1-1a: Determine the Path of the Water Feature

When mapping out the path of your water feature, consider bends in the stream and waterfall drops. A natural looking stream channel should appear “ageless,” as if it has always been there. To best accomplish this, choose a location with a slope. If you don’t have much of a slope to work with, as an alternative you can choose to create water flowing from a boulder or rock grouping. You can also create a subtle rise in elevation with a well planted landscape berm or rock outcroppings that blur the transition from flat to slope.


Note:
Make sure that the water feature is following the appropriate length and width determined by the selected system. It is crucial to follow the size restraints for sufficient water storage. To ensure accurate length and width during excavation you can use tools such as marking paint to mark the determined path.

1-1b: Select a Spot for the Filter Tank Reservoir

In a Vanishing Water™ installation the Filter Tank Reservoir Reservoir can be located remotely from the end of the water feature. In relation to the end, the top of the Filter Tank Reservoir can be placed even with the ground level around the water feature (at grade) or it can be placed downhill from the water feature (below grade).

1-1c: Choose the Intake Route

The Filter Tank Reservoir can be positioned as needed to avoid an obstacle, keep it out of the lawn, or be best aligned with additional expansion reservoir units.
The intake route is that of the pipe between the Fixed Skimmer and the Filter Tank Reservoir. With a Berkey System you can place the Filter Tank Reservoir away from the water feature enabling you to customize your intake route to best fit your landscape.

Common Intake Positioning:
Intake routes for 4” IPS pipe (up to 80 GPM) and 6” IPS pipe (up to 200 GPM) can have the intake pipe run straight and level up to 50 feet (10ft less per bend).

2-1: Excavate for the Pooling Finish or Stream Ending

Option 1: End in a Stream

To end your water feature as shown below to the left, excavate 6” deep at the same width as the stream.

Option 2: End in a Pooling Finish
Excavate 9” deep to allow a 3” deep pooling finish. If there is a waterfall above this, the length of this area should be at least 1-1/2 times the drop of the waterfall to contain the waterfall splash. For installations using the T390F Filter Tank Reservoir, excavate 10” deep to allow a 4” deep pooling finish.

2-2: Dig the Skimmer Pocket

The skimmer pocket is located at the end of the water feature. Excavate 6” deep for a stream without a finishing pool and 9” deep for a 3” pooling finish.

Drill a 1/2” hole through the indent on the front of the Fixed Skimmer. This will allow water to drop below the top of the Fixed Skimmer and below the top of the gravel when the pump is turned off.

2-3a: Excavate the Central-Stream Area

Excavate the Stream Channel
A natural looking stream shows signs of erosion from years of water carving a path through the landscape. Avoid a “flying stream look” where water runs over the surface or appears elevated without any aging or character. The following instruction is a general reference to keep the water flow within the stream channel and help you build a natural looking water feature.

While excavated depths will vary with each installation, the excavated stream depth should never be less than 6” deep. The excavated depth should increase where the stream drops. This will not only keep the flow of water within the stream, but also create the illusion that the water feature is a natural part of the landscape, not an addition to it.

The same ground slope with a stream that more closely parallels the natural slope will have shallower drops and generate fewer splashes, This uses less rock but produces less noise. Sweeping turns often complement a gradually sloping stream by adding a lateral dimension in place of dramatic vertical drop.

Larger drops create a dramatic look and increase the sound level. However, they require more rock and cause more splashing, which can contribute dramatically to increased evaporation.

2-3b: Cut Waterfall Drops in the Channel

Consider the following slope options when excavating for the waterfall drops
Depending on how the rocks will stack up – the top spill rock can rest (A) on the top of the step, (B) rest on a slightly notched shelf, or (C) for short drops, simply extend up an inch or two in front of the step.

2-4: Waterfall Starter Excavation and Placement

Excavate a Shelf for the Waterfall Starter
Choose option A or B.

Option A:
This configuration requires the least amount of space.

Option B:
If the start of the waterfall will be placed directly at the viewing eye level, a slightly recessed starter disguises the hardware and provides a more natural start to the water feature.

3-1: Place the Underlayment

Remove Sharp Debris from Stream Channel
Make sure the excavated channel is free of rocks, sticks and roots that could puncture the liner. Where several layers of rocks will be stacked, a slight amount of wetted sand can be added to make a smoother subsurface.

3-2: Place the Rubber Liner

1. Lay the rubber liner over the fabric. Be sure that no rocks fall between the layer of underlayment and the liner, as this could damage the liner and possibly cause a leak.

