I NEED A QUESTION ANSWERED......... - The Firearms Forum

rooter · 05-27-2010, 04:05 PM

I THINK THERE ARE SUPER INTELLIGENT MEMBERS HEREON AND I WANT TO POSE A SERIOUS QUESTION THAT GOES BEYOND MY REASONING IT THRU....I HAVE AN IN-GROUND SWIMMING POOL THAT I THINK WAS OFF-HANDEDLY DESCRIBED AS A 25K. GALLON DIVING POOL... NEARBY I HAVE A DECORATIVE BIRD-BATH TYPE THING THAT PROBABLY HOLDS ABOUT 100 GALLONS....I'M MARVELLING AT HOW RAPID THE EVAPORATION IS AND WAS PONDERING A CORRELEATION OF SORTS...I AM ALARMED AT THE EVAPORATION ON THE POOL AND HOW OFTEN I MUST ADD WATER WITH THE GARDEN HOSE...
QUESTION:
IF BOTH OF THE WATER SURFACES ARE EXPOSED TO THE SAME AMBIENT RELATIVE HUMIDITY, DEW POINT, ATMOSPHERIC PRESSURE, AND MODERATING AMBIENT TEMPERATURES, IS THE WATER LEVEL REDUCTION THE SAME IN BOTH CONTAINERS, TO WIT, 1" DOWN IN THE SWIMMING POOL AND 1" DOWN IN THE BIRD-BATH? I LIVE NEAR THE COLLEGE HERE AND MANY OF MY FRIENDS ARE PROFESSORS OVER THERE...SOME THINK IT'S A TRICK QUESTION AND I ASSURE THEM IT IS NOT..SOME PEER AT ME OVER THE TOP OF THEIR HORNED-RIMS AND OTHERS RAPIDLY CHANGE THE SUBJECT OF HOW COLD THE POOL WATER STILL IS..I'VE ABOUT GIVEN UP..SOMEONE RECENTLY MENTIONED RATIO AND PROPORTION AND I THOUGHT THEY WERE TALKING ABOUT A SHAPELY FEMININE STRUCTURE!!!!! Chief

USMCSpeedy · 05-27-2010, 04:10 PM

I would think that the relative water temperature for both would be a factor as well. If one is colder that the other it should, in theory, evaporate at a slower rate than the other as it would take more energy, ie heat, to vaporize it.

new308handloader · 05-27-2010, 04:32 PM

The rate of evaporation in this case has to do with two things:

1) The surface area of liquid exposed to air....the pool will evaporate much more water than the birdbath because of the larger surface area.....however, a 1" drop in the pool is quite a bit more water than 1" in the birdbath

2) The type of liquid.....although both contain water, the pool has added chemicals....and the birdbath probably has nitrates (from bird poopie)....so neither sets of "water" will evaporate at the same rate if they were in a container with the same surface area.

my 2 cents

todd51 · 05-27-2010, 04:47 PM

The quick answer to your question is no. The reason can get a little involved. A fast read of why can be found here:

http://en.wikipedia.org/wiki/Evaporation

rooter · 05-28-2010, 08:09 PM

Thank you all for the response to my long term quest to get this 'problem' answered....Many swimming pools have self regulating water levels so those folks don't realize how much water they add during the low humidity, hot weather...Of course, being retired and all, I got so much spare time on my hands, gotta fret about minor stuff!!!! Chief

Gun Geezer · 05-29-2010, 09:39 PM

I live in central Florida. While it doesn't get as dry here as it does in AZ., we share the same problem with our pool and large fountain. We are now entering our rainy season which means about 1-2 inches of rain nearly every afternoon so the problem goes away. Otherwise, the pool ( approx. 17K gal. ) drops approx. 1-2"'s per week without an equal amount of rainfall. The fountain water level drops at a much faster rate and in the absence of significant rain, runs dry. My solution has been to install an automatic water level maintainer on the pool and installed a dedicated garden hose within a few feet of the fountain and taught my wife the finer points of refilling the fountain. Higher math will not refill either one. The answer is add water to both or wait 'til it rains. Problem solved.

