Evaporation and heat loss of your pond

[Gordo33]

79 degrees F

 

[MitchM]

Nope
This the line that is confusing me: Wp=.097+(.285x-.034)x899
Why is your result for (Pw-Pa) - .034 multiplied with the velocity result .285 before adding 0.97 to .285 as shown in the formula (0.97 + .038v). It's been a long time since I have had to deal with math formulas but I thought you complete the work inside each bracket before performing the other functions.

I thought it should be
(.097+.285) x (-.034) x 899
(.382)x(-.034) x 899

I was trying to figure out my ponds evaporation rate and ended with a negative number as I would using your numbers as discribed above.
Straighten me out what am I missing here?

My ponds numbers are
Air temp 92 f
Wind velocity 7 mph
Pond is 200 sf

Thanks

Sorry Gordo33, I got tied up with work.
I believe if you come up with a negative number from the Pw-Pa equation, at that point in time there is no evaporation occurring.
Once the air temperature drops down below 80F, you will have a positive number and evaporation will start to occur with a water temperature of 79F.

I may have made a mistake with my original calculations, I'll have to go over them again. Thanks for pointing that out.

 

[RichardSJPonds]

Wow, some really good technical info in this thread! Thanks for sharing.
Last year I put together some info to help people with ponds get thru the summer heat without incident, looks like I've got some details to add!

http://www.landvistaaquascapes.com/...m-pond-healthy-through-the-dog-days-of-summer

 

[Meyer Jordan]

Wow, some really good technical info in this thread! Thanks for sharing.
Last year I put together some info to help people with ponds get thru the summer heat without incident, looks like I've got some details to add!

http://www.landvistaaquascapes.com/...m-pond-healthy-through-the-dog-days-of-summer

Yikes, an iongen advocate!

 

[MitchM]

uh-oh....

 

[RichardSJPonds]

Yikes, an iongen advocate!

TBH, we don't include IonGens in our regular ecosystem ponds, too easy for people to overdose the copper and kill everything. They're more like a last resort when gentler treatments aren't doing the trick. There are ponds that do well with one, they tend to be larger ponds with a recurring pea soup water problem.

 

[Meyer Jordan]

They're more like a last resort when gentler treatments aren't doing the trick.

Sadly, this is the prevailing mind-set of this hobby...that Pond Treatments are necessary, completely normal and.....safe. A belief that is easily dispelled with a little patience and prudent husbandry. Work with a pond, not against it!

 

[Mike in Vermont]

I don't have a liner. The bank will absorb water. Quite a bit if it's real dry.