The Watershed Management Group has a one-week design school The price is steep — but scholarships are available. Included is training on constructing Ferro cement tanks. Great stuff for dry lands with a rainy season.

https://watershedmg.org/civicrm/event/info%3Freset%3D1%26id%3D908

(Thanks to Judy, a CHE specialist, for sleuthing this out!)