Adjustable flush Valve Calculations

Hi Chris, Are you talking about existing toilets with screws that regulate flush? In that case, I would recommend to perform a water audit for 20% of the fixtures and make sure these are all adjusted to product specs.

Chris, it sound like you're also hinting at the fact that the building owner could potentially game their WEp1 performance by using the most efficient flush rates that the valves can provide in the prerequisite calculations and then go back after the fact and reset the flush valves to use more water than initially reported. I'm not sure why the building owner might want to do this, unless a) they don't pay for water or pay very little for water (which is common) and/or b) they have occupant or maintenance compliants about the performance of low-flow, high-efficiency fixtures. To answer your question, GBCI reviewers will take your submitted documentation at face value, as long as you can provide cut sheets that verify the technical data used in your calculations. However, the whole LEED EBOM system depends on the customer providing accurate certification documentation in good faith to GBCI. If this is just something you're curious about, these are my thoughts and feel free to do with them what you will. If the building owner has actually approached you with this question/plan, I'd suggest having a discussion with them about the basic environmental intent of this prerequisite and chat a bit about water scarcity issues that are becoming more and more relevant (and damaging) all over the world. Hope this helps.