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  1. #1

    36000tr/8000Gal new Pond

    Hi all,
    We have finally broken ground on our new Koi pond, it going to be 6x 4x 1.5M formal pond half in half out ground with 2x 1.8x0.6M 'infinity' windows.

    We have dug down and down and still on horribly loose gravel/sand- I guess we have to stop somewhere so all we can think of is to double up on the bottom slab thickness to 250mm ??.
    we are planning on a double skinned block with concrete filled cavity below ground then a brick outer above ground.

    So far I have 3x Spindrifter BD's- but still need decide on Qty and Spec of Air pumps- any recommendations welcome

    I haven't yet purchased the Skimmer but was thinking of Certakin or similar modified for 110mmGravity- again recommendations welcome.
    Large Drum Filter (possibly Burton TF700), matched moving bed bio stage, and a Bakki Shower sat on a Veg Filter (Approx 20% of pond Surface area)

    In our last house we haa a mid sized liner pond with a home made filtration system from old 200L orange juice barrels- so this is quite a step up for us, but this is going to be our forever house, so I guess do it once and hopefully properly.
    I know there are many ways to achieve very similar results, and most ponds are probably well over engineered, but I welcome any constructive comments, and we are in Hythe, Southampton if there are any locals here that want to swing by a have a nosey.

    Cheers All,
    Steve H




    IMG_4746.jpg 2018-04-21 13.40.04.jpg


    Attached Files Attached Files

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  3. #2
    Senior Member Rank = Supreme Champion RS2OOO's Avatar
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    This looks like its going to be interesting.

    Never seen soil that looks like that before! Total opposite to me - Took a Week to get 2 tonnes of soil/clay/stone out of my filter pit hole to reach the bottom drain, and it was so compacted I had to use pick axes to break it up. When it came to filling it back up only a quarter of a tonne would go back in even though I was compacting it every few inches!

  4. #3
    Yes and I might be talking complete crap but it looks just like a shingle beach, but we are less than a mile from Southampton water so maybe it was underwater many moons ago.
    We are not sure how thick to make the base to compensate, was thinking 200-250mm but that’s nearly 8m3 of concrete just for the slab, at least it’s a full truck load if we go that route.

    Cheers for the interest, have you got pics up of your build? I will take a look in a bit

  5. #4
    Quote Originally Posted by Forest Way View Post
    Yes and I might be talking complete crap but it looks just like a shingle beach, but we are less than a mile from Southampton water so maybe it was underwater many moons ago.
    We are not sure how thick to make the base to compensate, was thinking 200-250mm but that’s nearly 8m3 of concrete just for the slab, at least it’s a full truck load if we go that route.

    Cheers for the interest, have you got pics up of your build? I will take a look in a bit
    The way I see it is this, how heavy do you think the walls of your house are?
    Let’s say for the sake of argument, 10 tonnes per linear meter. They’re going to be 0.35m thick, probably sitting on a unreinforced footing that’s 0.3m thick. A considerably heavier “point load”
    A 2m deep ponds water will weigh 2000kg/m2, or 2kg/cm2 which is naff all.
    A garage floor slab will generally be around 100mm thick with some mesh, in mine, i could park my Landrover Discovery which weighs nearly 4000kg/4 tyres which cover an area of what, 10cm2, it wouldn’t break the garage floor.
    It’s been 40 years since I did any structural engineering calcs but anything more than 150mm with some cheap mesh in should be more than satisfactory unless your ground is particularly rubbish imho.
    I’m drawing massive swimming pools at the moment and they’re being constructed of 200mm reinforced concrete but then they’re 3m deep, 15m long and 5m wide.
    However, it’s up to the individual to be comfortable with what they do at the end of the day
    I’ll let you all know if my 4-5” meshed slab cracks when I fill it up with water lol
    (Mesh is cheap so I’d put some in regardless, “garage mesh” is the stuff)
    concrete is very strong in compression but rubbish in tension. Mesh will help keep the slab thickness to a minimum.
    Same with blocks, why we seem to use 7N blocks when they’re never likely to be compressed to that extent is beyond me. It’s the mortar joint that’s the weak spot.


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  7. #5
    Moderator Rank = Supreme Champion Feline's Avatar
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    Looks like an exciting project, will be interesting to watch it take shape!
    If I had soil like yours I would have a chat with local builders- how far down do they need to go to get to something solid when they are puting in foundations?
    Loose soil like that could wash away leaving cavities below the slab if the ground water got high, so I think needs some special consideration. Note- I am not a structural engineer though.

    Be a little careful about following general house building principals when youre deciding on things for a pond. During construction the weight is all on the outer edges of the slab, but when filled will obviously be very even across it. But the point of most pressure is mostly outwards at the bottom of the walls- so the weight of the blocks you use in the walls does matter. House walls do not have large outwards pressure.

