Day 34 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 39.07 meters — up 5 centimeters from yesterday, and La Plata at 44.24 meters — down 8 centimeters from yesterday.
This is the 31th 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 39.07 meters — up 5 centimeters from yesterday, in the observación band. The next line on the chart — into the ajustes band — sits at 38.50 meters, 0.57 meters below this morning’s reading.
Carraízo · September 10
- Level today
- 39.07 mband: observación
- Change since yesterday
- +5 cm
- To the ajustes line
- 0.57 mline at 38.50 m
- At the current pace
- rising
La Plata: down 8 cm
La Plata kept sliding. This morning’s chart puts it at 44.24 meters — down 8 centimeters from yesterday, in the ajustes band. The next line on the chart — into the control band — sits at 40.50 meters, 3.74 meters below this morning’s reading. At AAA’s printed pace that is roughly 46.8 days out (straight-line date: Oct 27 — 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 10
- Level today
- 44.24 mband: ajustes
- Change since yesterday
- -8 cm
- To the control line
- 3.74 mline at 40.50 m
- At the current pace
- ≈ 46.8 daysstraight-line date: Oct 27
What the numbers say
Carraízo has essentially leveled off, sliding just 0.3 cm a day over the past week after a much steeper 31.8 cm-a-day climb the week before — a sharp deceleration, not a reversal, since it’s still 154 cm above where the rotation started 32 days ago at 37.53 m. The reservoir sits at 39.07 m in the observación band, 0.57 m above the ajustes line, and this week’s rain, including 0.95 in on September 7, didn’t lift it — the next morning actually read -4 cm. La Plata continues its steady decline, down 5.5 cm a day this week, nearly identical to the prior week’s 5.7 cm-a-day pace, with seven straight lower mornings totaling -35 cm. It has dropped 214 cm since the rotation began and sits 3.74 m above the control line at 44.24 m; at the current rate the arithmetic puts it near that line around November 17, roughly 68 days out. Its 0.55 in of rain on September 9 was followed by a further 8 cm drop.
Cidra is the one exception, edging up 0.8 cm a day this week, slower than the prior week’s 1.8 cm-a-day gain but still moving in the right direction, up 9 cm since the rotation began. It remains 1.85 m above the control line at 400.22 m. With 4.53 in of rain this week, including 1.57 in on September 10, Cidra has shown modest positive responses to wet days — +2 cm and +4 cm on prior instances — though the movement stays within a slow, flat-leaning trend overall.
What to watch
- Whether the pattern of the past week holds: the daily reading is the point.
The other rationing reservoir
Cidra · September 10
- Level today
- 400.22 mband: ajustes
- Change since yesterday
- +4 cm
- To the control line
- 1.85 mline at 398.37 m
- At the current pace
- rising
Numbers from AAA’s Monitoreo Diario chart of Sep 10, 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 Aug 8, 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.