.66 * P
mb
Y =
=
1000
A is the slope of the saturated vapor pressure over time (pressure/temp)
2.7489 * 108 × 4278.6
-exp
mb
de,
A=
dT
4278.6
p(-
(T + 242.79)2
T + 242.79,
Transcribed Image Text:ст E pL. Ea A+ Y Qn + day pis the density of water (mass/volume) = 1 g/cm? Le is the latent heat of vaporization evaluated at the temperature of the air (energy/mass) Le = 597.3 – 0.57* T (°C) Q, is the net radiation absorbed (energy/area-time) E, is the "drying power of the air" as an energy flux (energy/area-time) E, = pLe (a + bu)(e, – ea) a + bu is empirical transfer constants in length per pressure time e, is the saturation vapor pressure at temperature in the air (pressure) 4278.6 e. = 2.7489 * 10° x exp (- T+242.79, e, is the actual vapor pressure in air based on relative humidity ea = RH x es y is the psychometric constant (pressure/temp) 0.66 * P mb Y = = 1000 A is the slope of the saturated vapor pressure over time (pressure/temp) 2.7489 * 108 × 4278.6 -exp mb de, A= dT 4278.6 p(- (T + 242.79)2 T + 242.79,
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