Daily Water Watch: Carraízo at 39.01 Meters

Day 29 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 39.01 meters — down 8 centimeters from yesterday, and La Plata at 44.54 meters — down 3 centimeters from yesterday.

This is the 26th 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: down 8 cm

Carraízo kept sliding. This morning’s chart puts it at 39.01 meters — down 8 centimeters from yesterday, in the observación band. The next line on the chart — into the ajustes band — sits at 38.50 meters, 0.51 meters below this morning’s reading. At AAA’s printed pace that is roughly 6.4 days out (straight-line date: 2026-09-12 — a projection, not a forecast; one wet afternoon moves it).

La Plata: down 3 cm

La Plata kept sliding. This morning’s chart puts it at 44.54 meters — down 3 centimeters from yesterday, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 4.04 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.

What the numbers say

Carraízo has swung hard this week, averaging a 32.3 cm-a-day rise after falling 4.5 cm a day the week before — a clear reversal, driven largely by a single 172 cm jump the morning after 1.14 in of rain fell on September 1. The reservoir now sits at 39.01 m in the observación band, 0.51 m above the ajustes line below it. At this week’s pace, the arithmetic points to the seguridad line (39.70 m) in about 2 days, around September 8, though the last two mornings have actually ticked down, a reminder that one big rain event can skew a weekly average. La Plata’s decline continues to slow, from 8.7 cm a day to 3 cm a day, with the level at 44.54 m in the ajustes band, 4.04 m above the control line. Holding that pace, the arithmetic puts the control line about 135 days out.

Cidra has also reversed course, rising 2.5 cm a day versus a 1.2 cm-a-day drop the week before, after picking up 6.3 in of rain this week, the most of the three reservoirs. It sits at 400.17 m in ajustes, 1.80 m above control, and at this week’s rate the arithmetic puts the observación line (400.23 m) about 2 days out, near September 8. Rain responses at both Carraízo and Cidra show measurable next-morning gains following wet days, while La Plata’s single wet day preceded a further small drop, underscoring how unevenly rainfall is translating into recovery across the three basins.

What to watch

• Carraízo: whether the rise survives a dry week — this week’s gain came with 2.64 in of rain nearby.
• La Plata: whether the slowdown holds — a second week under 8.7 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 6.3 in of rain nearby.

The other rationing reservoir

Numbers from AAA’s Monitoreo Diario chart of 2026-09-05, 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.