Up hill patio Oehler PSP

I have Mikes entire collection of books and DVD,S. I am not able to find dimensions or plans for the up hill patio as a reference. I am building an underground house strictly according to Mikes PSP. I want to also convert the up hill patio into a greenhouse. The space for the up hill patio measures 5 meters length and 3 meters width. What would be an acceptable rise and going for the up hill terrace considering I will be using these terrace steps to grow plants? I will be adding separate steps in the corner for human traffic. Any help would be appreciated.

I don't know much about dimensions or plans for the up hill patio though I thought google might have an answer.  These relate to retaining walls though I feel the concept might be very similar.

This one:  https://www.allanblock.com/retaining-walls/building-terraces.aspx

Has an equation in the article and a video.




Here is another that might help:

http://handbook.dcoz.dc.gov/zoning-rules/general-rules/retaining-walls/




Here are some threads that might help:

https://permies.com/t/129949/aspects-Permaculture-work-Hillside-Terrain

https://permies.com/t/129562/Stop-erosion-steep-shaded-sand