05-27-2010, 04:05 PM	#1
rooter VMBB Senior Chief Of Staff Join Date: Jan 2001 Location: Marty Robbins old hometown, Glendale Arizona--a suburb of Phoenix. Contributor Posts: 9,273	I NEED A QUESTION ANSWERED......... I THINK THERE ARE SUPER INTELLIGENT MEMBERS HEREON AND I WANT TO POSE A SERIOUS QUESTION THAT GOES BEYOND MY REASONING IT THRU....I HAVE AN IN-GROUND SWIMMING POOL THAT I THINK WAS OFF-HANDEDLY DESCRIBED AS A 25K. GALLON DIVING POOL... NEARBY I HAVE A DECORATIVE BIRD-BATH TYPE THING THAT PROBABLY HOLDS ABOUT 100 GALLONS....I'M MARVELLING AT HOW RAPID THE EVAPORATION IS AND WAS PONDERING A CORRELEATION OF SORTS...I AM ALARMED AT THE EVAPORATION ON THE POOL AND HOW OFTEN I MUST ADD WATER WITH THE GARDEN HOSE... QUESTION: IF BOTH OF THE WATER SURFACES ARE EXPOSED TO THE SAME AMBIENT RELATIVE HUMIDITY, DEW POINT, ATMOSPHERIC PRESSURE, AND MODERATING AMBIENT TEMPERATURES, IS THE WATER LEVEL REDUCTION THE SAME IN BOTH CONTAINERS, TO WIT, 1" DOWN IN THE SWIMMING POOL AND 1" DOWN IN THE BIRD-BATH? I LIVE NEAR THE COLLEGE HERE AND MANY OF MY FRIENDS ARE PROFESSORS OVER THERE...SOME THINK IT'S A TRICK QUESTION AND I ASSURE THEM IT IS NOT..SOME PEER AT ME OVER THE TOP OF THEIR HORNED-RIMS AND OTHERS RAPIDLY CHANGE THE SUBJECT OF HOW COLD THE POOL WATER STILL IS..I'VE ABOUT GIVEN UP..SOMEONE RECENTLY MENTIONED RATIO AND PROPORTION AND I THOUGHT THEY WERE TALKING ABOUT A SHAPELY FEMININE STRUCTURE!!!!! Chief __________________ -->

05-27-2010, 04:10 PM	#2
USMCSpeedy Senior Member Join Date: Jan 2009 Location: Minnesota Posts: 627	Re: I NEED A QUESTION ANSWERED......... I would think that the relative water temperature for both would be a factor as well. If one is colder that the other it should, in theory, evaporate at a slower rate than the other as it would take more energy, ie heat, to vaporize it. __________________ If all else fails, VOTE FROM THE ROOFTOPS Trying to reform a liberal is like trying to pick up a turd from the clean end. What this country needs is more family trees that will produce more lumber and fewer nuts!

05-27-2010, 04:32 PM	#3
new308handloader Senior Member Join Date: Jan 2009 Location: Maryville, TN Posts: 535	Re: I NEED A QUESTION ANSWERED......... The rate of evaporation in this case has to do with two things: 1) The surface area of liquid exposed to air....the pool will evaporate much more water than the birdbath because of the larger surface area.....however, a 1" drop in the pool is quite a bit more water than 1" in the birdbath 2) The type of liquid.....although both contain water, the pool has added chemicals....and the birdbath probably has nitrates (from bird poopie)....so neither sets of "water" will evaporate at the same rate if they were in a container with the same surface area. my 2 cents __________________ "History does not long entrust the care of freedom to the weak or the timid." D. D. Eisenhower

05-27-2010, 04:47 PM	#4
todd51 Advanced Senior Member Join Date: Mar 2009 Location: Central, Ohio Contributor Posts: 2,575	Re: I NEED A QUESTION ANSWERED......... The quick answer to your question is no. The reason can get a little involved. A fast read of why can be found here: http://en.wikipedia.org/wiki/Evaporation __________________ Retired Praefectus Vigilum NRA Endowment Member

05-28-2010, 08:09 PM	#5
rooter VMBB Senior Chief Of Staff Join Date: Jan 2001 Location: Marty Robbins old hometown, Glendale Arizona--a suburb of Phoenix. Contributor Posts: 9,273	Re: I NEED A QUESTION ANSWERED......... Thank you all for the response to my long term quest to get this 'problem' answered....Many swimming pools have self regulating water levels so those folks don't realize how much water they add during the low humidity, hot weather...Of course, being retired and all, I got so much spare time on my hands, gotta fret about minor stuff!!!! Chief __________________

05-29-2010, 09:39 PM	#6
Gun Geezer Advanced Senior Member Join Date: Oct 2009 Location: Central Florida Posts: 1,710	Re: I NEED A QUESTION ANSWERED......... I live in central Florida. While it doesn't get as dry here as it does in AZ., we share the same problem with our pool and large fountain. We are now entering our rainy season which means about 1-2 inches of rain nearly every afternoon so the problem goes away. Otherwise, the pool ( approx. 17K gal. ) drops approx. 1-2"'s per week without an equal amount of rainfall. The fountain water level drops at a much faster rate and in the absence of significant rain, runs dry. My solution has been to install an automatic water level maintainer on the pool and installed a dedicated garden hose within a few feet of the fountain and taught my wife the finer points of refilling the fountain. Higher math will not refill either one. The answer is add water to both or wait 'til it rains. Problem solved.