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CorbelArchThecorbelarchdiffersfromatruearchinthatthe
corbelusescantileveredblockstobuildthearchandtherefordoesnothaveakeystone.
Itisaweakerdesignandgenerallylimitsthebuildertoahigher,narrowerarch.Thebenefitisthatifyouonlyhadasmallcreektocrossandflatrocksasamaterialitwouldbeaneasycrossingtomake.