Day 35 of the metro rotation plan — interruptions paused since September 2, plan still in force. This morning’s 5:00 chart from the Autoridad de Acueductos y Alcantarillados shows Carraízo at 39.20 meters — up 13 centimeters from yesterday, and La Plata at 44.14 meters — down 10 centimeters from yesterday.
This is the 32th entry in our daily chart check (yesterday’s is here), built the same way every morning — from AAA’s own numbers, read off its charts for our reservoir board.
Carraízo: a rise
Carraízo gained ground overnight. This morning’s chart puts it at 39.20 meters — up 13 centimeters from yesterday, in the observación band. The next line on the chart — into the ajustes band — sits at 38.50 meters, 0.70 meters below this morning’s reading.
Carraízo · September 11
- Level today
- 39.20 mband: observación
- Change since yesterday
- +13 cm
- To the ajustes line
- 0.70 mline at 38.50 m
- At the current pace
- rising
La Plata: down 10 cm
La Plata kept sliding. This morning’s chart puts it at 44.14 meters — down 10 centimeters from yesterday, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 3.64 meters below this morning’s reading. At AAA’s printed pace that is roughly 36.4 days out (straight-line date: 2026-10-18 — a projection, not a forecast; one wet afternoon moves it).
If your water comes from La Plata — Dorado, Guaynabo, Naranjito, Toa Alta, Toa Baja, Vega Alta, Bayamón, Cataño, Corozal — this is the reservoir to watch; AAA lists 130,828 client accounts on it.
La Plata · September 11
- Level today
- 44.14 mband: ajustes
- Change since yesterday
- -10 cm
- To the control line
- 3.64 mline at 40.50 m
- At the current pace
- ≈ 36.4 daysstraight-line date: 2026-10-18
What the numbers say
Carraízo’s climb has lost momentum: last week’s average gain is well below the pace of the week before, even though the reservoir is still up three straight mornings. Rain hasn’t been the driver of that slowdown in any simple way — the wettest day of the week was actually followed by a lower reading the next morning, a reminder that these swings don’t track rainfall one for one. Cidra shows the same broad pattern, gaining ground for three mornings running, though its rise has also eased slightly from the prior week’s rate. Both reservoirs remain in the observación band, close enough to the line below that their movement is worth watching even as they trend upward.
La Plata is the one clear concern this week. Its decline isn’t just continuing an eight-morning losing streak — it’s accelerating, with the latest weekly rate well past the pace of the week before. Rain fell nearby, but the mornings after the wettest days brought further drops rather than any relief, underscoring that showers alone aren’t turning this trend around. Arithmetic on the current rate points toward the control line months from now, not as a prediction but as where the present pace leads if it continues unchanged.
What to watch
- Carraízo: whether the rise survives a dry week — this week’s gain came with 1.82 in of rain nearby.
- Cidra: whether the rise survives a dry week — this week’s gain came with 4.48 in of rain nearby.
The other rationing reservoir
Cidra · September 11
- Level today
- 400.27 mband: observación
- Change since yesterday
- +5 cm
- To the ajustes line
- 0.04 mline at 400.23 m
- At the current pace
- rising
Numbers from AAA’s Monitoreo Diario chart of 2026-09-11, read each morning for our reservoir board — where the levels, the bands, and the live rain gauges update daily. Rain figures are USGS gauges within 12 km of each reservoir (a proximity proxy, not a basin measurement). Day counts start 2026-08-08, when the metro rotation took effect. Straight-line dates are arithmetic, not forecasts. The analysis paragraphs are drafted by Claude from the computed figures and checked number-by-number against them before publishing.