So far, it might be obvious that this aqueduct system is pretty fragile to be making up a major part of a city’s fresh water supply. Even beyond the vandalism and political resistance, there are a lot of things that could go wrong along the way, from bank collapses, earthquakes, diversion failures, and more. That’s why Haiwee Reservoir was originally built in a narrow saddle between two hills as a kind of buffer. With a dam on either side, it stored water up so the aqueduct could keep running even during a disruption upstream. It also slowed the water down, exposing it to the hot desert sun as a natural form of UV disinfection. In the 1960s, the reservoir was reconfigured into two basins to add some flexibility. That’s because, around that time, the LA aqueduct became two. While the open-topped canal section was large enough to meet demands, the underground conduit in the next section wasn’t. So, LA built a second one in 1970 to increase the flow. If you look at this map of the Haiwee Reservoirs, you can see that water has two paths: it can flow into the second aqueduct here from the north basin, or it can pass through the Merritt Cut to the south reservoir, through the intake there, and into the first aqueduct. This setup allows for some redundancy, along with regulation and balancing of the flows between the two aqueducts. Haiwee marks the start of the long desert run, with both systems no longer in open-topped lined canals, but running underground in concrete conduits.
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