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  1. #1

    Pond build advice.

    Hi all I'm new to the forum and been having a good read. I'm about to undertake a pond build and just wanted to see of my plans would work. The pond will be approx 10ftx5ftx5ft. I was building up 3 concrete blocks and the rest dug down. I was going to put a 6" base in(its clay ground) then some footing for the wall to have half a block below ground level with a collar around that. I will also be rendering the inner wall to give strength and maybe the outer if needed? I would be building a wooden frame to go around the pond and then paneling it. The pond will be using a pond liner. Also should I build the wall first or dig down and do the base?I'm no expert and this will be a diy project to keep me busy over the coming weeks. Thanks in advance for any help



  2. #2
    Senior Member Rank = Yonsai bicolormoth's Avatar
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    that's just 1500 gallans, at best. why have you decided on such a small pond ? is it lack of space or budget, or both ?

  3. #3
    I could go longer but 5ft width is all I have. So basically it is decided by space with a hint of keeping it as cheap as possible. Would that size pond be considered small?

  4. #4
    Senior Member Rank = Yonsai bicolormoth's Avatar
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    i would plan for the largest size you could possibly make, , work out the cost, then see if that falls within your budget. depth is ok at 4ft+, so the nearer you can get to 2000 gallons the better, 3000 would be much better.

  5. #5
    I could maybe go to 11x5.5ft and maybe go to 5.5ft depth. That will take me up and over 2000 gallons I think.

  6. #6
    Senior Member Rank = Mature Champion RoyLittle0's Avatar
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    Quote Originally Posted by Dom3454 View Post
    I could maybe go to 11x5.5ft and maybe go to 5.5ft depth. That will take me up and over 2000 gallons I think.
    Hi and welcome to the forum, Iím not 100% sure on you plans, if you are building a concrete base then I assume you would build the blocks up to finished height, so not sure what the collar is for?

    No need to render the walls, it wonít add anything to the strength, you would be better lining the blocks with 25mm insulation board.

    Donít forget you add the water volume of the filtration to the pond to get the total volume of the pond, always better to go deeper if you can.


    Sent from my iPhone using Tapatalk
    4600 Gallon Concrete Block and Fiberglass
    2100 mm x 710 mm Infinity Window 32mm thick
    2 x Aerated Bottom Drains and Skimmer
    Filtreau HiFlow 30 Drum Filter
    Bio Chamber - 140 litres K1
    Bakki Shower - 30 KG Sakura Far Infrared Media
    2 x 18,000 lh pumps
    Idealseal MS290

    My Pond Build

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  8. #7
    Hi and thanks for answering. The concrete base was purely for the weight at the bottom do you think I wont need a concrete base with me using a pond liner? I'll scrap rendering the walls and look into the boards. I was planning on using concrete blocks from the floor up so that's why I was going to put a collar around it. Thanks for any help

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  10. #8
    Extreme Koi Member Rank = Nanasai NickK-UK's Avatar
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    10x5x5 feet is 3x1.5x1.5m hence we're looking at 3x1.5x1.5=6.75 or 6,750 litres.

    I have a 1.5m wide pond at the moment - it's also ~2.5m long but is v shaped depth of 70cm. So I can give you lots of advise on this from bitter experience! I have 4 koi and 7 green tench.

    The fish seem happy enough but they're getting big. With lilly plants etc they start feeling a little cramped in. This was the pond we inherited, pond 2.0 will be over 11,900 litres.

    I've tried cheap filters:
    * it came with a 4500l sized pressure filter and 2500l pump - the algae and problems were bad.
    * moved to a 9000l sized pressure filter and a 6,000l pump - the algae wasn't as bad but I also added denitrifying plants (lilies, iris, watercress, stink cabbage etc).

    It was never really 'clean' and the water was always a little murky - currently the pond is running a drum and bio large enough for the new pond.. one of the best decisions is to go with a variable pump. Although capable of 20,000 lph (190watts) it's currently running between 4-6,000lph (20-40 watts).

    If you can have a look at airlifts. They're more power efficient but need some planning.

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  12. #9
    Hi, thanks for the advice I recently picked up a filter and pump 2nd hand. It is rated for 30000l so If I'm not mistaken that should be fine for a koi pond of 12500l. I dont mind upgrading that in a years time if not. Koi and tench is also what I am planning.

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  14. #10
    Anybody got anymore advice on the concrete base and also using footings and building up from ground level instead of from the base?

