damienc

cheers ed,

but i don't think the contrafuerte would have fitted as they are not necessarily reinforced for structural/physical retention of the slope, just runoff diversion...

anyway the text i settled on... (and already submitted!) went ".... construct crown trenches running down the ridge lines above exposed slopes to avoid slope failure induced by surface runoff.", with the bolded type added to reduce ambiguity.

thanks for the effort,
Damien