Right sizing a water meter is ...

Right sizing a water meter is an important decision. If you oversize you will lose revenue at lower flow rates where large meters aren't accurate. If you undersize, you may get pressure or flow rate complaints. It is always better to undersize unless the flow rate is for fire protection or some machine that needs a particular high flow rate. you can always upside if there is a customer complaint. However, they will never complain if oversized and they are getting free water at low flow rates. New smart meters can data log average and high flow rates to determine the needs in actual use. start at the low end and If you find the meter is wrong sized, pull it out and move that meter elsewhere. you can add up fixtures and the flow rate of each to determine maximum if ALL were running at once. However, it's more likely only a few will run at a time.