    The other thing that you need to consider is that your slab will effectively have 3 big holes in it with 4” pipes running through it which will create a significant weakness. You therefore cannot rely on it being as strong as a garage floor with the same thickness.

    I decided I wanted my drains and pipework fully encased in a good layer of concrete, with rebar. That meant going for 10” thick concrete. It made very little difference to the cost of the build anyway since the concrete itself was one of the cheaper items on the shopping list! No way would I have wanted to have saved £200 at the cost of peace of mind on the slab. Youre never going to dig it up again if you get it right first time anyway

  8. #6
    Thought I'd better say 'Hi' as I'm also in hythe

  9. #7
    Hi,
    when there’s more to see than a huge hole in the ground you will have to swing by and take a look, what’s your set up?
    We have been so busy with with the house renovation and now the pond that we haven’t thought about where to get the fish.....Are there any good dealers locally?

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  11. #8
    I've only got a puddle compared to what you have planned... 8000l with a shower.

    IMO there are no dealers close to us, The only ones near enough that I've found are Gatwick koi and Cuttlebrook. You're welcome to pop round and see what you think of them. No prize winners here though!

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  13. #9
    Senior Member Rank = Yonsai farmergoggin's Avatar
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    You got new forest koi but I believe they are uk bred but I could be wrong?!

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  15. #10
    Senior Member Rank = Grand Champion voodoo_15_uk's Avatar
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    Hi and welcome, that’s gonna be a whopper of a pond! Looking forward to seeing it progress.


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  17. #11
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Hi and welcome mate. Looking fwd to the build. Lots of photos. As we all love a good build. Have you built a pond before.

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  18. #12
    Hi Freddy,
    Yes when we lived in Cornwall we built a liner pond, and had some nice Koi and a couple of DB Sturgeon, we only finally got the filtration sorted 6 months before we had to move away for work, which was gutting, as the new owner wasn't interested in the Pond or Fish, so had to sell (give) the fish and kit away, this is part of the reasoning behind hitting it hard with this build and hopefully getting it right first time.

    Attached is the plan as it stands today, which cant change much as we plan to start the Slab on Monday which is a 8M3, and I think we will probably get a pump to make thing easier, I haven't had chance to get a load of quotes yet but the first one was coming in at £100/M3 + £350 for the pump...does that sound about right ??

    Cheers.




    Capture.JPG

  19. #13
    Quote Originally Posted by farmergoggin View Post
    You got new forest koi but I believe they are uk bred but I could be wrong?!
    I've been there a few times, but never seen a fish that I've liked enough to buy. Whenever I travel to Gatwick or cuttlebrook, I struggle to decide *which* fish...

    Picked up a stunning Ochiba from Cuttlebrook the weekend before last...

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  21. #14
    Hi all,
    Quick update:
    We have ordered the Burtons TF700 drum and 1500x600x1000 bio stage this week, the pond lights have and TSP30000 pump have arrived from China, and look good.

    We have the bottom drains in place and will be fixing them down today as well as whacking down the MOT in prep for the 7M3 of concrete coming on Tuesday.
    ....I had better get to it then.

    Cheers
    Attached Images Attached Images

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  23. #15
    Extreme Koi Member Rank = Gosai digger's Avatar
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    Looks like a cracker of a build. So exciting at this stage too; full of anticipation. Keep posting your pics mate. 36000tr/8000Gal new Pond

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  25. #16
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Agree lots of pictures looks like it is going to be a great build

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  26. #17
    Extreme Koi Member Rank = Kyusai Scamp's Avatar
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    Good luck with it, looking forward to following!

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  28. #18
    Bottom drains concreted in and suction lines covered took longer than we thought, but then we had some other household DIY to do, as alongside the pond we are completely renovating the house and I’m right into making stuff out of wood and in particular English Yew as it looks absolutely amazing when it’s flow coated in clear resin.

    MOT in and whacked down tomorrow, now need to do quite a bit of reaearch on fibre glassing as although I have always worked in the marine industry I’ve never learned about composites.

    Just added a few pics of the 316stainless pond windows in build, very lucky ineed to have colleagues that are excellent fabricators, once they are finished and I am 110% sure of the finished dimensions the I will order the 25mm laminated toughened glass.
    Last edited by Forest Way; 05-05-2018 at 10:01 PM.

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  30. #19
    Last minute panic this morning, when I realised we hadn’t tested the BD or airline pipe work (thanks to a timely reminder on Scorchios thread)
    So it up at the crack of dawn with hose pipe that was nearly long enough and Overfilled the pots so now the ground is wet and couldn’t tell if they were leaking or not, so made up a few dipsticks, looks all fine... and needs to be as the truck arrives any minute know.

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  32. #20
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Good luck with it mate. Lots of photos.

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