Help - Pond is too Shallow


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Hi everyone. I am really hoping to get some good advice from this group. Building my Koi pond took a great deal of effort. I got hung up on many different stages of the design I couldn’t find a great step-by-step guide or a good book. Eventually I pieced together the pond you see in the pictures. Eventually I added a pressurized filter and added koi. Everything seemed great for the first two months, last June and July.
The koi we’re doing well, then in August a Herron found the pond and began destroying all of the koi because it’s only 3 1/2 feet deep in the dead center. The remainder of the pond is only about 18 inches deep. I know now this is not deep enough.

I wonder if it would be possible for me to cut the liner about 12 inches in from the edges and then 12 inches out from the edge drop down from the 18 inches to 3 feet. Would I be able to join a piece of liner? I have attached some pictures and a video so you guys could take a look.

any advice is appreciated.
 

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Mmathis

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Hello and welcome!

Sorry, but I can’t give you any advice for enlarging and piecing a liner. Personally, just from what I’ve read about it, it’s not something I ever want to try. But it can be done.

How big is your pond? It looks small for koi.
 

brokensword

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if you put up a net, you don't need to make the pond larger. Even if you don't like the look, you can make it removeable when you're enjoying the pond and put it back when you're not there.
 

j.w

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@Wetlands09
I use a net over my pond up high on posts so I can walk under it to get in if need be. It also hangs down the sides and I connect it to a short wire fence so critters can't get under it or through it. It is now as good as Fort Knox! It won't matter how deep your pond is for a heron. He/she will just walk up to the edge and wait forever till a fish comes to the surface and then jabs it. The bird has the patience of Job in the Bible,lol!
 
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Hi thank you, it’s 10x10 total
How many gallons of water? I agree that your pond looks a bit small for koi. Sadly, if you have a heron problem, the only sure-fire way to keep your fish safe is to net the entire pond. You can create caves & other hiding spots for the fish, but (as j.w put it) those birds have the patience of Job & will return to an easy hunting source until it's fished out.
 
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It's you. but A simple answer is netting and or fishing line crossed over the pond. The only way to insure herons can't get your fish is to have pond banks over 30 inches higher then the water level. And no shallows less the 24"
Cover the pond with a net/
A dog
 
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I’m reading that the minimum size for a koi pond should be 6x8x4, https://fishkeepingforever.com/minimum-pond-size-for-koi/ which confirms that the pond is too small for koi and if I want to have koi I will need to start over and make the entire pond four feet deep. UGH!
Well, yes & no. While there are a lot of opinions on the optimal (necessary) depth of a pond to keep koi, the main problem is lack of total water volume & the necessary filtration to keep up with a heavy waste load. Honestly, a 6 X 8 foot pond would be inappropriate for full grown koi (IMO) no matter how deep it is, because how in the world can a 3' fish comfortable swim when they're half the diameter of the pond? Personally, I'd go shallower (2 - 3') but with WAY more surface/swimming area. You do need at least 1000 gallons for your first koi, though, and around 500 additional gallons for each additional one (give or take)
 
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So my pond is 10x10. Is the general consensus that if I were to take it all apart and start over and dug it to a depth of 3-4 feet it would ok for 3-4 koi? Anyone recommend any books or step by step guides for me to follow?

thanks everyone
 
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brokensword

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It's you. but A simple answer is netting and or fishing line crossed over the pond. The only way to insure herons can't get your fish is to have pond banks over 30 inches higher then the water level. And no shallows less the 24"
Cover the pond with a net/
A dog
don't forget you can also use a stool and a .22
 

brokensword

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So my pond is 10x10. Is the general consensus that if I were to take it all apart and start over and dug it to a depth of 3-4 feet it would ok for 3-4 koi? Anyone recommend any books or step by step guides for me to follow?

thanks everyone
if you can incorporate a bog to filter your water, you'll be much more able to enjoy koi in that size pond. Search for threads here and see if the idea interests you.
 
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It's not an easy task to join two liners. You need the proper kit for the type of liner material. The area has to be dry and hospital clean. You have to be careful you aren't stretching the material as you do it.

If I read it right, your koi are all gone.
If you don't want to dig another larger pond, it's the perfect time to restock with shubunkin instead of koi. Shubunkin are beautiful fish in the goldfish family. Colorful with long flowing fins. They don't get huge or excrete a tremendous amount of waste like koi do.
There are many other types of goldfish that are nice looking too. I have a few that have really nice flowing fins.

Unfortunately, a lot of people want a "koi pond", not realizing the enormous needs that koi require.
A lot of us found this out the hard way. Our cool little koi turn into huge 3 foot monsters with tremendous girth. Our filters suddenly can't handle the tremendous waste they produce, so our water quality suffers.

It's not the fault of new comers into the hobby, it's the way koi are presented in society, for lack of a better word. It's almost like the word koi is synonymous to garden ponding.
 
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It's not an easy task to join two liners. You need the proper kit for the type of liner material. The area has to be dry and hospital clean. You have to be careful you aren't stretching the material as you do it.
While i agree it's not easy to seam LARGE LONG joint In the field on an existing pond, that can be very tricky and require so patience and skill, Seaming a shorter seam is not that hard. I have taught many in past years how to seam on roofs and very rarely have they needed constant oversight. Its the wrinkles that make it hard to seam.
 
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That is probably the same number for aquascapes ponds

I bet that's spot on accurate.

And here's the thing - while a deeper pond ALLOWS for the fish to go deeper when there's a heron or other predator, there's no guarantee that they WILL. If that were the case, these birds would never catch a single fish in the wild or in a garden pond. Fish can have very short attention spans and herons are very VERY skilled hunters who are incredibly patient. We have scads of green and great blue herons as well as snowy egrets near our house - they fly over constantly. I've seen them stand in one spot in the natural ponds in our neighborhood for hours, just waiting. They wait for the fish to forget they are there and then they strike. They will also do tricky things like regurgitate on the water so the fish think someone or something dropped food for them and up they come, only to be stabbed and possibly eaten. I say possibly, because they don't eat everything they catch... some fish are too big and just get tossed aside. I've also read that once a heron spots a location where fish are present, they mark it with some form of bird GPS and never ever forget where that spot was. They will continue checking that spot as long as it takes to finally get those fish.

So dig deeper if that's your desire, but don't assume you will outsmart the heron that way.
 

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