This calculation gives a recommended flow-rate for the height and width of your waterfall, for your chosen thickness of water flow.

• Choose the thickness of water you want running over the top of your waterfall. Generally, the higher the waterfall, the thicker the sheet of water should be. Our suggestions are:

• Use the formula below to calculate the suggested flow-rate in Litres/Hour:
  • • Width of Waterfall (in metres) x Thickness (in mm) x 1450 (constant) = Flow in L/H

Example: 1. For a waterfall 1.0m high, choose 12.5mm thickness

• The waterfall is to be 0.8m wide.3. 0.8m (width) x 12.5mm (thickness) x 1450 (constant) = 0.8 x 12.5 x 1450 = 14,500 litres/hour
• Choose a pump that is capable of giving 14 500 L/Hr (or greater) at 1.0m head height. It is important to remember that the flow is at the height of the waterfall, so you need to look at the flow-charts to find a pump that can give this flow or preferably more, at 1.0m head height. To allow for friction losses etc., in pipework, it is best to always over-specify.