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Choosing
a pump for a water garden should be based on a few job
requirements. Desired flow, pumping height and electrical
costs are all factors that need to be considered. The higher
a pump needs to push water, the less flow you are going
to get out of that pump. The pond kits come with pumps
sized to turn a pond over at least once an hour. If pumping
height is close to maximum pump shut-off height, substitute
the next larger pump available. Your pond is a living natural
ecosystem and requires a consistent flow of oxygen to stay
alive. The pump should be run 24 hours a day, 7 days a
week to keep the ecosystem functioning properly. To determine
the correct pump for your water feature, use the following
formula.
For each horizontal foot of waterfall, you need a minimum
of 1500 gph:
Examples:
1) A waterfall 2 foot wide will require a minimum 3000 gph
2) A waterfall 4 foot wide will require a minimum 6000 gph
To Determine Dynamic Head:
- Each 10' of horizontal run of pipe (any size) = 1 foot of head.
- Each 1' of vertical rise = 1 foot of head
Examples:
1) A 40' run of pipe + 8 feet of elevation = 12' of Dynamic Head (4+8).
A 2' wide waterfall would require 3000 gph at 12' head. Looking at the
flow chart, this would fall between the 3000 and the 4500 Pump. Always
upsize to the larger pump. For this example, you would use the Aquascape
4500 Pump (blue line).
2) A 50' run of pipe +20 feet of elevation = 25' of Dynamic Head (5+20).
A 3' wide waterfall would require 4500 gph at 25' head. Looking at the
flow chart, you would use the Aquascape 7500 Pump (green line)
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