Thanks, eide!
With the current hardware, I’m not sure if we can measure it. If you have an average value, it could do the trick. The entire farmware is ball parking it as it is 
Idea: Not sure if we have a microphone on board somewhere, if the USB camera has one, maybe we can listen to the water pressure? Not sure how to really build that, could be fun to figure out tho!
I’m thinking of pest control now, let me know if you have thoughts on the topic.