Choosing your pump for Multi-use spillway
(Different flow rates required for Projecting
sheet & sheet descent)
|
 Projecting sheet mode (Maximum 75mm
projection from the wall) |
| |
PUMPS: How to choose : A projecting sheet spillway requires a flow of at least 850
Litres per hour for every 100 mm of spillway width. While a sheet descent sheet 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 surface 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 1.0m mounting, covering a variety
of price points. The (list starts with the best quality and works right). *The higher the water is being pumped, the larger the pump must be, also on
2 and 3 inlet spillways the flow must be higher because of the tee that is
required in the plumbing.
|
Potential pumps*
When used as a sheet descent (softly down the wall) |
Spillway
length |
Min flow rate required at the spillway -
litres per hour |
Pump
Location |
Based on about 1000mm mounting height**
** Head,
the distance between the top of the water in the pond and the mounting height of the spillway. |
| 300 |
1,050 |
Inside
pond |
Pondmate 1500 Oase Neptun 2000 |
| Outside pond |
Pondmate 1500 Oase Neptun 2000 |
| 600 |
2.100 |
Inside pond |
Pondmate 3500 Laguna MaxFlo
4000 Oase Neptun 3000 |
| Outside pond |
Pondmate 3500 Oase Neptun 3000 |
| 900 |
3,150 |
Inside
pond |
Pondmate 4800
Oase Neptun 4000 |
| Outside pond |
Pondmate 4800 Oase Neptun 4000 |
| 1200 |
4,200 |
Inside
pond |
Pondmate 6000
Laguna Maxflo 5000 Oase Neptun 6000 |
| Outside pond |
Pondmate
6000 Pondmate 6000DWP |
| 1500 |
5,250 |
Inside pond |
Pondmate 6000 Laguna MaxFlo
7500 Oase Neptun 6000 |
| Outside pond |
Pondmate 6000 Oase Neptun 6000
Pondmate 6000DWP |
|
Potential pumps* When used as a projecting sheet (sheer descent - not touching the wall) |
| Spillway length |
Min flow rate required at the spillway -
litres per hr |
Pump
Location |
*Based on about 900mm mounting height**
**Head,
the distance between the top of the water in the pond and the mounting height of the spillway. |
| 300 |
2,550 |
Inside pond |
Pondmate 3500 Laguna
Maxflo 5000 Oase Neptun 4000 |
| Outside pond |
Pondmate 3500 Oase Neptun 4000 |
| 600 |
5,100 |
Inside
pond |
Pondmate 6000 Laguna
Maxflo 7500 Oase Neptun 6000 |
| Outside pond |
Pondmate 6000
Oase Neptun 6000 |
| 900 |
7,650 |
Inside
pond |
Pondmate 8500 Laguna Maxflo 9000 Oase Neptun 9000 |
| Outside pond |
Pondmate 8500 Oase Neptun 9000 |
| 1200 |
10,200 |
Inside
pond |
Laguna Maxflo 11000 Pondmate 15000 DWP Oase Neptun 12000 |
| Outside pond |
Pondmate 15000 DWP Oase Neptun 12000 |
| 1500 |
12,750 |
Inside
pond |
Pondmate 15000DWP Laguna Maxflo 16000 |
| Outside pond |
Pondmate 15000 DWP |
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 50cm 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 |
|
Spillway plumbing kits
available - Click for options |
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