EN 14968:2006
(Main)Semantics for groundwater data interchange
Semantics for groundwater data interchange
This standard covers the semantics (meaning) of data exchanged between data producers, users and databanks, independently from the software device and the formats used to exchange the files.
It provides a consistent set of terms defining selected objects and their related attributes.
The standard is not applicable to:
data describing domestic uses (drinking water, waste water) or qualitative aspects ;
real time data or data calculated from models;
all the various characteristics on the organizations exchanging data concerned;
debimetric measures.
Semantik für den Austausch von Grundwasserdaten
Diese Norm umfasst die Semantik (Bedeutung) von Daten, die zwischen Datenerzeugern, Anwendern und Datenbanken, unabhängig von der zum Dateiaustausch verwendeten Software und den verwendeten Formaten, ausgetauscht werden.
Sie stellt eine Menge von Begriffen zur Verfügung, mit denen ausgewählte Objekte und deren zugehörige Attribute definiert werden.
Die Norm ist nicht anwendbar auf:
- Daten zur Beschreibung von Anwendungen im häuslichen Bereich (Trinkwasser, Abwasser) oder von qualitativen Aspekten;
- Echtzeitdaten oder Daten, die aus Modellen berechnet wurden;
- sämtliche verschiedenartige Merkmale von Organisationen, die die betreffenden Daten austauschen;
- Werte aus Abflussmessungen.
Sémantique pour l'échange de données concernant les eaux souterraines
La présente norme couvre la sémantique (signification) de données échangées entre les producteurs, les utilisateurs et les banques de données, indépendamment du logiciel et des formats utilisés pour échanger ces fichiers.
Elle donne une série cohérente de termes définissant des objets sélectionnés et les attributs s’y rapportant.
La présente norme ne s’applique pas :
- aux données décrivant des usages domestiques (eau potable, assainissement) ou des aspects qualitatifs ;
- aux données en temps réel ou aux données calculées à partir de modèles ;
- à toutes les diverses caractéristiques des organismes échangeant les données concernées ;
aux mesures débitmétriques.
Pomen in definicija izrazov pri izmenjavi podatkov o podtalnici
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Semantics for groundwater data interchangePomen in definicija izrazov pri izmenjavi podatkov o podtalniciSémantique pour l'échange de données concernant les eaux souterrainesSemantik für den Austausch von GrundwasserdatenTa slovenski standard je istoveten z:EN 14968:2006SIST EN 14968:2006en35.240.9913.060.10ICS:SLOVENSKI
STANDARDSIST EN 14968:200601-november-2006
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14968August 2006ICS 13.060.10; 35.240.99 English VersionSemantics for groundwater data interchangeSémantique pour l'échange de données concernant leseaux souterrainesSemantik für den Austausch von GrundwasserdatenThis European Standard was approved by CEN on 1 August 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14968:2006: E
2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 aquifer system hydrogeological entity within which all components are in hydraulic continuity and that is bound by limits representing an obstacle for the dissemination of any perceptible effect outside the system 2.2 archive data data stored to keep knowledge about an object for a given period of time 2.3 attribute characteristic of an object or entity [ISO/IEC 11179-1] 2.4 calculated data data established from calculations carried out to reach different goals: forecast, simulation, design, etc. 2.5 concept unit of thought constituted through abstraction on the basis of characteristics common to a set of objects
2.6 data representation of facts, concepts, or instructions in a formalized manner, suitable for communication, interpretation, or processing by humans or by automatic means
2.7 data element unit of data for which the definition, identification, representation, and
permissible values are specified by means of a set of attributes [ISO/IEC 11179-1]
2.9 data interchange process of sending and receiving data in such a manner that the information content or meaning assigned to the data is not altered during the transmission 2.10 data length maximum size given in a number of characters
2.11 data producer private or public entity in charge of data production and responsible for the validity of these data when they are published
2.12 data model description of the organization of data in a manner that reflects an information structure
NOTE See Annex A. 2.13 data type format used for the collection of letters, digits, and/or symbols, to depict values of a data element, determined by the operations that may be performed on the data element
2.14 definition statement that expresses the essential nature of a data element and permits its differentiation from all other data elements 2.15 entity any concrete or abstract thing of interest, including associations among things 2.16 information (in information processing): knowledge concerning objects, such as facts, events, things, processes, or ideas, including concepts, that within a certain context has a particular meaning 2.17 metadata data that defines and describes other data [ISO/IEC 11179-1] 2.18 object any part of the conceivable or perceivable world
2.19 real time data data generally taken from devices for the immediate knowledge of a phenomenon state
4123 Key 1 height (-) 2 level zero 3 depth to groundwater level (+) 4 measurement point Figure 1 — Qualification of the groundwater level measurements 4.1.2 Type of time series 4.1.2.1 General The groundwater level is measured with discontinuous or continuous time series.
