Pumps for "Deluxe sheet descent"
spillways
|
How to choose your
pump: A sheet descent spillway requires a
flow of at least 350 litres per hour for every 100mm
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 |
Min 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 3500
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 6000
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
60800
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
8600
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
10000
Laguna MaxFlo 11000
Oase Neptun
9000****
Oase Neptun
12000 ****A little under size |
If outside
pond |
Pondmate
10000
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 50cm of drop,
the width of the sheet of water narrows by about 100mm.
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 |