  15. #11
    Extreme Koi Member Rank = Kyusai Pomster's Avatar
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    Concrete collar ground level approx 300mm wide, definately a bottom drain and I would'nt bother with a concrete base if it's clay. Dont cheap on the liner and underlay, if you can get a box liner even better
    Do you have a high water table?
    10x5x5 =
    10x5x5 =250
    250x6.25 = 1,562Gal

    As already said if possible to go longer it would be preferred but not essential
    Not to read a newspaper makes you uninformed. But to read a newspaper makes you misinformed

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  17. #12
    The ďbestĒ general opinion on koi pond construction would be a concrete base/bottom drain/full block construction with a fibreglass finish,obviously budget and time doesnít always allow for this so you may have to sacrifice certain things to fit budget etc,Have a think of which things are necessary and which you could do without.Id personally say concrete base/bottom drain is a must if I ever built another pond

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  19. #13
    From what I have learnt, bottom drain is a must, they can still be installed without a concrete base.
    Jay

    Sent from my CLT-L09 using Tapatalk

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  21. #14
    I will look more into a bottom drain. Can these be fitted with pond liner? Still unsure on the concrete base as some say its needed and others dont. That was the outcome of my reading also. I dont have a high water table. I will certainly be adding atleast another foot in length to my build if not a little more. Another question on the bottom drain and the thing that was putting me off was how does the piping from it work if the pond is below ground? Or does it run along the bottom of the pond and then up and over the wall? Thanks for all this help guys. Wanting to get this started but want to make sure it's right. As for budget I dont really have a set amount just dont want it to get expensive. I currently run a 6ft marine aquarium worth 1000s so didnt want another money killer lol

  22. #15
    Member Rank = Sansai Spongebob's Avatar
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    Quote Originally Posted by Dom3454 View Post
    I will look more into a bottom drain. Can these be fitted with pond liner? Still unsure on the concrete base as some say its needed and others dont. That was the outcome of my reading also. I dont have a high water table. I will certainly be adding atleast another foot in length to my build if not a little more. Another question on the bottom drain and the thing that was putting me off was how does the piping from it work if the pond is below ground? Or does it run along the bottom of the pond and then up and over the wall? Thanks for all this help guys. Wanting to get this started but want to make sure it's right. As for budget I dont really have a set amount just dont want it to get expensive. I currently run a 6ft marine aquarium worth 1000s so didnt want another money killer lol
    Simplicity is always the key, skimp and you’ll have big problems that you will 100% regret later. No problem using a bottom drain with a liner. The bottom drain should be simple, ie one length of pipe from the bottom drain to one bend up to your filter. This would go out under your pond.

    My current project started with a liner (which I still need to take back ) no way would I have used a concrete base for that, presuming the shape is simple and your on clay I’d go the sleeper route. Just imagine a big shaped box, with a box welded liner. Basically if you’re going to put a concrete base in you may as well then block and fibreglass it.

  23. #16
    Having kept a marine aquarium too, I can say with honesty that a pond....is another money pit!
    Jay

    Sent from my CLT-L09 using Tapatalk

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  25. #17
    I will be using a bottom drain. Would a concrete base be more advised with this or should I just dig it in? Any advice on what bottom drains to be looking at?

  26. #18
    Also looking at using sleepers now also as that would give me the wood finish I want and would be far easier to build. It's got me thinking

  27. #19
    If I was building with a liner, concrete collar at ground level then building up from that and digging down, I wouldn't be putting a concrete base down, but I'm no expert mate.
    Jay

    Sent from my CLT-L09 using Tapatalk

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  29. #20
    I started my pond build back in April 2018 and only just put the fish in last month! The Pond is only approx 1000 Gallons (4000 litres) so yes, it's tiny compared to a ' standard' Koi Pond. I am restricted to mainly space and budget too, but I am happy with my build considering my lack of knowledge and DIY skills. Joining the forum for advice and tips helped tremendously in the process of the build, and I am still asking questions...

    I am limited to the number of Koi I can have in my Pond (currently 4 fish approx 8 inches), but I think if I keep on top of the filtration and feeding, perhaps I can introduce couple more small gold fish?On hindsight, I could have increase my pond dimension by 20%. So yes, if you can go bigger do it now. Good luck with the build!


    My Pond Build
    https://www.koiforum.uk/pond-construction-pond-build-diaries/22697-build-diary-4-000ltr-raised-blockwork.html

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