Hydrohistorian
HAMMANN WELL
Monitored well · 157475 · Division 2 · Water District 10
Its well permit here · Well permit at DWR ↗
Source DWR administrative record · verify at DWR well record ↗ Source DWR administrative record · verify at DWR permit record ↗
Unclassified
No aquifer or designated-basin assignment — administrative world unknown, kept out of recharge math.
Water-level record
No water-level measurements are cached for this well. It is in the well inventory — permit, construction and aquifer below — but nobody has logged a level we hold.
Geophysical log
DWR holds a geophysical log for this well (DWR's code: <NA>). DWR's log page.
Curves digitized from the scan
Hydrohistorian traced the scanned log automatically. 1 curve passed the confidence gate; 14 did not and are listed with the reason. Screening data: the scan stays the record.
| Curve | Interval ft | Coverage | Verdict | Curves like this one scored | |
|---|---|---|---|---|---|
| OHM (OHM) | 6–169 | 100% | not used: ambiguous rows 36%; curve name not recognized: 'OHM' | ||
| OHMM (OHMM) | 6–169 | 14% | not used: coverage 15%; ambiguous rows 26%; curve name not recognized: 'OHMM' | ||
| mV (mV) | 6–169 | 4% | not used: coverage 5%; ambiguous rows 19%; curve name not recognized: 'mV' | ||
| OHM (OHM) | 180–389 | 100% | not used: ambiguous rows 25%; curve name not recognized: 'OHM' | ||
| OHMM (OHMM) | 180–389 | 10% | not used: coverage 10%; ambiguous rows 39%; curve name not recognized: 'OHMM' | ||
| mV (mV) | 180–389 | 5% | not used: coverage 5%; ambiguous rows 84%; curve name not recognized: 'mV' | ||
| OHM (OHM) | 400–609 | 100% | not used: ambiguous rows 32%; curve name not recognized: 'OHM' | ||
| OHMM (OHMM) | 400–609 | 10% | not used: coverage 10%; ambiguous rows 55%; curve name not recognized: 'OHMM' | ||
| mV (mV) | 400–609 | 6% | not used: coverage 7%; ambiguous rows 62%; curve name not recognized: 'mV' | ||
| OHM (OHM) | 620–788 | 93% | not used: ambiguous rows 30%; curve name not recognized: 'OHM' | ||
| OHMM (OHMM) | 620–788 | 18% | not used: coverage 19%; ambiguous rows 63%; curve name not recognized: 'OHMM' | ||
| mV (mV) | 620–788 | 12% | not used: coverage 13%; ambiguous rows 73%; curve name not recognized: 'mV' | ||
| Natural Gamma (CPS) | 6–788 | 66% | pass | r 0.99 median, error 3.3% of scale, 3% below r 0.8 (n 89) | LAS |
| Single-Point Resistance (OHM) | 6–788 | 5% | not used: coverage 5%; ambiguous rows 31%; curve class not verified by the benchmark: Single-Point Resistance traced as thick | ||
| Spontaneous Potential (mV) | 6–788 | 97% | not used: ambiguous rows 13%; SP: the printed scale is a span with an unknown offset, and the benchmark could not verify the shape (median r 0.28 after offset removal) |
"Curves like this one" is the benchmark row for this curve's class: curves of the same name traced the same way, scored against DWR's own digital log of the same run. r is correlation (the print's own smoothing allowed for); error is mean absolute error as a share of the track's printed range; "below r 0.8" is the share of passing curves in the class that still disagreed with DWR's log, which this curve's own numbers cannot rule out.
The LAS files and every verdict are in the statewide groundwater release
(/data, table gw_digitized); the MCP server's gw_digitized_curves and
gw_net_sand work from them. How well the tracer does was
measured against DWR's own digital logs.
The well itself
| Ground elevation | 6423.24 ft |
|---|---|
| Permit | 88480 |
| Location | 38.90000, -104.50000 |
What this page is not
Monitoring records are irregular: measurements cluster where somebody chose to look, so a trend describes this well's record, not the aquifer as a whole. Levels are DWR's published measurements, unedited. A trend here is not a prediction, and it is not a determination about anyone's water right.