Conversion gpm at 60psi

Hello Tatjana, I'm in France and had the same issue. I converted all the standard flow rates into litres (1 gallon = 3,78541178 Litres) to use as my reference rates. Then I converted psi to bar: 60psi is 4 bar and 80psi is 5.5 bar. I asked the manufaturer or provider for the flow graphs for each fixture. They show the flow rates from 1 to 5 (or 6) bars, which allows me to verify that the flow rates are respected at either 4 or 5.5 bars, depending on the fixture. Of course, once you have determined that you are within the water use limits, you have to reconvert all you flow rates fom L/min into gallons to complete the form. It's a bit tedious, but the equivalencies are there. What is important is to make sure you are calculating the flow at 4 and 5.5 bars since they are the reference for LEED, even if it is not the standard pressure for Germany (France is 3 bar as well). I hope that helps. And if you come up with a simpler solution, I will be happy to hear of it! Good luck Josephine