ᐅ Rainwater Harvesting Cistern for Garden Irrigation – Which Pump Should I Use?
Created on: 9 Sep 2020 14:49
D
DerGuteTon
Greetings!
I am gradually starting to plan the garden irrigation for my soon-to-be-completed house. For now, I want to keep it simple and non-smart: a cistern (6,000 liters) is installed underground, and I plan to water the garden conventionally using a pump and garden hose. The farthest lawn area will be reachable with about 35 to 40 meters (115 to 130 feet) of hose length. The cistern is located at the lowest point, about 2.50 meters (8 feet) underground.
Now I am facing a confusing variety of possible pumps: suction pump, dirty water pump, submersible pump, garden pump, deep well pump... several thousand liters per hour, various pressure ratings in bar... Does anyone have good advice?
I am gradually starting to plan the garden irrigation for my soon-to-be-completed house. For now, I want to keep it simple and non-smart: a cistern (6,000 liters) is installed underground, and I plan to water the garden conventionally using a pump and garden hose. The farthest lawn area will be reachable with about 35 to 40 meters (115 to 130 feet) of hose length. The cistern is located at the lowest point, about 2.50 meters (8 feet) underground.
Now I am facing a confusing variety of possible pumps: suction pump, dirty water pump, submersible pump, garden pump, deep well pump... several thousand liters per hour, various pressure ratings in bar... Does anyone have good advice?
OK, because every filter, elbow joint, length, etc. reduces pressure. Additionally, I have read that the sprinklers also consume pressure, so I was a bit confused.
Assuming I have 6 bar (87 psi) and 6 m³/h (26.4 gpm), which the system can handle. If I generously deduct 2 bar (29 psi) for pipe length, etc., that leaves 4 bar (58 psi). Roughly, how many sprinklers with 2.8 bar (41 psi) can I operate then?
Assuming I have 6 bar (87 psi) and 6 m³/h (26.4 gpm), which the system can handle. If I generously deduct 2 bar (29 psi) for pipe length, etc., that leaves 4 bar (58 psi). Roughly, how many sprinklers with 2.8 bar (41 psi) can I operate then?
How many sprinklers you can operate depends on the flow rate. A 5-meter (16 feet) sprinkler with a 360° coverage requires significantly more than a 90° sprinkler with a 1-meter (3 feet) throw distance. The length of the pipes also plays a role.
As a guideline, with 32mm (1.25 inch) pipes, you can safely assume a maximum flow of up to 2500 liters per hour (660 US gallons per hour). This also ensures you have sufficient pressure.
As a guideline, with 32mm (1.25 inch) pipes, you can safely assume a maximum flow of up to 2500 liters per hour (660 US gallons per hour). This also ensures you have sufficient pressure.
I am planning with a 32 and my pipe lengths will be around 15-50 meters (50-165 feet) from the distribution manifold. The distance from the cistern to the manifold is 20 meters (65 feet). Otherwise, there are almost 10 zones with about 35 sprinklers. The Tipp EP 6 delivers 5.7 bar (83 psi) and 6.3 m³/h (110 gallons per minute), which is good. I briefly considered using a pump with slightly lower pressure but higher flow rate. However, this should work.
I need to check how many zones I can run at the same time. There is about 250 m² (2,690 sq ft) of lawn covered by 4 zones, 5 zones for drip irrigation for hedges and raised beds, and 1 zone running continuously for water extraction.
I need to check how many zones I can run at the same time. There is about 250 m² (2,690 sq ft) of lawn covered by 4 zones, 5 zones for drip irrigation for hedges and raised beds, and 1 zone running continuously for water extraction.
I
immermehr19 Dec 2020 20:12Hello everyone,
I have been following this thread for a few months.
Last week, my groundworker installed the cistern.
Now the question remains about the hose. I want to run the hose to two locations (left and right). For this, I bought 50m (164 feet) of PE hose. My cistern cover is about 1m (3.3 feet) lower than my terrace. The groundworker says it has to be that deep because of the downspout. He suggested laying the KG pipe as a conduit.
Questions:
- How did you handle the T-connector (branching to two locations)? Or what do you recommend?
- How did you connect the PE pipe to a submersible pump? I’m concerned that the PE pipe is too rigid. Also, my current cistern cover is about 1m (3.3 feet) deep. This makes it a bit complicated with the submersible pump.
Thank you very much for your answers.
I have been following this thread for a few months.
Last week, my groundworker installed the cistern.
Now the question remains about the hose. I want to run the hose to two locations (left and right). For this, I bought 50m (164 feet) of PE hose. My cistern cover is about 1m (3.3 feet) lower than my terrace. The groundworker says it has to be that deep because of the downspout. He suggested laying the KG pipe as a conduit.
Questions:
- How did you handle the T-connector (branching to two locations)? Or what do you recommend?
- How did you connect the PE pipe to a submersible pump? I’m concerned that the PE pipe is too rigid. Also, my current cistern cover is about 1m (3.3 feet) deep. This makes it a bit complicated with the submersible pump.
Thank you very much for your answers.
Use the fittings from Unidelta. They offer all the variants you need, for example, a T-piece.
What type of PE pipe do you have?
You don’t need a conduit for the PE pipe.
Of course, you can connect a submersible pump to it. This type of setup is exactly what these are designed for. Again, Unidelta...
And it’s not complicated. I have a 63mm (2.5 inches) PE pipe on my submersible pump. It’s really rigid...
I assume you have a DN25 or at most a DN32.
What type of PE pipe do you have?
You don’t need a conduit for the PE pipe.
Of course, you can connect a submersible pump to it. This type of setup is exactly what these are designed for. Again, Unidelta...
And it’s not complicated. I have a 63mm (2.5 inches) PE pipe on my submersible pump. It’s really rigid...
I assume you have a DN25 or at most a DN32.
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