DELICATE WATER ZONE · D0 — Abnormally dry over a member dam
San Antonio, Texas
San Antonio is an aquifer city: pumping stages key off the Edwards Aquifer's J-17 index well, and surface water is the supporting cast — Canyon Lake on the Guadalupe backstops the region, and Medina Lake's boom-bust record is the drought cycle drawn in one reservoir.
What this desk cannot see: J-17 itself: the Edwards Aquifer Authority publishes the index well daily, but no open machine-readable feed this desk can verify exists — so the number that actually triggers the city's stages is named here, not shown. SAWS' Vista Ridge pipeline and well fields are likewise ungauged in public.
The reservoirs this zone drinks from
| Reservoir | % full | Storage | Elevation | 30-day trend | Drought at the dam |
|---|---|---|---|---|---|
| Medina Lake TX | 29.5% | 75,155 af | 1,021.5 ft | 0.0 af/day | none this week |
| Canyon Lake TX | 100.0% | 378,781 af | 909.2 ft | 0.0 af/day | D0 — Abnormally dry |
af = acre-feet; a dash means the measure is not published for that reservoir. Each name links to the reservoir's full page — gauge, record, snowpack and sources.
Zone prose is curated by this desk with its sourcing inline; the numbers are the member reservoirs' own operators', on the bases named on each reservoir's page. Back to the national desk.