21 Example A Example B Example C Key 1 time 2 depth to groundwater level Figure 3 — Elevation of the groundwater level between measurements
Figure 4 — Continuous time series presentation 4.1.4 Validation of the measurements The validity of each measurement is described according to the type of measurement method used. Four scenarios are possible: a) Impossible to validate;
Suspect ;
d) Not valid ; By default, all values are specified as ‘Not validated yet’. The operator shall then assign one of the above- mentioned qualifications after examination. A measurement is validated when the producer believes that the data and all the different procedures used to produce them comply with the monitoring protocol. A measurement is not valid when the producer believes that the data or the procedures used to produce them do not comply with the measurement protocol. A measurement is "Impossible to validate" when the operator does not have the information available to determine the validity of the data production according to the measurement protocol ( e.g. historical data from archives). 4.2 Piezometer station 4.2.1 General A piezometer is one method of measuring the piezometric height at a point within an aquifer system. It indicates the pressure at this point, enabling the observer to record the phreatic level or pressure. In the data interchange, only the depths to groundwater level of a piezometer are exchanged.
According to the scope of this standard, the concept of "piezometer" is extended to all artificial structures (well, borehole, gravel-pit) or natural structures (swallow, hole, grottos) which enables the groundwater level to be measured. Each piezometer shall have a unique code given by the country where it is located. 4.2.2 Key features of a piezometer 4.2.2.1 General Each piezometer has two key features: the level measurement point and the altitude benchmark measurement point as shown in Figure 5.
Key 1 plinth 2 level measurement point 3 altitude of surface in relation to the national altitude reference system 4 depth to groundwater level 5 groundwater level 6 altitude benchmark point
Figure 5 —
Key features of a piezometer 4.2.2.2 Level measurement point The level measurement point is the location on the piezometer used as a marker to measure the depth of the groundwater level (for example: the side of the tube of the borehole, the edge of the well, the reference ground level on a gravel-pit, etc.). The level measurement point is 0, which is the basis for all depth measures. It applies to all measurement points. The real height is defined by using benchmark points. 4.2.2.3 Altitude benchmarks Altitude benchmark points are used to compare data from all the piezometers in an aquifer system in order to determine the groundwater level of the system.
Three main locations are generally used to establish an altitude benchmark point: the level measurement point itself (when it is a permanent fixture), the altitude of the surface level or the plinth altitude.
12354 Key 1 casing 2 unconfined aquifer 3 confined aquifer 4 impermeable layer 5 screens
Figure 7 — A borehole linked to two aquifers The lithology at the piezometer location should also be described, so that information on local variations in the general lithology defined for the whole aquifer can also be provided. 4.2.4 Piezometer history Many events can happen during the lifetime of the piezometer. This kind of information shall be stored with the date since it can be very useful to understand the time series described. These events might be: a new topographic survey; the building of a new collar/plinth; a new measuring equipment; the destruction of the piezometer head by works; etc. 4.3 Groundwater level producer At a given date, a piezometer is always the responsibility of a producer. The producer might change during the life cycle of the piezometer because the responsibility can move from one producer to another. It is therefore important to keep track of such changes.
