south of the bay area diversions, the bulk of the swp water – ranging from per year – travels south along the western flank of the san joaquin valley through the california aqueduct. the main section of the aqueduct stretches for ; it is composed mainly of concrete-lined canals but also includes of tunnels, of pipelines and of siphons. the aqueduct reaches a maximum width of and a maximum depth of ; some parts of the channel are capable of delivering more than . the section of the aqueduct that runs through the san joaquin valley includes multiple turnouts where water is released to irrigate roughly of land on the west side of the valley.