Pond (again)

 On the 4th May 2013, we built a pond using a 4x4m underlay and liner. The pics are here

G:\photos\Garden\Pond\Construction

We'd been suspicious that it was leaking for a few years and finally bit the bullet and changed the liner. About 100 common newts, 7 marbled newts and 3 midwife tadpoles were temporarily re-homed along with a lot of other wildlife. The old liner did have a hole - looks like a mouse. The old liner was a woven affair with a plastic coating. The UV weakens it and it can then tear if pulled.

However, we also had a natural spring and this, along with heavy rain was pushing the liner out. 50mm of hardcore at the bottom got rid of the soggy clay. A 8cm drainage pipe was dug from the bottom to let any water out. EDPM 1mm liner and 300g/m2 underlay.

Carried about 600L of rain water up, plus say 300L from the temporary pond got the level approaching the top. Temporary pond followed the contour of the land and was a new 3mx3m tarp. Boards and concrete blocks (~10)

https://boutique.aquatiss.net/bache-bassin/200002-bache-epdm-bassin-feutre-protection-300gr-etancheite-bassin-baignade-naturelle.html#/200002_dimensions_epdm_bassin_1_mm-4_57_m_par_5_00_m

EPDM bassin 1 mm + feutre de protection PECT bassin 300gr/m² (certifié CE)

Largeurs de l'EPDM : 3,05m  / 4.57m / 6,10m / 7,62m 

Largeur du feutre géotextile : 3 ou 6 m. Le feutre est découpé dans la longueur.

LA BACHE EPDM BASSIN

L'étanchéité pour bassin en bâche EPDM (éthylène-propylènediène-terpolymère) est un élastomère (caoutchouc synthétique obtenu par polymérisation) qui offre une très grande élasticité (400%), même à basse température.

Utilisations 

La membrane EPDM est utilisée comme système d'étanchéité dans la réalisation d'un bassin de jardin ou d'une baignade naturelle. Elle est posée sur un feutre de protection 300gr/m² pour la protéger des éléments du sol pouvant l'abimer.

Avantages

Grande élasticité

S'adapte à toutes les formes de bassin

+ économique qu'une coque préfabriqué

Durée de vie : 50 ans

Résistance anti UV / rayonnement / ozone / oxydation

Installation : toutes saisons.

Installation

On peut envisager une installation en plein hiver, elle reste tout à fait malléable et garde ses propriétés mécaniques jusqu’à -45°c.

Sa longévité est garantie pendant 20 ans.

Ce produit est recyclable, il ne dégage pas de produit toxique à l’incinération et reste inerte dans l’eau, le sol, et à l’air. Le collage s’effectue par vulcanisation à froid.

Découvrez toute notre gamme d'accessoire pour l'assemblage et le collage de votre membrane EPDM.

  

GEOTEXTILE DE PROTECTION 300gr

Géotextile non tissé en polyester coloré, aiguilleté et calandré. Produit sans utilisation de liants chimiques.

Feutre de protection certifié CE PECT300   300 gr/m² en différentes largeurs.

Les géotextiles de protection sont utilisés pour protéger principalement les systèmes d’étanchéité tel que les géomembranes, bâches de bassin, liners de piscine, complexes drainant, et tous autres matériaux ne pouvant pas supporter les agressions plus ou moins prononcées des sols, des bétons ou tous types de matériaux poinçonnant. 

Caractéristiques 

Marquage CE, 

Couleur : grise, 

Fibres polypropylènes insensibles et résistants aux agents cryptogamiques et fongiques.

Résistance à la traction : 15 kN/m

Résistance au poinçonnement dynamique (mm) 15 mm

Résistance au poinçonnement statique pyramidal (N) 200 N

Résistance au poinçonnement statique CBR (kN) 2,20 kN

Vous pouvez également commander ce géotextile seul dans notre rubrique "Feutre de protection bassin". 

Bamboo

Kind of regretting planting bambou phyllostachys bissetii (just found the label) in March 2010. It was such a sweet little plant and we're sure it said it wouldn't spread much. It's now about 10m x 4m. It is classed as a running type as opposed to clumping. Some sites describe it as a vigorous runner, but that doesn't seem to be the case for us on clay in southern France.

