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PAN evaporation vs Pond Evaporation rate?
#536462 06/12/21 08:46 PM
Joined: Jun 2020
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My county in Ky average PAN evaporation
Per University of Kentucky weather center evaporation average rate In June is 6.77 inches equals .225 per day http://weather.uky.edu/panevap.html
My understanding that a pond will generally be at least double the Pan evaporation rate in a average pond due to not being in a completely controlled environment. Due to Wind, wicking and vegetation consuming water.
Anyone have any additional data or can confirm that this is the case?
Articles you recommend?
Information i I have found that Shallow ponds will evaporate faster than deep ponds because the water warms up all of the way down. A pond that starts the summer 2 feet deep will go dry before a pond that is 10 feet deep evaporates 2 feet of water. Ponds that are deep enough will have a thermocline that stays cold. This buffers against heating by the sun. Even without a thermocline the water that the sun doesn't reach very well will stay cooler. A lot of shade also helps.
A pond with more shallow areas will evaporate at a faster rate than a pond that averages more depth.
I know wind and vegetation close plays a role also.

Re: PAN evaporation vs Pond Evaporation rate?
Kyscentlok #536465 06/12/21 10:10 PM
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Will a pond covered with filamentous algae and weeds evaporate at a faster or slower rate than one that has no weeds or algae?


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Re: PAN evaporation vs Pond Evaporation rate?
esshup #536474 06/13/21 11:18 AM
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Don't know about algae, but I do know the floating water hyacinth increases water temps & doubles evaporation.


8ac, full 3/16. CNBG, RES, FHM 10/15; TP 5/16; FLMB 6/16. 100 12" NLMB & 1k GSH 10/17,L, 150# TP & 70 HSB 5/18. 1k PK 11/18. 100# TP 4/19, 200# RBT 12/19, 10k TFS 3/20, 100#TP 5/20, 25 HSB & 250 F1 9/20,L,180# RBT 12/20, 206, 7k TFS,100#TP 5/21, 225



Re: PAN evaporation vs Pond Evaporation rate?
Kyscentlok #536563 06/15/21 03:49 PM
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In addition the large open areas of the surface of a pond invites better airflow, and waves increase surface area. Both of these will further increase evaporation rates.

The largest impact is dewpoints. Dry air will obviously increase evaporation far more than just warm/hot temperatures.

For instance if your dewpoint is 75 degrees, and the water temp is 75 degrees, it can be windy all it wants, and nothing will happen. No evaporation.

If the water temp is 50 degrees, and the dewpoint is 75 degrees, you will GAIN water via condensation. The water will warm very quickly near the surface to the dewpoint as condensation releases quite a bit of latent heat.

But if the dewpoint is 50 degrees, and the water is 80 degrees, your water will evaporate quite quickly as well as chilling below the air temp. It may be 90, but the water will go down in temperature due to evaporative cooling.


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