My wife’s Uncle has a house on an island which we frequent. I do a lot of maintenance on the house as the relatively young one, for the privilege of staying there. Water is supplied via cisterns. It seems (to me) that Man Friday got baked and left a hose running, draining 2/3rds of the water supply (12k gallons) and melting the plastic impeller on the water pump when it ran dry. No bueno in the current drought, but hurricane season should rectify things. I have installed a new, better pump with a brass impeller to rectify the run dry situation. And the remaining water in the backup cistern should be fine for now, and they can always buy water. But, I am looking for some sort of smart water leak shutoff valve that we can set up to stop when, say, 1000 gallons flow over 24 hours, to prevent future draining of the cisterns. Help?