As the most simple reliable and cheap way to provide control over filling the tank?

Introduction: there is a water station located on the Kamchatka Peninsula in the small village. Withdraws water from the river and pumping into a reservoir from which gravity is used to supply consumers. The reservoir is located 3 km from the village and from the station, electricity is not fed back. Currently, the pumps are just "spout", you need to make the system controlling the filling to the level and maintain it. Cellular communication is not reliable, to lay a cable supposedly is too expensive.

UPD: the solution should be energy efficient pumps at 100 kW, twist them wasted on a bypass would not be desirable.
UPD2: diameters there is not domestic, if you put a mechanical valve you need roughly du200
June 10th 19 at 15:52
5 answers
June 10th 19 at 15:54
The tank of the toilet saw?
Yes, this option is also considered, locking mechanical valve and stop the pump at high pressure. The question of reliability. If the pumps don't stop - get energy (they will work through the valve on the bypass). - Austin13 commented on June 10th 19 at 15:57
Yes quite a reliable. Afraid - do the electronics on the level of drainage, or as it there - in short if the valve is not closed. - nicklaus commented on June 10th 19 at 16:00
and some kind of reference on the industrial valve like this (preferably stainless steel) is not present? It's not plumbing pipe DN20, we need at least Ду250 or 300. - Austin13 commented on June 10th 19 at 16:03
instead of mechanical constipation the same can be done with a blunt closing/opening the contacts of the reed switch, relays... anything. - Lurline commented on June 10th 19 at 16:06
I honestly do not get it. But just what you describe - it's stupid toilet tank to scale. I think you can try to look for where we sell water reservoir tanks for all houses and other things. - nicklaus commented on June 10th 19 at 16:09
carefully. Tank power no wiring to it is not paved. Would be easy to place sensors and to power them from the pump wouldn't be a problem. - Austin13 commented on June 10th 19 at 16:12
the easiest way float, pressing the button.
the minus button can freeze to sacralise or something like that.

option 2 (already suggested): float, the float magnet (powerful neodymium from China) the reed switch (sealed contact) + reluse, because the reed switch should not switch a large current (burn tries) to reluse already turns on and off the pump.
the scheme will be very resistant to external influences. if the mechanism is not saladine/shit clogged, will work as a watch.

plus I would advise to make the elements of hysteresis, so the pump is less likely to be included/switched off - you'll live longer. - Sandra_Kautzer42 commented on June 10th 19 at 16:15
AAA, I just don't understand that the pump far from the reservoir. - Lurline commented on June 10th 19 at 16:18
message my one above, please read. - Austin13 commented on June 10th 19 at 16:21
, pull to tank two-wire cable (from the usual 220 volts), at the end hang the reed switch. the current signal from the reed switch very powerful, far you can stretch.
90% will work.

if went such details describe the problem more precisely, and then we're in REN a long time to play here. - Sandra_Kautzer42 commented on June 10th 19 at 16:24
June 10th 19 at 15:56
What is the period of arrival to the site You want? Or want to be powered by solar panels?
June 10th 19 at 15:58
Is there line of sight between pump and tank?
The required height of the antenna to obtain line of sight?
The intensity of the sun and wind in the area of the tank?

The easiest and cheapest way: put on the tank electronics, to power it from the battery+SES/VES and radio to give as a pump.
June 10th 19 at 16:00
Look at the top of the tank to make a hole and in the hole to clog the hose leading to the river. When the water reaches this hole, it will automatically flow into the river! And the pumps cut off when the hose will the water! That's all!
June 10th 19 at 16:02
The water level sensors with controller for battery charging from solar panels, and the radio channel to transmit data

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