A long narrow excavation is a type of construction project that involves digging a TRENCH or channel in the ground. The two most common terms for this type of excavation are 'FOSSE' and 'DITCH'. FOSSE is a French word meaning 'DITCH' or 'TRENCH', while DITCH is an English term for a long, narrow excavation. Both terms are used to describe a long, narrow excavation that is typically used for drainage, irrigation, or other purposes.