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The basic rule of thumb is that you need 100 GPH of flow for every 1 in. of width for your waterfall.
○ Example: if you have an 16 in. wide waterfall and the waterfall is at a height of 8 ft., then you need a pump
to be able to deliver 1600 GPH at 8 ft.
●
If you prefer a more subtle flow of water, cut the flow rate in half, making 50 GPH your target for every 1 in. of waterfall width.
●
If you prefer a more robust flow of water, double the flow rate, making 200 GPH your target for every 1 in. of waterfall width.
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Don’t forget to take friction loss into account when selecting the pump. Remember, this results from bends in the water flow such as an
elbow or bringing the flow through a pressure filter prior to delivering to the waterfall. For this reason it is recommended to use a
dedicated pump that is plumbed directly to the waterfall and a separate pump for filters and water features.
Spillway
width
Model
no.
Inlet size
Spillway dimensions
Target flow rate for a
subtle flow
Target flow rate for
a moderate flow
Target flow rate
for a robust flow
16 in.
45387
1 1/2 in.
20.7 x 18.5 x 11.3 in.
800 GPH
1600 GPH
3200 GPH
W
aterfall
Spillway with
Filtration
Pos.
Waterfall Spillway with
Filtration
16 in.
1
Spillway
2
Coupler
3
Gasket
4
Adapter
5
Bio-media with bag
6
Filter foam
7
Clip
8
Cover
9
Anchoring Flange
10
Screw
1
2
4
3
6
5
8
7
10
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