The right choice of pump for garden irrigation
There are various types of water pumps for garden irrigation on the market. The pumps differ both in terms of their design and their performance data. Water pumps for great depths, such as well pumps, are usually offered as submersible pumps. A submersible pump is also a good choice for cisterns, as this makes it easy to achieve floating water extraction. Domestic waterworks, which can also draw in water several meters away, are installed in a dry location, e.g. in the house or cellar. Due to physical limitations, the maximum depth at which the water can be drawn from is approx. 8 metres. The performance data of the water pump indicate the delivery head or the maximum delivery pressure respectively.
Reading the characteristic curve of water pumps and determining the pumps' operating point
Pumps for cisterns and wells can be selected on the basis of the characteristic curve which you can find in the technical data or the operating instructions of the manufacturer. The performance of the water pump should match the size of your garden and your irrigation project. It is important to determine the optimal operating point for the pump in terms of head and pump pressure. For example, if the well is 10 m deep, at least 1 bar of pressure must be generated to overcome the difference in height between the water level and the ground Surface.
If the irrigation is to be fed by the garden pump at 3.5 bar, then 3.5 bar pressure is added to the 1 bar pressure. So the pump must build up 4.5 bar pressure. But what volume of water can the pump deliver at the required 4.5 bar pressure? This is exactly where the characteristic curve of the water pump comes into play. In the characteristic curve, 4.5 bar pressure corresponds to a delivery head of 45 meters (10 meters per bar). For this value, you can now see the volume that the pump can deliver on the X-axis of the pump's characteristic curve. The pump performance diagram thus shows exactly whether the pump is suitable for your irrigation project.
Submersible pumps, waterworks or well pumps - How does the circuit work?
There are water pumps with built-in pressure sensors that start as soon as water is drawn. If the pump you have selected does not have such an automatic system, you will also need an external press control. Alternatively, you can use a pump start relay to start the pump directly via the irrigation controller as soon as you want to start watering your garden.
A pump relay, a start box and a filter are also required for operation. Whether tap water, well water or cistern water: filters reliably protect your irrigation system from limescale, sand and organic material and thus ensure that your garden irrigation can function reliably.
You can order the perfect water pump for your garden irrigation project at the best value for money in the DVS Beregnung online shop.