Irrigation leak detection in Arcadia

The City of Phoenix describes the village containing Arcadia as enriched with long-standing established neighbourhoods with flood irrigated lots, in areas which once were occupied by citrus groves. That history is still in the ground, and it is what makes an irrigation leak here a different question from a sprinkler fault.

Irrigation leak detection in Arcadia usually means finding where water is escaping from privately owned ditches, gates or buried lines downstream of an SRP delivery point, on a lot originally laid out to be flooded.

The delivery-gate and containment points are Salt River Project's own published description of how flood irrigation works in the Phoenix area; the neighbourhood description is the City of Phoenix's.

Where does SRP's responsibility end on a flood-irrigated lot?

At the delivery gate. SRP controls the canals and laterals and its staff, the zanjeros, open the gates; from that point the water is carried to each property through ditches, channels or pipelines that are owned, operated and maintained by the homeowners themselves, who are also responsible for containing all the water on their own property.

That single line settles most of the ownership questions people arrive with. If water is going somewhere it should not after the gate opens, the system it is escaping from is private, and so is the repair.

What does a leak look like on a system like this?

Usually as water that arrives somewhere it was never meant to, or fails to arrive where it should. A gate that no longer seats, a collapsed section of buried delivery pipe, a breached berm, or a standpipe losing water below grade will all shift a delivery away from the part of the lot it was supposed to flood.

Because the water is not pressurised in the way a sprinkler main is, the sound signature is different and the timing matters more. Much of the evidence comes from watching a delivery actually happen and from what the ground does over the following days.

Is a damp wall or footing the irrigation or the house?

It depends on whether the damp keeps time with the deliveries. Water flooded onto a lot soaks the ground against footings and walls, so damp that appears with a turn and eases over the following days is behaving like irrigation; damp that stays constant regardless is behaving like a pressurised leak.

The supply system settles it. Gauged with everything closed, a system that holds pressure is not the source, and the search moves outdoors. See slab leak detection in Arcadia for the other half of that question.

What about the drip and sprinkler systems layered on top?

They are a separate system and they fail in their own way. Many Arcadia lots run drip or sprinklers alongside the flood delivery, and a pressurised landscape line leaks continuously rather than on a schedule, which is what makes it show up on the water bill while the flood system does not.