Water evaporation


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I have just established a new pond with fish, a lily and one other plant, all is good but I have noticed that the water level drops a little each day, its not a leak. I have topped up with tap water but the water quality is not good so what treatment can I add to keep the water clean whilst having to top up the water levels with tap water?
 
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sissy

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do you have city water as that will change the chemistry of the water .They add chemicals to city water to kill bacteria and that kills the good bacteria in the pond .With heat and humidity I can loose sometimes 6 inch's or more in my 5000 gallon pond a day and have to add well water .Humidity and heat suck water out of the pond along with splashing and what the plants use up
 
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Welcome @Maggie 25 ! We're happy you're here!

Generally the thing people are concerned about in city water is chlorine or chloramines - very common water treatment and harmful to fish in large quantities. There are products called dechlorinators that will remove the chlorine from the water and keep your fish safe.

Are there other things in your water you are concerned about?

Tell us more about your pond - how big, how many fish, what kind of filtration do you use, do you have aeration and/or a waterfall? Post some pictures - we love pictures!
 

herzausstahl

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Welcome @Maggie 25 ! We're happy you're here!

Generally the thing people are concerned about in city water is chlorine or chloramines - very common water treatment and harmful to fish in large quantities. There are products called dechlorinators that will remove the chlorine from the water and keep your fish safe.

Are there other things in your water you are concerned about?

Tell us more about your pond - how big, how many fish, what kind of filtration do you use, do you have aeration and/or a waterfall? Post some pictures - we love pictures!
I'll be honest I rarely use the decolonizators as I feel I have enough running water & add a small enough percentage vs the whole to worry about it. But it completely depends on your set up
 

sissy

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can also depend on the size of the fish and overstocking pond and feeding .I have people coming to day as no one told them about city water and for 4 years the fish they got all died .They have a nice pond and an automatic fill and Danville city water has a bad wrap as people cannot even stand to drink it .I wouldn't drink it .The couple are moving out to my area and I meant them out in the garden center and since they sold the other house and bought the new one on a well they want to start fresh .They took the other pond apart because new owners do not want it .As long as the cats do not kill the baby fish I will give them some .Once they get started .The hubby dug the new hole already
 
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I'll be honest I rarely use the decolonizators as I feel I have enough running water & add a small enough percentage vs the whole to worry about it.
Same here - I rarely add more than a few hundred gallons at a time - I figure it's less than 5% of my total pond volume - so I don't worry about it.
 
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Hard to buy evaporation at 6 inches. Our pond drops about 3/4 to 1 1/2 inches a day but I know there are a couple of leaks in our 4 waterfalls. Does someone know how estimate evaporation, maybe as a table of values based on
Square footage and water temperature at different humidity levels? It’s probably a calculus equation, but a set of tables would work.
 

sissy

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you would need to add in wind and splash factor and what plants absorb ,so really no factor that any one could figure out .Then you add in how much sun is on the pond during the day
 
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I remember Meyer Jordan sharing information about pan evaporation rates as well - but there are so many varying factors. Wind, splash, surface area, plants, rocks... We have a small patio pond that we used as a measuring stick of sorts. We know it doesn't leak, so when it needs two or three inches of water added it makes sense that the pond has lost that much water, too. Now our standard joke is "pond needs filling? Must be a leak!"

I think the best thing a pond owner can do is to observe and learn what is normal for YOUR pond.
 
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Mmathis

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I'll be honest I rarely use the decolonizators as I feel I have enough running water & add a small enough percentage vs the whole to worry about it. But it completely depends on your set up
I’m sure you meant to say “dechlorinator.” I always keep some on hand in case of an emergency! We have chlorine and chloramines in our water. When I add water, I spray it in so that the chlorine can dissipate, but the chloramines are still there.
 

sissy

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here nights were in the 50's for 4 days and days near or above 90 degrees and I lost over 8 inch's of water every 2 days .I would see a fog coming off the pond
 
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We use the 10 percent threshhold as our standard and have an auto fill system tied to our irrigation system which draws from a lake, so if the pond loses less than 10 percent a week, we include that volume in our water change at the end of the week. Could be a leak, water discarded during a filter flush, or could be evaporation but it doesn’t matter which if it’s all under 10 percent per week. But it would be useful to know approximately how much evaporation is occurring. Sounds like the math is too hard.
 
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Sounds like the math is too hard.
In general, yes. Math IS too hard. But I think in this case there are just too many variables to come up with a formula that works across the board. There are definitely evaporation rate tables, but how do you factor in a sunny pond vs a shady pond, or a splash waterfall vs a trickling stream. Or a pond full of plants vs one with few plants. Windy vs calm. High humidity vs low. Lots of factoring. And - math=hard.
 

addy1

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I am losing around 3-4 inches in 3 days in the hot tub pond. No waterfall, no pipe leaks just evaporation. The big pond I am adding water every day, a hour of input to refill. If I don't it drops by 6 plus inches in a few days. The bog, the plants, the surface area, the heat, I lose this much every summer. Never a leak.
Hard to buy evaporation at 6 inches.
 
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Hard to buy evaporation at 6 inches. Our pond drops about 3/4 to 1 1/2 inches a day but I know there are a couple of leaks in our 4 waterfalls. Does someone know how estimate evaporation, maybe as a table of values based on
Square footage and water temperature at different humidity levels? It’s probably a calculus equation, but a set of tables would work.
Don't buy it either, saying a pond can evaporate in one week if the pond is 42inch
 
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A lot of it depends on your waterfall. You would be amazed how just a tiny overflow can drop you water level significantly. I just redid my pond and I am not losing near as much water as I was with my old pond. I changed my waterfall to drop more directly into my basin rather than flowing from further away then dropping in my pond. I was losing about an inch to two everyday before i redid my pond. Now I only lose an average of a quarter inch. I even have more surface area. I would inspect my old pond and swear I didn't see where water was leaking out because it was slow but that slow leak over 24 hours adds up. Here are some pictures of my old waterfall and my new one. The old one dropped gradually and had more of a chance to spill off to the side where the new one drops straight off and has more area that is in the basin behind it.
 

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