Describe the organization involved in the interchanges: who is sending what to whom, when, and
by what means ? Prepare a formal document such as a contract agreed by the partners involved in the interchanges and containing all these aspects and any additional relevant elements that may prove necessary. 6 Object dictionary 6.1 General This directory contains a list of basic objects used in the field of groundwater.
Data to be exchanged about the list of hydrogeological entities shall be defined by the partners involved in the interchange. This object includes the following information: Aquifer system code (object identifier);
Aquifer system name;
Aquifer system state; Aquifer system nature; General information on the aquifer system; Comments on the aquifer system. 6.3 Measurement method used with the piezometer The measurement method used with a piezometer represents the history of the various methods which have been used with the frequency of the measurements carried out with the piezometer.
Information on the piezometer is the responsibility of the organization(s) providing the data and that uses the piezometer. This object includes the following information: Starting date of use of the measurement method (object identifier); Closing date of use of the measurement method; Measurement method;
Measurement frequency;
Comments on the measurement method used on the piezometer.
6.5 Organization Organizations are private or public entities identified for the functions that they play (data producer, operator, etc.) in data exchanges. The list of organizations shall be defined by the partners involved in the data interchange. This object includes the following information: Organization code (object identifier);
Organization name; Organization address 1; Organization address 2; Organization address 3; Organization address 4; Organization address 5; Organization address 6; Comments on the organization. 6.6 Operating period of a piezometer by an organization A piezometer is usually operated by a single organization, known as the manager of the piezometer. However, a piezometer may be managed by two or more organizations. In this latter case, only one organization is responsible for validating data produced.
The piezometer manager(s) can change in the course of time. The period during which an organization has been responsible for the piezometer shall also be specified.
The establishment of the management periods of the piezometer is placed under the responsibility of the organization(s) providing the data and that uses the piezometer.
Starting date of the operating period of the piezometer (object identifier);
Closing date of the operating period of the piezometer;
Operator's internal code of the piezometer. 6.7 Period of association of a piezometer to a network Typically, a piezometer is operated within one monitoring network during a given period of time. In some cases, a piezometer may belong to several networks during the same period of time. This information is the responsibility of the organization(s) providing the data and that uses the piezometer. This object includes the following information: Starting date of the association period of a piezometer to a monitoring network (object identifier); Closing date of the association period of a piezometer to a monitoring network; Operator's internal code of the piezometer. 6.8 Piezometer
Basically, a piezometer is a device to measure the piezometric height at a given point within an aquifer system. It indicates the pressure at this point, enabling the phreatic level or pressure to be observed and recorded. [Source: G. Castany, J. Margat (1977) French dictionary of hydrogeology, Editions du BRGM, Orléans, France]. However, for practical reasons, and in keeping with common practice, in this standard the piezometer concept is extended to all artificial structures (well, borehole, gravel-pit etc.) or natural structures (spring, swallow hole, grottoes etc.) which permit access to the groundwater to measure it. Theoretically, a piezometer is a device used to measure only one groundwater level. As a matter of fact, a piezometer can be used to measure several groundwater levels if it is linked to several layers separately.
Information on the piezometer is the responsibility of the organization(s) providing the data and that uses the piezometer. This object includes the following information: Piezometer code (object identifier); Piezometer name;
Name of the piezometer location; Type of piezometer; Creation date of piezometer; Closing date of piezometer; Coordinate X of piezometer; Coordinate Y of piezometer;
altitude; Expression of the piezometer time series;
Confinement condition; Name of the town; Piezometer lithology name; Piezometer lithology type name; Comments on the piezometer. 6.9 Piezometer altitude benchmark point The altitude benchmark point of the piezometer is a physical point located on the piezometer. Its altitude is measured (more or less precisely) to establish the elevation (z level) of the groundwater piezometric height. For a conventionally built piezometer (a tube rising above the ground level protected by a base or a plinth), three positions can be used as a piezometer altitude benchmark point: The measurement reference mark (tube rim); The upper rim of the base or plinth;
The ground at the foot of the piezometer.
