Once the retaining wall was built (see previous post-May 23) we began to fill the area with dirt. I had 7-1/2 yards of a good fill dirt delivered along with another 7-1/2 yards of a planting mix for top dressing. We were able to get the fill dirt in place before we had to start building the front retaining wall with the blocks I had purchased.
used a 1/4-minus gravel for the bed of the block wall. This material is very easy to work with and compacts very well. The pictures may not show it, but the lawn in this section of the yard slopes to the fence quite a bit. I started in the high side and used the 1/4-minus to keep the wall level as I proceeded to the sloped portion. Doing this saved my about 30 blocks that I would have had to dig in if I had started on the low end. It also saved a lot of time. It leaves a bit of the 1/4-minus showing on the one side, but the grass will cover that quickly.
Before I went much further, I ran the water and electricity just past where the wall would be. The electrical service was run to a waterproof box that would sit just below the top of the wall. The water line was split just inside the wall so a valve could be put in to run the sprinklers that would be used to water plants. The other half of the line was a “hot” (always under pressure) line that led to a hose bib to top off the pond when needed.
Next I placed the pond at the lowest portion of the area and positioned it. I used 1/4-minus as a base and then put loose dirt around it to hold it in place. Later, as the mound of dirt grew around it, I would add more dirt to solidify it’s position.
I placed the pump I had purchased in the pond and ran the cord to the electrical outlet I had installed. And here’s an important tip for you: Most pond pumps come with the cord attached. You can bury the cord under the dirt and it’s fine. However, I’d put in a piece of PVC pipe, big enough for the plug to go through easily, under the dirt. Pumps these days last a long time, but nothing lasts forever. Replacing the pump will be much easier if you can pull the cord through a pipe instead of digging a trench all the way to the outlet.
Another note about pumps: Get one big enough and don’t go cheap on it! This is one little piece of hardware that will make the whole thing work, so spend the money and do it right. I chose a 3600 GPH (gallons per hour) unit by Garden Treasures that I bought at Lowe’s for about $180. It has a five year warranty and has 22 feet of head (meaning it will pump it’s rated GPH up to 22 feet above it). Is it the best pump out there? Probably not, but for the size of fall, length of warranty, cost for the budget, and ease of replacement later, it was for me.
I ran the plumbing to the back of the corner and up well beyond what I thought the top would be. That way I had pipe to cut, rather than pipe to add. I used 1-1/4” PVC which was the largest that I could adapt to the unit. The thing that is different about water features versus, say a sprinkler system, is that volume is king, not pressure. I wanted all the water I could get at the top so that gravity, and my handiwork, would take care of the rest.
I kept a small section of the wall down to leave room for the wheelbarrow so I could keep bringing in the topsoil. At this point I wanted to get dirt packed around the pond and plumbing and the balance into the corner then finish the wall. Once all the dirt was in, we could finish the wall and begin sculpting the look we wanted.
Our goal was three streams/falls leading to the pond at the bottom center of the mound. I started with a bowl at the top in the center that would be the basin I would pump water into. From there the water would flow down the streams and the series of falls built in them, finally ending in a last fall into the pond at the base.
I used a ground tamper to start the runs and make grade changes. Once I had a rough path for the runs I placed a pond liner (60 mil plastic) in the center one to test the effect of my labor.
Things seemed to work well with the center fall, so now we had to add the left and right runs. Each run, just like the center one seen above, is lined with 60 mil pond liner.
Either I am very lucky, or this isn’t as hard as it seems. In my case, it’s probably both! I just tried not to put too much thought into exactly sculpting the falls in the runs. I wanted a series of small falls with a stream-like effect so I made stairs, basically, and covered them with plastic and let gravity do the rest. One thing that was important, and a bit challenging, was the bowl at the top. It had to be even on all sides and level so that one run didn’t get more water than another. Once that was done, it wasn’t hard at all to make the runs and I let my imagination take over with help from my wife.
The finishing touches were left to my wife, as in this department she is definitely the brains and I’m the brawn. We placed decorative river-stone in and around the runs and accented them with cobbles of the same type. I put in pieces of slate at every flat spot during the runs, and also as the end at the pond, to give the waterfall effect. We also added some small boulders for height effect at the left right and top. The last thing we will do, hopefully this weekend, is create a “fake” rock that will cover the inlet at the top of the waterfall. I’ve kept the distance between the inlet of the water pipe to the top bowl because I like the sound of the water entering the bowl in addition to the water cascading through the runs. I’m looking for a creative way to hide the pipe, but keep the sound. I let you all know how that turns out.
Here’s the (almost) finished product: