Day 27 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 39.11 meters — up 19 centimeters from yesterday, and La Plata flat at 44.59 meters.
This is the 24th 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 39.11 meters — up 19 centimeters from yesterday, in the observación band. The next line on the chart — into the ajustes band — sits at 38.50 meters, 0.61 meters below this morning’s reading.
Carraízo · September 3
- Level today
- 39.11 mband: observación
- Change since yesterday
- +19 cm
- To the ajustes line
- 0.61 mline at 38.50 m
- At the current pace
- rising
La Plata: holding
La Plata held its level. This morning’s chart puts it flat at 44.59 meters, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 4.09 meters below this morning’s reading.
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 3
- Level today
- 44.59 mband: ajustes
- Change since yesterday
- 0 cm
- To the control line
- 4.09 mline at 40.50 m
- At the current pace
- holding
What the numbers say
Carraízo has swung sharply upward, gaining an average of 31.8 cm a day over the past week after falling 4.3 cm a day the week before — a clear reversal, not just a slowdown. Four straight higher mornings added 204 cm, with most of that jump tied to a single event: the 1.14 in of rain on September 1 was followed by a 172 cm rise the next morning. At 39.11 m in the observación band, Carraízo sits 0.61 m above the ajustes line and, at this week’s pace, the arithmetic points to the seguridad band in about 2 days, around September 5.
The other two reservoirs are moving more quietly. La Plata continues to drop, but the decline has eased to 5.7 cm a day from 7.5 cm a day the week before, and at that slower pace the control line remains roughly 72 days out, around November 14. Cidra has flipped from a mild 0.8 cm-a-day decline to a mild 1.8 cm-a-day rise, aided by 6.27 in of rain this week, the most of the three reservoirs; holding that pace, the arithmetic puts it near the observación line in about 3 days, around September 7.
What to watch
- Carraízo: whether the rise survives a dry week — this week’s gain came with 2.24 in of rain nearby.
- La Plata: whether the slowdown holds — a second week under 7.5 cm a day would say the rotation is doing its job.
- Cidra: whether the rise survives a dry week — this week’s gain came with 6.27 in of rain nearby.
The other rationing reservoir
Cidra · September 3
- Level today
- 400.17 mband: ajustes
- Change since yesterday
- 0 cm
- To the control line
- 1.80 mline at 398.37 m
- At the current pace
- holding
Numbers from AAA’s Monitoreo Diario chart of 2026-09-03, 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.