The altitude of these points can be obtained using two methods: either from the measurement carried out by a land surveyor or, directly from a map scaled at 1:25 000 or over (if it is the only source of information available).
The altitude of the altitude benchmark point may be expressed using different reference systems. Several altitude benchmark points of different types (mark, rim or ground) may be used for the piezometer at any given time. Information on the piezometer is placed under the responsibility of the organization(s) collecting data and processing them. This object includes the following information: Type of the altitude benchmark point of the piezometer (object identifier); Starting date of the validity of the altitude benchmark point (object identifier); Closing date of the validity of the altitude benchmark point;
Altitude of the altitude benchmark point of the piezometer; Altitude reference system; Method for the altitude measurement;
6.10 Piezometer event Events may occur on a piezometer. They include facts that the data producer using the piezometer may wish to record as they are considered as being significant to understand the lifecycle of a piezometer and interpret the data that are measured by the piezometer. EXAMPLES: Rebuilding plinths; Redefining the altitude benchmark point; Installing a measurement device.
Information on the piezometer is the responsibility of the organization(s) producing data and processing them. This object includes the following information: Date of the piezometer event (object identifier); Description of the piezometer event.
6.11 Level measurement point The level measurement point is the physical point located on the piezometer housing, from which the groundwater level is measured. The difference of level between the level measurement point and the altitude benchmark point shall be known so that the surface altitude of the aquifer system may be determined. With a conventionally built piezometer (with a tube rising above ground level, and protected by a base or a plinth), the height is negative when the altitude benchmark point corresponds to the ground at the foot of the piezometer or the upper rim of the base or plinth. It is equal to zero if the altitude benchmark point corresponds to the measurement point. The description of the marker indicates to which altitude benchmark point the mark refers. The information on the piezometer is the responsibility of the organization(s) acquiring data acquisition or managing them. This object includes the following information: Starting date of the validity of the level measurement point (object identifier); Closing date of the validity of the level measurement point;
Distance between the level measurement point and the altitude benchmark point; Altitude benchmark point taken as reference; Comments on the level measurement point;
6.12 Piezometric time series The piezometric time series is measured as a function of time and water levels observed at a given piezometer in an aquifer system.
Variations of heights are discretized to obtain a depth/time representation in the shape of a series of poly-lines.
Each depth is validated by one and only one of the organizations designated as the operator of the piezometer.
This information is placed under the responsibility of the organization(s) collecting data and the measurements on the piezometer.
This object includes the following information: Date of the point (object identifier); Time of the point (object identifier); Point value; Continuity code of the point; Mode to obtain the point; Point precision; Point validity.
7 Attribute dictionary 7.1 General This directory names and defines a list of attributes specifying the objects that are listed in Clause 6. Each attribute is given: a) A name which appears as the title of the article; b) The object related name; c) A definition; d) Specifications including: Data type and its length; The data producer who is the organization(s) responsible for the attribute described and likely be transmitted; A list of values, if relevant; A written rule for clarification when necessary. 7.2 Altitude benchmark point taken as reference Definition: point used to measure the difference of the elevation level of the piezometer from the measurement point. It is described using one of the codes in Table 1.
