How to calculate drip line run lengths?
Use the equation in our Water Flow Rate Guide to calculate the flow rate from your tap. Then, use the below calculation to check if your water flow rate is sufficient to run your required length of drip line.
(Required length ÷ Dripper Spacing) x L/h Output from Each Emitter = Total Water Output Overall
Working Example: (50m ÷ 0.33) x 2 L/h = 303 L/h
If your required length is to water a 50-metre hedge row and your dripper spacing is 33cm emitting 2 litres per hour from each emitter, you would need a minimum flow rate from your tap of around 300 - 350 litres per hour.