How the labels overlap
A tube well and a borehole can describe the same completed water source. They are not three mutually exclusive equipment choices. Compare the construction record before deciding what a local name means.
| Label | Common meaning | What to verify |
|---|---|---|
| Well | A broad groundwater-access term; construction may be dug, driven, bored or drilled. | Construction method, completed dimensions and intended water-supply use. |
| Borehole | A drilled opening, which may serve water supply, monitoring or investigation. | Purpose and completion; a drilled hole is not automatically a usable production well. |
| Tube well / tubewell | A tubular pipe/casing description whose usage varies. It can overlap with a drilled water well. | Whether the record means driven/jetted pipe or a drilled, cased well; screen or open interval. |
Separate the name from construction
Some manuals use tube well specifically for a driven or jetted pipe; other groundwater records use tubular-well terminology alongside drilled wells. Keep the local name, but add the actual method. There is no single worldwide depth or diameter that separates all wells, boreholes and tube wells. Neither a deeper-sounding name nor the word borehole establishes water quality or a dependable supply.
Read casing, screen and open interval
Casing supports and isolates parts of the opening. A screen admits water while limiting entry of formation material; suitable consolidated rock may instead have an open-hole interval. Record actual casing internal diameter, material, screened/open depths and completion details. Do not infer these from the quoted bore diameter or choose a pump solely because its label says borehole pump. Construction and pump clearance require the current record, manufacturer data and qualified review.
Keep static and pumping water levels distinct
Static water level is the nonpumping level after a stated recovery period. Pumping water level is observed while discharging at a recorded rate and elapsed time. State whether each number is depth below a measuring point or elevation above a datum; convert to the same reference before subtracting. Record date, units and recent pumping. A level without its operating condition is not a reliable pump-planning input.
Distinguish total depth, drawdown and pump setting
Total well depth describes the bottom of the opening, not the water lift. With both levels expressed as depth below the same datum, drawdown equals pumping depth minus static depth. Entered pump submergence equals intake setting depth minus pumping water depth. These differences describe one observed condition; they do not establish sufficient submergence or seasonal adequacy. Do not substitute total depth or pump setting for pumping water level in a lift calculation.
Interpret yield with the test record
Yield is a discharge rate under stated conditions. Specific capacity is discharge divided by drawdown, with both units and elapsed test time retained. A brief rate, the stored water inside the well or the bore diameter alone does not establish a year-round sustainable yield. Use the Well Yield vs Demand Checker only with a defensible source rate and demand assumptions; the name of the well supplies neither.
Request a useful handover record
Ask for the local name and purpose, location, dated construction log, datum/measuring point, units, total depth, casing and screen/open interval, pump intake setting, test flow and duration, levels over time and recovery. Retain water-quality results separately. Compare documents against one source and date before using the Well & Borehole Pump Sizing Planner. Missing values remain unknown; a regional term must not silently fill them in.
Worked example
An illustrative record states total depth 45 m, static water depth 12 m, pumping water depth 26 m at 20 L/min after 60 minutes, and pump intake setting 35 m, all below the same ground datum. Drawdown is 26 − 12 = 14 m; entered submergence is 35 − 26 = 9 m. If the outlet is 5 m above that datum, lift from the pumping surface is 26 + 5 = 31 m before delivery pressure and losses. Enter pumping level 26 m and setting 35 m separately in the pump planner, not 45 m as lift. The 60-minute interval is an example, not a test protocol; 9 m is not a minimum requirement and 20 L/min is not proof of sustainable yield.
Sources
- U.S. Geological Survey — Water Resources Glossary
- U.S. Geological Survey — Basic Ground-Water Hydrology
- U.S. Geological Survey — Groundwater Wells
- British Geological Survey — Borehole Records
- FAO — Rural Water Supply: Wells
- FAO — Groundwater Resources Development