2. Center the liner from top to bottom and from side to side. Don’t be in a hurry to cut off the excess liner, as it can be trimmed later. Always allow a little extra liner to overhang the sides. Up to 6” of excess liner can easily be folded under as the final rocks are being placed.

3. Avoid making lateral folds that can traverse water over the side wall. Keep in mind that all water that laps or splashes against a sidewall must be able to flow back into the channel. Be very attentive to this when placing the rocks.

4. Waterfall drops bunch and gather liner from the sides, so give yourself plenty of liner to work with in these areas.

Be sure to give the liner a little slack over the waterfall drops. Push liner into the corners and up against the sides so the liner isn’t stretched before or during rock placement.

4-1: Place the Rocks

Place only rocks with smooth edges against the liner. If a rock has a sharp edge, reposition it so the sharp edge is away from the liner.

5-1: Cut Off the Applicable Ports

Cut off the ports that you plan to use, either before or after placing the Filter Tank Reservoir.

Note: Filtrific provides different port size options with each Filter Tank Reservoir. Make sure the Flex-Coupling included with the kit fits over the port before cutting.

On a Filter Tank Reservoir:

There are multiple “Discharge” ports to choose from. The pump discharge can exit either the front or the back of the Filter Tank Reservoir.

5-2: Excavate for the Filter Tank Reservoir & Any Expansion Reservoirs

Now that you have established where finish grade will be around the water feature you can excavate for the Filter Tank Reservoir. Dig the hole so the top rim of the Filter Tank Reservoir is level with the lowest edge of the water feature.

Note: When excavating make sure to plan for the Filter Tank Reservoir and any Expansion Reservoirs. Make sure the Filter Tank Reservoir and any Expansion Reservoirs will fit within the excavated area with about 6” of room for connection fittings.

Allow room for 1” of compacted sand below the Filter Tank Reservoir. This cushions the bottom of the Filter Tank Reservoir and also makes leveling easier.

5-3: Position the Filter Tank Reservoir & Any Expansion Reservoirs

5-4: Level the Filter Tank Reservoir

Level the Filter Tank Reservoir and backfill up to where the T40SP Expansion Reservoir(s) will rest. Add a layer of compacted sand and slide the T40SP Expansion Reservoir(s) into place.

5-5: Connect the Expansion Tank Manifold to Filter and Expansion Tanks

Level the Filter Tank Reservoir and backfill up to where the T40SP Expansion Reservoir(s) will rest. Add a layer of compacted sand and slide the T40SP Expansion Reservoir(s) into place.

The T75F (shown right) has a T40SP Expansion Reservoir connection port on the front of the tank. The T40F (not shown) connects to the T40SP Expansion Reservoir using the back-lower port labeled “More Capacity.”

6-1: Run the Intake Pipe to the Water Feature

At Grade
Step 1: Excavate the intake trench from the edge of the liner to the Filter Tank Reservoir. If the Filter Tank Reservoir is level with the water feature, dig the intake trench so the pipe will be level.

Below Grade
Step 1:When the top of the Filter Tank Reservoir is placed lower than the rim of the pooling finish, the rim of the pool becomes your reference point. To find the penetration point of the intake pipe, measure down
8-3/4” for 4” and 6” pipe and 10-3/4” for 10” pipe. Elbow down accordingly to connect to the Filter Tank Reservoir intake port.

Step 2: Place the Flex-Coupling over the intake port and tighten the stainless steel clamp.

Step 3: Insert the intake pipe into the coupling and tighten the stainless steel clamp.

6-2: Run the Intake Pipe Through the Liner and Connect to the Fixed Skimmer

Step 1: Using the cardboard tracing pattern, draw a circle on the liner at the center point of the pipe.

Note: Allow an expansion fold below the pipe.

Step 2: With scissors, cut out the traced circle from the liner.

Step 3: Stretch the liner over the pipe; this creates a tight sleeve
band around the pipe.

Step 4: Place the flex-collar over the rubber band and tighten.

Step 5: Connect the Flex-Coupling to the pipe.

Step 6: Insert the skimmer outlet to the Flex-Coupling.

Step 7: Check to ensure all stainless steel clamps have been tightened. Then firmly backfill over the intake pipe so that it will stay level when it comes time to fill the system with water.

