A Bigger splash – weeks ten and eleven – story of a swimming pond for a garden designer

 

As I write the words ‘weeks ten and eleven’ I can’t quite believe that it has been that long, despite the fact that I knew this process would take at least 2-3months. Despite this, the progress in the last couple of weeks has been phenomenal. Our beautiful Pennant paving went down this week, with a set of steps, the dramatic curved path and a counter-sweeping curve of stepping stones through the lawn. The path is a thing of beauty.

However, the more Vicky and I looked at it, the more we thought that the line of it through the

The Pennant stone path - a thing of beauty

lawn was not quite right. The idea for the stepping stone part of the path came from Glyn, our hardscape foreman (as opposed to Glen, our hard landscape manager, which is confusing for everyone). There’s a frustrated designer inside everyone. It was a great idea, and one which we latched on to straightaway; so much so that we didn’t draw anything out first (is that an alarm bell I hear ringing?). So in this morning’s drizzle, I said to Glyn that we were going to have to relay the 14, 110kg stones in a slightly different line. “You are winding me up, aren’t you?” was his not unexpected reaction. We just knew that if we didn’t re-lay them, we would be looking out of the window for the next twenty-five years regretting it. He should have expected it really, working for a couple of designers!

The irony of this was not lost on me. I have spent the last two or three days (in between other stuff) writing my presentation to the SGD conference in London on Saturday. In it I underlined the importance of good communication, a clear set of drawings and specifications, communicating with the site staff etc. etc. Alright, I know, calm down at the back there. So I write this blog to say that listening to the client is also important! When they change their mind, accept with good grace (do you think I got away with that?)

 

The shallow end of reclaimed teak at the far end of the swimming pond

We decided fairly early on to have a ‘shallow end’ in the pool. Rather than rake the bottom of the pool, we have achieved this by building a timber deck which will sit below water, giving us a depth of about 1.2m for the first 4.5m or so of one end. The frame timber is made up of English larch (from my new friends at Eco Choice) which does not leak any nasties into the water. The deck itself is made from reclaimed teak. Timber of course floats, so it may seem a bit counter-intuitive building an underwater deck. Once the wood becomes saturated (which takes quite a while) it is not nearly so buoyant, with the teak becoming heavy enough to sink. However, until then, it must be weighted down with concrete blocks, although our calculations as to how many are so unsure that we just decided in the end on ‘a lot’. We will fill the pool up slowly and see whether the deck floats. It’s called the scientific method – reaching a provable result through a controlled experiment (otherwise known as trial and error).

In the almost final fortnight (apart from re-laying slabs), the lawn will go down, the sun deck will go into place and the pool will get filled and planted!

A Bigger splash – weeks eight and nine – story of a swimming pond for a garden designer

 

The completed liner for the swimming pond, looking towards the path end. The skimmer pit is in the foreground.

As of Friday night, the installation of the liner is finished and the pool is (hopefully) watertight.  I will resist all the obvious puns regarding liners and launching. Suffice to say that although we didn’t crack any bottles of champagne on the ‘bow’ of the pool, we had a small celebratory drink at what is after all a landmark in the construction.

Detail along the sleeper wall. The liner is trapped between pieces of timber and then sealed.

You might remember from (much) earlier posts that we decided to go for polypropylene rather than PVC partly on the grounds of it being manufactured in the UK, but also because it is a lot less environmentally damaging in manufacture. My concern with this was that it was very stiff and might look a bit ruckled following installation. I needn’t have worried. The appropriately named Tim Pool (yes, really) who is doing the installation of the liner for us did a fantastic job with almost no creases or ugly lumps. It did take quite a lot longer than we expected (like most things on this job), but the result looks great. I have posted a couple of pictures of some of the details as well as the main photo. The marginal beds with curves on both sides were particularly difficult. To seal the liner against the sleepers was tricky – we don’t like to make things easy for ourselves – we used a chunky piece of larch that we used to secure the liner against the timber sleepers and then enclose in liner. This stops the liner tearing against the fixings once loaded with water.

Similar to the timber detail, but using metal edging.

On the lawn side we used a similar method with a strip of metal bolted to the metal edging, which was in turn secured in concrete haunching. This may all seem a bit belt and braces but the pull on the liner once it is full of more than 200 tonnes of water is huge.

Although the rain has made working on the lawn grade difficult, we have made progress towards final levels. So much so that I am now beginning to think we might not have enough subsoil and topsoil! All those enormous piles have gone – I can’t quite believe that all the calculations were right.

Hopefully an end to these...

What I really cannot face is the incessant battles with the local mole population which has gone on for the last six years. This peaked when, on our return from our summer holiday a few years ago, we were confronted 40 molehills on the lawn. My heart sank. I spent 3hrs or so on my hands and knees opening the tunnels and burying all the soil so the lawn was green again. Next morning: ten fresh molehills – this was war! We tried everything – flooding the tunnels, battery operated sonic devices, solar powered devices, traps, with limited success. The ultimate indignity was finding a sonic device toppled by a fresh molehill – a sort of moley ‘two-fingered’ response. The dispute as to whose lawn it was dragged on for several years until I recently solved it (temporarily) by digging it all up. We had to find a more permanent solution by which we could both share the lawn. After a lot of research, we have come down in favour of a German product (suggested by Jens in our design office) which allows the moles to tunnel beneath the lawn but prevents them producing molehills. An honourable compromise that should restore peace. You can get details from Harald Unger at http://molebarrier.com/3.html. It is installed about 50-70mm below the surface of the turf. If I never see another molehill, it will be worth it.

From now it is a sprint to the finish. Marginal beds in the pool to be filled and planted, plumbing completed, paving laid, pool filled, lighting to be installed, lawn laid and decking constructed (both underwater and outside the pool). Soon there will be no more mud in the house…