Every year we remove new shoots and it's usually several hundred. 2023 gave ~560. 1 popped up in the middle of the drive, so I felt it was time to investigate. A trench revealed 8 rhizomes under the concrete drive.

There is no commercial product to kill rhizomes (possibly stump killer) and glyphosate only works on leaves. We'll be chopping the rhizomes off and watching for new growth.

 Almost every year our neighbour has told us a story of bamboo appearing in his house from his neighbour on the other side. Luckily it's a long way from his house...

I've just dug a test trench and it looks like I'll 'only' need to trench down to 0.5m to install the barrier. The soil is almost normal there and from the 2010 pictures it is firmly clay.

20/3/24 Dug a trench about 13m along all around the bamboo. Had to cut out 3 large parts, one towards the ditch and 2 towards the large rock. I had originally decided to trench more towards the drive, but decided that the level changes would be too tricky to bend a barrier around. Bought a 1mm barrier from here https://barriere-anti-racine.com/sol-standard-1-mm/126-569-barriere-anti-racines-eco-1mm-speciale-bambous.html#/33-rouleau-050m_x_25m. Even at 1mm thick it could be fairly readily creased and pleated to keep a slight lean, and still go around corners. 69.49€ delivered.

Barrière anti racine ECO 1mm spéciale bambous

Référence : JAR_BA_50_10_25_R

Polyéthylène Haute Densité (PEHD), noir, 100% recyclable, densité 940 g/m², épaisseur 1 mm

Got 16m of barrier and had some spare. Angled slightly, and back filled just as a storm started.

Found the 10cm outlet pipe from the fosse at 45cm deep on the uphill side. The join is about 20cm to the right of the pipe. Didn't find the pipe at the other side.

31/3/24 removed 10 shoots outside the barrier ditch side. 3 good size ones inside.

4/4/24 removed 35 in last 2 days. A lot inside the barrier

5/4 54 removed. 2 out of reach.

14/4 Kind of got bored of picking shoots, so spent an hour or so over the last week digging out the remaining clumps.  I got lucky with a few into the ditch that were thin. I now have a very impressive pile of rhizomes drying in the sum before I knock off the soil and return it to the increasingly holy area around the bamboo. Today I dug some more out that sprouted including a stealth one that had mad it half way to the road.

23/4 found another 2 stragglers today. They grew 15cm overnight. Not particularly long and had been cut off from the mother originally. New growth inside seems vigorous and has in some places exceeded the existing height of approx 1,5m. 1.5m at the rear, ~2m at the front was chosen last year as easier to maintain and get the bramble out.

27/4 A final (!) shoot with tiny leaves, and very short. It led to another few which had been severed from the main plant and were just below the surface.

Bamboo was beyond the 3 rocks bottom right

Ditch to the left. This was all bamboo.
Plenty of new growth inside the barrier to the right

Plenty of new growth

Originally it went from the left of the large rock and down the slope to the right

Research sites

https://bambouenfrance.fr/racines-bambou/ table showing root depth (to ~40cm but phyllostachys bissetii  not mentioned)

https://lewisbamboo.com/pages/controlling-bamboo trench to 45cm generic bamboo

https://www.gardenersguild.com/5-things-to-know-about-the-bamboo-plant

tough horizontal bit is rhizome. Thin bits are roots.

Like the roots of other non-rhizomatous plants, these are the soft, white, fibrous tendrils that creep down into the dirt. In bamboo, the roots tend to emerge from the nodes of the rhizomes. While the rhizomes spread out and generate the growths that will become new shoots and culms, the delicate roots mainly grow downward and are responsible for drawing water and precious nutrients out of the soil.

https://bambubatu.com/bamboo-anatomy-9-parts-of-the-bamboo-plant/

https://www.houzz.com/discussions/1735570/phyllostachys-bissetii-clumping-or-runner

'Most definitely, positively, NOT a clumping species. '

no need to remove rhizomes - they die.

Hedge

 Cut the neighbour's hedge near the log pile and the bamboo