Hi all, 
What sort of documentation do you submitt to demonstrate no need for irrigation in international projects? (i.e. we don´t have a tool like the USDA hardiness zones)
I am supplying monthly rainfall rates and days with rain, and a general characterization of planting material (non-natives used for xeriscasping and  natives that naturally grow on drier zones of the same eco-region).
We have been doing no-irrigation landscapes for more than 14 years, and I know our designs will work, I just don't know how to clearly convey it to the reviewer. 
Initial watering will be done by hand with hose bibs for a period of one year. Project is located in a tempered humid zone. 
There's little to no guidance on this path. 
Thanks!