Daily Water Watch: Carraízo at 38.87 Meters

Day 31 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 38.87 meters — down 7 centimeters from yesterday, and La Plata at 44.46 meters — down 6 centimeters from yesterday.

This is the 28th 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 7 cm

Carraízo kept sliding. This morning’s chart puts it at 38.87 meters — down 7 centimeters from yesterday, in the observación band. The next line on the chart — into the ajustes band — sits at 38.50 meters, 0.37 meters below this morning’s reading. At AAA’s printed pace that is roughly 5.3 days out (straight-line date: 2026-09-13 — a projection, not a forecast; one wet afternoon moves it).

La Plata: down 6 cm

La Plata kept sliding. This morning’s chart puts it at 44.46 meters — down 6 centimeters from yesterday, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 3.96 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

Over the past week Carraízo has been rising an average of 27.8 cm a day, a reversal from a 3 cm-a-day decline the week before. That is 4 straight mornings lower, -24 cm in all. Since the rotation began 29 days ago it has gained 134 cm, from 37.53 m. It sits 0.37 m above the ajustes line (the next band down), at 38.87 m in the observación band. If this week’s rise held, the level would climb into the seguridad band above (line at 39.70 m) in about 3 days, around September 10. Nearby USGS gauges recorded 1.89 in of rain this week, most of it September 1 (1.14 in). After the 1.14 in on September 1, the next morning’s reading was +172 cm.

Over the past week La Plata has been falling an average of 2.2 cm a day, down from 9.3 cm a day the week before — the decline is slowing. That is 4 straight mornings lower, -13 cm in all. Since the rotation began 29 days ago it has lost 192 cm, from 46.38 m. It sits 3.96 m above the control line (the next band down), at 44.46 m in the ajustes band. At this week’s pace the control line (40.50 m) is about 180 days away; arithmetic, not a forecast. Nearby USGS gauges recorded 0.57 in of rain this week, most of it September 1 (0.35 in).

Over the past week Cidra has been rising an average of 0.5 cm a day. Since the rotation began 29 days ago it has gained 3 cm, from 400.13 m. It sits 1.79 m above the control line (the next band down), at 400.16 m in the ajustes band. The week’s net movement is inside chart-reading noise — effectively flat. Nearby USGS gauges recorded 3.33 in of rain this week, most of it September 1 (2.81 in). After the 2.81 in on September 1, the next morning’s reading was +4 cm.

What to watch

• Carraízo: whether the rise survives a dry week — this week’s gain came with 1.89 in of rain nearby.
• La Plata: whether the slowdown holds — a second week under 9.3 cm a day would say the rotation is doing its job.

The other rationing reservoir

Numbers from AAA’s Monitoreo Diario chart of 2026-09-07, 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.