Water Week in Review: Carraízo Up 167 cm, Sep 13–20
Published Sep 20, 2026, 6:03 AM AST787daily · Original analysis
At a glance
Carraízo: 39.14 → 40.81 m (+167 cm) over 7 days — Safe band, 5.19 in of rain nearby in the final week
La Plata: 44.26 → 44.66 m (+40 cm) over 7 days — Adjustments band, 2.43 in of rain nearby in the final week
Cidra: 400.26 → 400.54 m (+28 cm) over 7 days — Watch band, 6.05 in of rain nearby in the final week
Week of September 13–20; 6 daily chart checks this week, all archived on our reservoir board
Why this matters: What the week changed is the distance to the next band line — 1.11 m for Carraízo, 4.16 m for La Plata — and the pace at which it is closing or opening.
The week of September 13–20 on AAA’s reservoir charts: Carraízo up 167 cm, La Plata up 40 cm. The numbers first, then what they add up to.
Week 7: where the reservoirs stand
Week 7 of the metro rotation · Where the 19 reservoirs stand as of Sep 20: each column is that reservoir's own ladder of AAA bands, the bar its level in meters, the dashed tick where it stood on August 8, day one of the rotation, the triangle this week's direction. Source: AAA's 5 AM readings; bands as AAA's monitoring chart defines them.
14 of 19 reservoirs sit in seguridad or above, 4 in observación; La Plata is in ajustes. Since August 8, Carraízo (ajustes → seguridad), Cidra (ajustes → observación), Matrullas (observación → seguridad) have moved up a band; La Plata (observación → ajustes) has slipped down. This week’s biggest move is Carraízo, up 1.67 m to 40.81 m.
At a glance
Carraízo
Sep 13 → Sep 20
39.14 → 40.81 mSafe band today
Net change
+167 cm23.9 cm a day on average
Best morning
+83 cmSep 17
Worst morning
−2 cmSep 16
Rain nearby, last 7 days
5.19 inmost on Sep 16 (2.21 in)
Above the observación line
1.11 mrising — desborde line ≈ 1 days up
La Plata
Sep 13 → Sep 20
44.26 → 44.66 mAdjustments band today
Net change
+40 cm5.7 cm a day on average
Best morning
+21 cmSep 19
Worst morning
−6 cmSep 16
Rain nearby, last 7 days
2.43 inmost on Sep 14 (1.09 in)
Above the control line
4.16 mrising — observacion line ≈ 6 days up
Cidra
Sep 13 → Sep 20
400.26 → 400.54 mWatch band today
Net change
+28 cm4 cm a day on average
Best morning
+17 cmSep 17
Rain nearby, last 7 days
6.05 inmost on Sep 16 (2.19 in)
Above the ajustes line
0.31 mrising — seguridad line ≈ 25 days up
Carraízo, this week
Carraízo, morning by morning · tap a day for that chart check
Teal = up from the previous reading, coral = down; a bold border marks a move of 20 cm or more.
Three reservoirs, one scale
Change since Sep 13, in centimeters — three reservoirs on one scale. Hover or tap a point for the day's reading. Data: AAA Monitoreo Diario.
What it adds up to
Carraízo started the week at 39.14 m and ends it up 167 cm, at 40.81 m (Safe band), an average of 23.9 cm a day over 7 days. Of 7 day-to-day changes, 1 were falls and 6 rises. The sharpest fall was −2 cm on September 16. The biggest gain was +83 cm on September 17, the morning after 2.21 in of rain at the nearby gauges. It sits 1.11 m above the observación line (the next band down). Nearby USGS gauges recorded 5.19 in of rain in the final week. If the latest weekly rise held, it would climb into the Spilling band above (line at 40.95 m) in about 1 days.
La Plata started the week at 44.26 m and ends it up 40 cm, at 44.66 m (Adjustments band), an average of 5.7 cm a day over 7 days. Of 7 day-to-day changes, 2 were falls and 5 rises. The sharpest fall was −6 cm on September 16. The biggest gain was +21 cm on September 19. It sits 4.16 m above the control line (the next band down). Nearby USGS gauges recorded 2.43 in of rain in the final week. If the latest weekly rise held, it would climb into the Watch band above (line at 44.90 m) in about 6 days.
Cidra started the week at 400.26 m and ends it up 28 cm, at 400.54 m (Watch band), an average of 4 cm a day over 7 days. Of 7 day-to-day changes, 0 were falls and 5 rises, with 2 unchanged. The biggest gain was +17 cm on September 17, the morning after 2.19 in of rain at the nearby gauges. It sits 0.31 m above the ajustes line (the next band down). Nearby USGS gauges recorded 6.05 in of rain in the final week. If the latest weekly rise held, it would climb into the Safe band above (line at 401.71 m) in about 25 days.
Each reservoir against its own next band lineCarraízo since Sep 13, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.La Plata since Sep 13, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.Cidra since Sep 13, meters above sea level, shaded by AAA alert band. Data: AAA Monitoreo Diario.All 6 daily chart checks this week
Numbers from AAA’s Monitoreo Diario charts, read each morning for our reservoir board; rain from USGS gauges within 12 km of each reservoir (a proximity proxy, not a basin measurement). Rates and pace dates are arithmetic over the stored readings, not forecasts.