Hi @dgw_awf, welcome back to the forums!
The clearest possibility for this is if the climate equation from the User’s Guide. It looks like the \omega(x) parameter is calculated by a linear function that includes Z, but then the User’s Guide also says this:
Z is an empirical constant, sometimes referred to as “seasonality factor”, which captures the local precipitation pattern and additional hydrogeological characteristics. It is positively correlated with N, the number of rain events per year. The 1.25 term is the minimum value of ω(x), which can be seen as a value for bare soil (when root depth is 0), as explained by Donohue et al. (2012). Following the literature (Yang et al., 2008; Donohue et al. 2012), values of ω(x) are capped to a value of 5.
My guess is that the calculated \omega(x) is consistently greater than 5 given the Z, PAWC and Annual Precipitation inputs provided.
Hope this helps!