Recently we got a chance to install a data logger on the main water meter in a normal block of flats in Boyana, Sofia.
We installed the device on 1th of April – right in the beginning of spring.
Our logger has been attached to a water meter generating one pulse per cubic meter of water so each dot on the graph is 1m3 of water.
The system immediately detected a couple of cubical meters that were consumed each day in the morning between 5 and 8 am.
You see that on 1th of April there was no issue but on 2th and 3th 4m3 of water has been consumed.
We signaled the issue immediately as high consumption.
The customer has found that the irrigation system has been switched on. There was nothing bad with that however in April the weather in Bulgaria is quite rainy and is absolute waste of water to have irrigation working.
The customer has found an issue with the moisture sensor. It should not trigger the system in those conditions but it did.
Replacing the sensor fixed the issue. The result was quite a nice graph showing normal consumption.
Here you can see the effect on average from switching off the irrigation system.
On the left you see how does the average (dark blue) fits well with the pattern of irrigating and on the right you see how the consumption declined and now is way under the average.
The result ? For just 10 days we have saved to that block of flats about 4×10=40 m3 of water which in money is around 100 bgn almost as much as the cost of our service per year.