August 2008

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Another example of an inexpensive wall to support your waterfall is a pressure treated wood wall. The pressure treated wood will last longer than other lumber, and is a better alternative than the dwindling supply of redwood trees. When using pressure treated wood, it is important to wear gloves when handling, and proper ventilation masks and eye protection when cutting the material. Pressure treated wood is treated with chemicals to prevent decay, should not be inhaled, and hands should be washed.

A good support wall should have 4×4 posts set in a hole at least 18″ deep. Each post should be set no further than 4′ apart and each post should have 2 pieces of rebar driven down in the hole, and filled with concrete. Make sure the posts are level in all directions, and leave the posts to dry for at least one day. It is important to measure the posts properly to fit the desired length and width as well as the length of wood used. For instance, if you are using 8′ long pieces of lumber, make each post 4′ on center from each other. This will insure no wasted wood, and less labor and cuts.

After the posts are set its time to screw in the wood. Each piece of wood should be screwed into the post facing the front (waterfall side). The size of lumber that you use is really up to you, but I would recommend utilizing a 2x12x8′. This length is easy to use and makes for simple measuring.

After the wood is screwed into the posts it is important to attach landscape fabric to the wood that will be touching the soil, this will allow the wall to last even longer. Drainage is also an important factor in building these walls. Even though the support walls used for waterfalls will not be holding much weight, it is still important to have drainage.  Slowly fill the area next to the landscape fabric with 6″ wide of drain rock, all the way to the top. As you move in the drain rock tamp down the soil next to it all the way up to the desired height. After you have tamped down the soil for the waterfall, you are ready to build your water feature.

There are many different walls that you can build to support the soil of the waterfall.  The cheapest and easiest wall will be the “Dry Stacked Rock Wall”.  These walls have been built as far back as the roman times, and still stand today.  These walls consist of natural rock that are set in the soil, and built up on top of each stone.  It is important to utilize a rock that is more squared or angular, than a smooth rock, for they will stack easier.  The bottom rock is your foundation rock, and should be the biggest, as well as the most leveled rock.  From there each rock should be tamped into place with a rubber mallet until each rock is set.  Then back fill with soil as you go, until you reach the top.

This type of rock wall will be totally stable up to 3′ tall, after that height the constitution of the wall is weaker.  These rock walls are successful due to the natural drainage it provides.  Each rock space will drain the water from the ground above.  Most walls fail due to build up of water behind the wall, which in turn blows the wall out.

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It can be done!  Dig the reservoir and tamp down the cascade area.  Chisel out the waterfalls just like a staircase.  Lay down the underlayment, install the liner.  Set in the Bio fall filter and Skimmer unit, hook up the pump and your ready to rock and roll….literally, start to move the rock in right away to level out all the filter units.  Build your cascades, foam in the rocks, fill the pond and turn it on.  Now sit back and enjoy.

So you want to build a waterfall in your garden, but you don’t know where to start? Careful consulting and proper planning can increase not only the finished feature, but it will make the installation process go much smoother. The first thing to consider will be the location of the waterfalls. The best place usually will be the corners of the yards, and face the cascades towards the most viewed direction. It is very important to plant heavy behind the water feature to give the illusion that there is a hill behind the waterfalls, and there is an implied source for the stream.

Another consideration is the type of rock to use. You will want to look at the existing house and materials used in the garden. If you have earth tones, stick with Tan “Moss rock”, or a more interesting rock such as “Travertine”. Or if you have a lot of concrete or greys, then stick with a Grey “Water washed rock”, or a blue toned “Kryptonite” and “Great Falls Boulders”.

A few more items need to be addressed before you can get started with the construction. Are you looking for a pond to house Gold fish or Koi. If so you will need to dig out a pond 2′-3′ deep for goldfish, or a 3′-6′ deep pond for koi. The edges of the pond should be cut for planting shelves with a 1′-2′ run. A skimmer is recommended for all ponds, it will help to skim leaf and debris from the pond, and will house the auto fill refill valve. An “Ecosystem” will need to be implemented, utilizing microorganisms to eat the algae and bacteria in the water. Ponds will require more maintenance than most water features. The skimmer net will need to be emptied when it fills. The mesh filters will need to be washed down with a hose every 2-4 months. Water plants may need to be divided once a year, along with a yearly cleaning via a pressure washer and filter cleanings. Total cost for maintaining a pond is approximately $500 per year. This cost is still less than the maintenance cost of the same square footage of lawn. The water feature itself will also consume less water than the same area of lawn.

Another option to consider if you want the sights and sounds of a waterfall, but you don’t want any maintenance or liability, is a “Pondless Waterfall”. This system is just like it sounds where, instead of a pond, there is a reservoir filled with rock and pebbles to where you can walk upon it. The waterfalls will cascade into those pebbles and give the illusion of disappearing into the ground. This system can be turned off with no standing water for mosquitoes, and doesn’t have deep water for children liabilities. The maintenance of these systems require only a once a year pressure washing of the rocks.

Once you figure out which direction to aim the feature, which type of system you want, and the type of rock, you’re ready to rock and roll. Check back in, we will be discussing, in depth, all the steps you need to take to create a professional water feature that will last!

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