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(Use Case Vocabulary) #3 Water wells
Wells (and associated boreholes?) designed to intercept groundwater in an aquifer or aquifers. This includes bores designed to:
- extract groundwater for some use (agriculture, consumption, dewatering)
- monitor or investigate groundwater
To clarify: Does this include injection wells? -> https://github.com/opengeospatial/boreholeie/issues/20
To clarify: is a well a borehole / a role / an intersection with the surface ? -> https://github.com/opengeospatial/boreholeie/issues/xx
A borehole is the generalized term for any narrow shaft drilled in the ground. INSPIRE definition (removing ", either vertically, horizontally, or inclined." from the initial GeoSciML one).
Natural surface elevation. Elevation from a reference (datum)
In case of bores located in the same site or collocated in the same drill hole
Geologic Unit, Hydrogeo Unit, ...
Details about the method used to drill hole (auger, percussion, down hole hammer, etc).
Drilling began... drilling completed...
Current status of the well. functioning, decommissioned, collapsed, abandoned...
Decommissioned on by method of...
Purpose of well, e.g. extraction, injection, observation, dewatering, cathodic protection, decontamination, disposal, FlowingShot, Geotechnical, Mineral, MonitoringlevelHead, MonitoringQuality, Oil, OilExploratory, Seismic, WaterExploratory, etc.
Current use of the water extracted from the well : (E.g. Agricultural, Domestic, Industrial, Recreation.)
Construction components of the water well, expressed as applying to discrete section sections of the borehole. Includes casing size and material, grouting, screened interval(s), gravel pack, etc.
Details of surface construction are out-of-scope ? -> https://github.com/opengeospatial/boreholeie/issues/17
Since surface construction is out of scope, casing details need to include pipe stick-up. May be needed to convert measurements in to absolute elevations (e.g. above sea level)
Note: There is ambuiguities between sealing (grouting) the area between the casing and the borehole and completely sealing the well (permanently or temporarily abandoning it) . In the last case "plugging" may be used. Often use the same material (bentonite, cement, shale) but filling a different hole.
Procedure used to water/vermin proof the area between the casing and the borehole wall (see Annulus). Grouting prevent vertical movement of water between the aquifer and the surface, such as potentially contaminated water, gaz or organic matter that c. This is of particular importance in flood plains where large quantity of surface material can be mobilised from the flooded area.
Material used to seal the space between the casing and the borehole walls. Eg bentonite, ciment
Procedure to permanently or temporarily stop vertical movement of water inside or outside the casing.
Material used to plug the well (eg, ciment, shale, bentonite)
Type, capacity, depth of pump if present
Type, installation details, what is this probe measuring? [probe may be independent of the construction. Are probes and the data measured from them in scope? It seems to me that these are beyond the scope of describing the bore]
A description of a physical feature along the length of a borehole. May be continuous data (i.e. downhole geophysical) or discrete sections (i.e. geologist log). [Do we need separate concepts for continuous and discrete logs?]
Lithology, geological, gamma ray, resistivity ...
Driller, on-site geologist, technician, ...
Important where cores may be reinterpreted or downhole geophysics run some time after construction.
Interpretation from samples, measured from probe, ...
A measure of the volume of groundwater that can be extracted from the bore, in rate expressed as per . Includes information about the measurement of yield.
Could link to a pump test
Various types of water level are measured
- Strike Water : the water level you observed when you drill the hole
- Rest Water Level : when you come back on the field after it rests a bit.
- Pump Test : is another water level (but under human control)
A test of the constructed well to determine properties of the well and aquifer when the well is in operation. [There is a lot to cover in a pump test and a lot of variation in how it is performed and analysed. I think we need to make a decision on scope here. What is practical to include in the IE?]
Pump and recovery, step test, stress test... [Maybe a link to published document is the easiest solution here. Otherwise we need to describe observation piezos, their relation to the pumped bore, draw-down curves etc etc.]
All the water analysis done on water sampled at a well : hardness, General Chemistry, Chloride measurements, Recovery, Bacterial Analysis, Mineral Analysis...
Any administrative area or overlay that impacts, or is impacted by, the operation of this well. For example, a groundwater management area, or a monitoring program.
When was/is/will the overlay be in effect.
Who has the authority for this overlay, e.g. Dept of Water
Any licence or permnit that is attached to this borehole/well. e.g. a permit to drill and construct a bore, or a license to extract groundwater
What is this permit for
When was/is/will the permit be in effect.
Who issued this permit
Mine dewatering, irrigation, salt water interception ...