Well for garden irrigation

Information about the drilled well: The neighbor said his was drilled 7.5 meters deep. Flow rate 4500 l/h :oops: cost 600€ two years ago... I had already mentally prepared to drill myself this afternoon. Now after the conversation, I am back to 50/50.

Hello everyone,
in the last few days, a well driller was here who has already drilled wells in the neighborhood. He said that drilling a well in the soakaway shaft would be possible.
The water is at 7m with us. The soakaway shaft is 4m deep. => he would "only" have to drill 3-4 meters. According to his experience, we should be able to pump 3-4 m³/h. He wants 600 for it. He only has time in 2-3 months... I agreed anyway.

Now I am in the process of planning and preparing everything.
- I already have electricity in the shaft
- Now a 4m deep ladder must be installed, which I will attach to the shaft wall
- Decision on pump type: house water automatic or waterworks? What I have read so far => house water automatic with pressure switch (integrated in the pump or separate)
- Pump position: Not exactly on the bottom of the shaft, because last summer I did not observe whether the water rises there during heavy rainfall or still seeps in directly.
In other words, I would hang the pump about 1m above the bottom (then the pump would have to suction from about 4 meters below and then pump up 3 meters)

I imagined it like this: the pump is always on and pumps against the closed valve. => If closed, nothing flows, but pressure is maintained. I control this closed valve(s) with actuators from Hunter and operate them remotely open and closed. When the valve is opened, the centrifugal pump in the soakaway shaft pumps water into the respective circuit to the gear sprinklers. Valve closed -> end of irrigation.

=> Is this feasible? Does the pump break quickly because it is always on? How is the water refilling for the centrifugal pump? I have never had a centrifugal pump before. Is the water refilling a one-time process at commissioning or do you have to do it weekly/monthly? That would be inconvenient because then I would always have to go down into the shaft. Do you then also need an expansion tank, like with heating? Is this even feasible with a drilled well and a centrifugal pump? Or is this only possible with well drilling and a high-pressure pump?

Please provide suggestions, corrections.
Thanks in advance.

Attached is the sketch of the shaft

Gardena is the wrong choice. Install a well pump like the one from Tipp.

: Thanks for the tip, I’m now considering the Tipp 4400. I had the idea to also put the valve box in a shaft. Now I wanted to roughly determine the number of zones. What’s still uncertain is the throw distance of the sprinklers. In other words, at what intervals should I place them. For example, if I take the Hunter I20, it says throw distance 4.9-14 m. What mainly affects the throw distance in practice? The chosen nozzle or the pressure in the pipe from the pump? How should I proceed in this example? If the throw distance is between 4.9 and 14 meters, at what distance do I place the next sprinkler?

Use a proper well pump like the Tipp 30082 AJ4 plus. The Tipp 4400 is not exactly impressive when it comes to pressure and flow. I recommend the sprinklers from the MP Rotator series. All have the same housing (preferably the pressure-regulating ones) and only different heads. i20 or similar have higher water consumption and also require more planning (flow rate, precipitation rate, etc.). Regarding the arrangement of the sprinklers, I have already written quite a bit in other threads. The sprinklers must overlap each other. That means with a 5-meter throw distance, the next sprinkler would be just under 5 meters away. With pressure-regulating housings, only the sprinkler head matters. This allows for a more homogeneous precipitation. You should have at least 2.8 bar at each sprinkler. Pipe preferably with DN32 PE-HD pipe. Valves should have the same diameter. This results in fewer losses in the lines. A sketch would make it easier to make more precise statements.

insert a sketch afterwards. Regarding the pump: since I will have a dug well, I cannot use deep well pumps. Only domestic water pumps. The TIP4400 has a max of 4.4 bar and 4200 l/h, Gardena 5000/5 at 5 bar and 5000 l/h. Since the well is not finished yet, I don’t know how much I can pump max, independent of the pump. According to the well builder’s experience, 3000-4000 l/h should be possible. Therefore, both pumps would work, the difference would be in the pressure in the pipe.