A submersible canal bypass is used to bypass the flow around a distinct
section of an earthen canal for lining. The canal bypass is placed within
the canal and uses a plurality of pipelines and a plurality of bulkheads
assembled from portable modular sections. The headgates on the portable
modular sections are so arranged along the bulkhead to divert the flow of
water through bypass pipelines so as to isolate a section of the canal
during lining activities and return the flow of water to the lined canal
after lining.