The rain pond is now a pond at last… just! By doing the work slowly over a few weeks it has meant we have had plenty of thinking and reading time as plans have needed adjusting.
Here is the hole at its most visible, which has various levels for planting as well as some deep water and a shallow concrete area we plan to cover with cobbles. The concrete path luckily turned out to be not as thick or hard as feared, although being laid on top of concrete pavement slabs meant that it broke where the joints were rather than exactly where we planned. There was more concrete at a depth of 2’6”, which we considered leaving in place; however after a few days of looking at it, I decided the hole was not deep enough so a hole was punched through part of it leaving a small shelf for deep plants or for standing on if needing to climb out of the pond.
I did not plan to have the shelf along the side, wanting a greater volume of water if possible, but after reading suggestions that marginal plants would cope better with a pumped pond than deep water plants, I left the soil in place. Not as large a shelf as I first made it – again, time played a role in allowing me to feel where it was right and where more soil removal was needed. (The pump won’t be installed until a second pond is in place further up the garden.)
Many books seem to suggest that it is very hard to dig a pond and the hire of a digger is almost an essential tool for the job. I didn’t want to use a digger, I wanted to do it myself. Besides the damage a digger would cause to the surrounding garden would take months to restore. As it was, the digging turned out to be the easy bit, whereas carting bucket after bucket after bucket of soil to spread in the garden, and finding enough places to put it where I was only covering weeds not valued plants, proved a far bigger challenge!
All the soil dug out was eventually transferred to other areas of the garden. You may be able to see by the colour of the sides that most of it is good, usable topsoil. However at one end of the pond we were into stones and clay; the stones have been kept for later use while the remaining clay and gravel was spread by the side of the garage where it unlikely to support too many weeds.
Yesterday we spent the day leveling the edges, spreading sand on flat areas and smoothing out some of the lumps and bumps,laying out the underlay and finally lining the pond and filling it with water. A canoeing drysuit came in useful as the many pleats in the liner needed easing into flatness! So the pond is now ready for some edging stones, and then I finally get to put some plants in, by which time the water should have de-chlorinated itself. All future top-ups should be rainwater, either directly from the sky or via roofs and waterbutts.