Water flow meter project

My garden suffered from not having water. My sensors for measuring the water level has quit working. The plan now is to put a float in the reservoir to maintain a constant water level. Now to determine how much nutrients that each week I need to know how much water has been added. I have found a way of doing this using a water meter and my raspberry pi.https://learn.adafruit.com/adafruit-keg-bot/bill-of-materials this will help me set up the software on the Raspberry Pi to read how much water has been added. I have purchased all the materials needed for this experiment. Hopefully, this will be easy to implement and could be used by other growers. In the meantime, I have purchased a digital water meter that I can read manually. I also bought a new filter to use for this year.

piUpdate:  I purchased a 5-inch monitor for the raspberry pi. It works well.