7-1: Connect the Pump Discharge and Flex-Pipe

Connect the pass-thru Flex-Coupling to the discharge port and slide the discharge pipe through the port. Use PVC Solvent Cement to connect the discharge to the flex-pipe.

7-2: Connect to the Waterfall Starter(s)

At the top of the stream repeat “Connecting to Liner” (section 6-2 and 6-3, steps 1-5) using the smaller tracing disc and 3” pipe included in the Waterfall Starter Kit.

Step 6: Insert the Waterfall Starter outlet to the Flex-Coupling.

7-3: Disguise the Waterfall Starter

Place rock on top of the Waterfall Starter so the source of water is hidden.

7-4: Place the Cement Behind the Waterfall Weir Rocks

At each waterfall drop, place a strip of concrete over the extended fabric to force the water flow over the weir rocks.

Fabric allows trapped water to drain down stream when the system is shut-off.

8-1: Connect the T40SP Expansion Reservoir Venting

The air vent on the T40SP Expansion Reservoir helps create a smooth transition for water flowing in and out of the tanks.

The vent should be placed in a planting area, or valve box, and should be positioned higher than the Filter Tank Reservoir overflow.

8-2: Connect the 165XP Expansion Tank Venting

For Standard Flow installations the lid for the T165XP Expansion Reservoir includes air venting. For High-Flow installations additional venting can be added by connecting a vent pipe to the “Overflow” port.

8-3a: Filter Tank Reservoir Overflow

The overflow allows excess rainwater to go out of the overflow rather then puddling up at the base of the water feature.

How the Overflow Works:
When the system is turned off, water in the stream refills the Filter Tank Reservoir and Expansion Tanks to the bottom of the “Overflow” port. Rain water will replenish any evaporation loss until the water level in the Filter Tank Reservoir rises to the bottom of the overflow. Excess rain water will now flow out the overflow to prevent a standing pool of water from developing over the top of the gravel when the system is not in use.

8-3b: Drain Options

Drain to Daylight
Route the overflow pipe to drain onto an existing slope. This is suggested when you have a slope in your landscape that supports excess water run off.

Drain to Storm Drain
If you can’t drain to above ground, tie the overflow pipe into a existing yard drain or downspout drain.

Note: If neither of the above options are possible, excess rain water can be drained into a gravel swamp at a location away from the Filter Tank Reservoir.

9-1: Fill the System with Water

Make sure the intake pipe has been backfilled. If you are installing an optional Auto-Fill or Pump Shut-Off, these should be positioned (see section 10) before adding water. Fill the system to the bottom of your overflow and turn the pump on.

9-2: Turn On the Water Feature

Water should return to the Filter Tank Reservoir before all the water is pumped out of the tank. If you run out of water this indicates you are short on containment. If you intend to turn the system off regularly, additional water storage should be added (T40SP Expansion Reservoir).

9-3: Adjust the Fixed Skimmer as Needed

Adjust the Skimmer Height

Trim or lower the skimmer as needed to accommodate the pumping volume. You do not want the operating water level flowing over the top of the liner. The operating water level should be no closer than 2” from the top of the liner.

To Lower the Skimmer

The Fixed Skimmer is designed to be lowered in two ways. The Eccentric Coupling can be rotated to lower the operating water level (A), and for high flows the Fixed Skimmer opening can also be cut down (B). Either or both of these adjustments will lower the operating level of the pooling finish.

To Raise the Skimmer
To raise the skimming depth, simply rotate the Eccentric Coupling.

9-4: Final Tasks

Finish placing rock around the Fixed Skimmer. The Fixed Skimmer can be hidden with natural elements or finished with a Stainless Steel Grate (use the riser kit if there will be leaves falling into the stream).

Things to check:

• Make sure all stainless steel clamps have been tightened before backfilling.

• Make sure all water flowing down the stream is contained within the liner.

• Make sure there is at least 2” between the top of the liner and the operating level of the pooling finish. If not, raise the liner accordingly, shorten the height of the skimmer, or reduce the pumping volume.

• Make sure that the system can be turned off and then turned back on without having to add water.

• Make sure that the terrain around the Filter Tank Reservoir is graded so surface water does not collect around the unit.

10-1: Install the Auto-fill, Pump Shut-off, and Accessories

If you are installing an Auto-Fill device and a Pump Shut-off, make sure the Auto-Fill is positioned above the Pump Shut-off level so water can be added before the pump switch turns the pump off. If the Auto-Fill is positioned too low it will never have a chance to
add water.

For installation instructions refer to instructions included in each kit.