Groundwater Level Logger
Track depth-to-water across wells and piezometers — seasonal trends, drawdown patterns and CSV export for aquifer studies; offline + GPS.
Well / piezometers
Log a water-level measurement
Field guide: Groundwater Level Logger
A single water-level reading is trivia; a sequence is a hydrograph — and hydrographs are how falling water tables, failing recharge and over-pumped aquifers announce themselves years before wells go dry. This logger does the unglamorous core of groundwater monitoring: depth-to-water from a fixed, marked measuring point per well, dated, GPS-sited, trended. The pre/post-monsoon pair alone (the CGWB national rhythm) tells you whether the aquifer recovered this year; monthly readings show pumping seasons breathing.
The two optional companions earn their place: a temperature jump can flag mixing from a different aquifer zone, and electrical conductivity creeping upward is the classic early signature of salinity ingress (coastal aquifers) or return-flow contamination — flagged here above 3000 µS/cm as a screening level. The measuring-point discipline is everything: levels are read against the same marked notch forever, or the record means nothing.
Field tips
- Mark the measuring point physically (paint/notch on the casing top) and never change it — MP drift is the silent killer of level records.
- Measure before the day's pumping starts (static level), or log 'pumping' in the note — mixing static and dynamic levels fakes trends.
- Twice is the minimum, monthly is the goal: the pre/post-monsoon delta is your recharge number; monthly catches the shape between.
Records are stored only in this browser (localStorage) — export regularly. This tool aids field documentation; it does not replace your agency's official inspection procedures or engineering judgment.
Groundwater Level Logger — Track depth-to-water across wells and piezometers — seasonal trends, drawdown patterns and CSV export for aquifer studies; offline + GPS. Free, offline-first and GPS-aware: open it on any phone, log in seconds, and hand your GIS team clean GeoJSON.
About Groundwater Level Logger
A single water-level reading is trivia; a sequence is a hydrograph — and hydrographs are how falling water tables, failing recharge and over-pumped aquifers announce themselves years before wells go dry. This logger does the unglamorous core of groundwater monitoring: depth-to-water from a fixed, marked measuring point per well, dated, GPS-sited, trended. The pre/post-monsoon pair alone (the CGWB national rhythm) tells you whether the aquifer recovered this year; monthly readings show pumping seasons breathing.
How to use Groundwater Level Logger
- 1Set up each monitoring site once with its location and GPS pin.
- 2Enter readings as you take them — limits for this medium are pre-configured from the cited standard.
- 3Exceedances are flagged instantly and the compliance rate updates as you log.
- 4Export the period's readings and exceedance report for your compliance file.
Why use Groundwater Level Logger?
- ✓100% free, no sign-up — built for crews, not per-seat licences
- ✓Offline-first: records save to your device instantly and survive dead zones
- ✓One-tap GPS tagging with accuracy capture on every record
- ✓Exports CSV for asset systems, GeoJSON for GIS, and print-ready reports
- ✓Checklist and guidance aligned with CGWB
Frequently asked questions
How do I actually measure depth to water?+
The standard tools: an electric water-level tape (beeps at contact) lowered from the marked measuring point, or the wetted-tape method for shallow wells. Read to the centimeter, record immediately. Sonic meters work where tape access is blocked. Whatever the tool, the same MP and the same technique every visit is what makes readings comparable.
What does the pre/post-monsoon difference tell me?+
It's the annual recharge signal: post-monsoon levels should rise relative to pre-monsoon as rains percolate in. A shrinking rise year-over-year — or post-monsoon levels that no longer recover to last year's — is aquifer depletion in progress, the exact pattern CGWB classifies blocks as semi-critical/critical/over-exploited from.
Why track EC alongside levels?+
Because falling levels and rising salinity travel together in two big failure modes: coastal over-pumping pulls seawater landward, and declining inland tables concentrate salts. EC is a 10-second probe reading; its trend at your wells is an early-warning chemical sentinel that pure level data can't provide.
What's the difference between a well reading and a piezometer?+
A production well's level reflects pumping (its own and neighbors') — useful but noisy. A piezometer is a non-pumped observation point open to one aquifer zone, giving the clean signal. Mixed networks are normal; just label which is which per site so drawdown noise doesn't masquerade as regional decline.
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