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Pumps for "Deluxe Cascading descent" spillways


How to choose your pump: A cascading spillway requires a flow of at least 350 litres per hour for every 100 mm of spillway width. This flow rate is measured at the spillway, therefore in choosing the pump, the distance* between the top of the water and the spillway is a factor that only you will know. We have therefore made a number of suggestions below based on about 1.5m mounting covering a variety of price points. *The higher the water is being pumped, the larger the pump required.

Spillway
length

Minimum flow rate required at the spillway

Pump location Potential pumps based on about a 1.5m mounting height*
*Choice of pump will depend on the head** (pumping height)
600mm 2,100
litres per hr
If inside
pond
Pondmate 3500  Laguna Maxflo 4000 Oase Neptun 4000  
If outside
pond
Pondmate 3500   Oase Neptun 4000
800mm 2,800
litres per hr
If inside
pond
Pondmate 4800  Oase Neptun 4000  Project Easy Jet 4000
If outside
pond
Pondmate 4800  Oase Neptun 4000  
1000mm 3,500
litres per hr
If inside
pond
Pondmate 6000 Laguna Maxflo 5000  Oase Neptun 5000
If outside
pond
Pondmate 6000  Oase Neptun 5000
1200mm 4,200
litres per hr
If inside
pond
Pondmate 6000  Laguna MaxFlo 7500  Oase Neptun 6000 

If outside
pond

Pondmate 6000  Oase Neptun 6000
1500mm 5,250
litres per hr

If inside
pond

Pondmate 8500  Laguna MaxFlo 7500  Oase Neptun 6000****   ***A little under size
If outside
pond
Pondmate 8500  Oase Neptun 6000****   ***A little under size

1800mm

6,300
litres per hr

If inside
pond
Pondmate 8500  Laguna Maxflo 9000 Oase Neptun 9000***
***A little oversize
If outside
pond
Pondmate 8500  Oase Neptun 9000***  
***A little over size

2400mm

8,400
litres per hr

If inside
pond
Pondmate 10000DWP  Laguna Maxflo 11000 Oase Neptun 9000****
Oase Neptun 12000   ****A little under size
If outside
pond
Pondmate 10000DWP   Oase Neptun 9000****  Oase Neptun 12000   ****A little under size

Aussie says

**Head, the distance between the top of the water in the pond and the mounting height of the spillway.
Tip 1: If being used as a projecting sheet effect, never mount higher that 900mm above the water. The further the water drops, the narrower it becomes due to surface tension. The drop in the photo's above is .9m to give you an idea. Another way to understand this tapering effect is that for every 50 cm of drop, the width of the sheet of water narrows by about 100 mm. After about 90cm of drop the sheet starts to break up.
Hint 2: Any elbows or tees in the system will reduce flow. On the 2 inlet model spillways, it may be desirable to use two pumps, this will avoid the need for a tee.

Hint 3: Glass .. When water is run down glass, to improve water flow and maintain it's full width you should angle the wall between 2 to 5 degrees

Hint 4: Acrylic .. When water is run down Acrylic, to improve water flow and maintain it's full width you should angle the wall between 5 to 7 degrees

Hint 5: How to neatly get the electrical cable from the pump and the water tube out of the pond cleanly and allow for service. Click here