Data type: Character string Length: 1 Data producer: Organization producing data and operating the piezometer 7.3 Altitude of the altitude benchmark point Definition: elevation of the measurement point of a piezometer, expressed in metres, according to the altitude reference system. Object related name: ALTITUDE BENCHMARK POINT Specifications:
Data type: Number Data producer: Organization producing data and operating the piezometer 7.4 Altitude reference system Definition: name of the altitude reference system in which the altitude of the altitude benchmark point of the piezometer is expressed. Object related name: PIEZOMETER ALTITUDE BENCHMARK POINT Specifications:
Data type: Character string Length: 100 Data producer: Organization(s) producing data and operating the piezometer 7.5 Aquifer system code Definition: identifier assigned to each aquifer system It is recommended that this code be stable and unique in the course of time at a high geographical level: region, state or continent like Europe. The same code shall be used all the time to specify geographical level, such as area, region, state or continent e.g. Europe.
Object related name: AQUIFER SYSTEM Specifications:
Data type: Character string Length: 8 Data producer: Partners exchanging data Value(s): Codes Additional specifications: Identifier
Costal aquifer of Mar del Plata (Argentina)
Karasu karstic aquifer (Turkey)
The names of subdivisions of hydrogeological entities are composed of: a) The name of the main aquifer system, separated from the name of the subdivision by a division slash ‘/’; b) Or the name of the main aquifer system complemented by the code for the subdivision. Examples of names: ILE CREMIEU / PLAINE D’OPTEVOZ (France)
Object related name: AQUIFER SYSTEM Specifications:
Data type: Character string Length: 80 Data producer: Organization producing data and operating the piezometer 7.7 Aquifer system nature Definition: indication specifying whether it refers to an aquifer system or a hydrogeological domain. This is expressed by using one of the codes in Table 2: Table 2 — List of values allocated to aquifer system nature
Code Label 1 Aquifer system 2 Hydrogeological domain A hydrogeological domain is a reference space area which are little aquifers (in comparison with an aquifer system). It is possible some aquifer entities but without a large extension and isolated in a impermeable entity.
The expression “Aquifer system” refers to an entity, all its parts being hydraulically connected and which is confined within limits preventing any noteworthy influence from spreading outside it.
Object related name: AQUIFER SYSTEM Specifications:
Data type: Character string Length: 1 Data producer: Organization producing data and operating the piezometer Value(s): Codes 7.8 Aquifer system state Definition: confinement condition of an aquifer system. It is described using the codes in Table 3.
Table 3 — List of values allocated to aquifer system state Code Label Definition 1 Confined aquifer system
An aquifer system is said to be confined when it is trapped between two totally impermeable layers of rock. 2 Unconfined aquifer system (or free) An aquifer system is said to be unconfined when it is not covered with an impermeable layer. 3 Confined and unconfined aquifer An aquifer system is said to be confined and unconfined when it is either globally one or the other, but includes unconfined or confined area, covering one or more places of its surface area. 4 Partly confined aquifer system An aquifer system is said to be partly confined when it is overlain by a semi-permeable layer (e.g.: Saône aquifer system, which was originally unconfined but which has, with time, gradually become overlain by loam). 5 Artesian
6 Partly artesian
Object related name: AQUIFER SYSTEM Specifications:
Data type: Character string Length: 1 Data producer: Organization producing data and operating the piezometer Value(s): Codes 7.9 Closing date of the operating period of the piezometer Definition: date, expressed to the nearest day, when the organization currently operating (or co-operating) the piezometer finishes filling its function. Object related name : OPERATING PERIOD OF A PIEZOMETER BY AN ORGANIZATION Specifications:
Data type: Date Length: Length of the date in figures and words Data producer: Organization producing data and operating the piezometer Additional specifications: Identifier
Data type: Date Length: Length of the date in figures and words Data producer: Organization producing data and operating the piezometer 7.11 Closing date of the association of a piezometer to a monitoring network Definition: date, expressed to the nearest day, when the piezometer does no longer belong to the monitoring network Object related name: PERIOD OF ASSOCIATION OF A PIEZOMETER TO A NETWORK Specifications:
Data type: Date Length: Length of the date in figures and words Data producer: Organization producing data and operating the piezometer Additional specifications: Identifier 7.12 Closing date of piezometer Definition: date, expressed to the nearest day, when the piezometer is definitely shut down, i.e. the date when measurements can no longer be observed with this piezometer (the piezometer is damaged or destroyed, etc.) The date of closure shall not be confused with the date when data are no more obtained by using the piezometer. As a matter of fact, a piezometer can be temporarily abandoned, and then put again into service after a given (more or less long) period. Object related name: PIEZOMETER Specifications:
Data type: Date Data producer: Organization producing data and operating the piezometer
7.13 Closing date of the validity of the altitude benchmark point Definition: date, expressed to the nearest day, when the altitude benchmark point can no longer be used to determine the piezometric height of the aquifer system. Object related name: PIEZOMETER ALTITUDE BENCHMARK POINT Specifications:
Data type: Date Data producer: Organization producing data and operating the piezometer
Data type: Date Data producer: Organization producing data and operating the piezometer 7.15 Code of the monitoring network Definition: unique code that identifies a unique monitoring network of a given geographic scale within an interchange The same code shall be used all the time to specify geographical level, such as area, region or state, continent e.g. Europe. Object related name: MONITORING NETWORK Specifications:
Data type: Character string Length: 10 Data producer: Partners exchanging data Additional specifications: Identifier 7.16 Comments on the aquifer system Definition: relevant additional information that cannot be recorded against its formalised specifications Object related name: AQUIFER SYSTEM Specifications:
Data type: Character string Length: Unlimited Data producer: Partners exchanging data 7.17 Comments on the measurement method used on the piezometer Definition: relevant additional information that cannot be recorded against its formalised specifications Object related name: MEASUREMENT METHOD USED WITH THE PIEZOMETER Specifications:
Data type: Character string Length: Unlimited Data producer: Organization producing data and operating the piezometer
Data type: Character string Length: Unlimited Data producer: Organization producing data and operating the piezometer The list of organizations shall be specified by the partners exchanging data. 7.19 Comments on the piezometer Definition: relevant additional general information about the piezometer differing from information of “event” type or that recorded for the piezometer attributes Object related name: PIEZOMETER Specifications:
Data type: Character string Length: Unlimited Data producer: Organization producing data and operating the piezometer 7.20 Comments on the altitude benchmark point Definition: relevant additional information that cannot be recorded against the formalised specifications provided Object related name: ALTITUDE BENCHMARK POINT Specifications:
Data type: Character string Length: Unlimited Data producer: Organization producing data and operating the piezometer 7.21 Comments on the level measurement point Definition: relevant additional information that cannot be recorded against the formalised specifications provided Object related name: LEVEL MEASUREMENT POINT Specifications:
Data type: Character string Length: Unlimited Data producer: Organization producing data and managing the piezometer 7.22 Coordinate reference system of the piezometer Definition: identify coordinates such that those coordinates describe position unambiguously. An example of Coordinate reference system is proposed by the EPSG group: http://www.epsg.org/.
Object related name: PIEZOMETER Specifications:
Data type: Character string Length: Unlimited Data producer: Organization producing data and managing the piezometer
7.23 Confinement condition Definition: description of any local variations of the water confinement within the aquifer system. It is defined by using one of the following codes given in Table 4. Table 4 — List of values allocated to confinement condition Code Label 0 Type of aquifer system unknown 1 Unconfined 2 Confined 3 Unconfined and confined or semi-confined 4 Artesian Specifications:
Object related name: PIEZOMETER Data type: Character string Length: 1 Data producer: Organization producing data and operating the piezometer Value(s): Codes 7.24 Continuity code of the point Definition: time/depth time series curves are represented with points. By default, each point is linked to the previous point. However, a time series can sometimes be interrupted for various reasons and consequently the point marking the beginning of a time series is not related to the previous point. Object related name: PIEZOMETRIC TIME SERIES Specifications:
Data type: Character string Length: 1 Data producer: Organization producing data and operating the piezometer
Value(s): Codes
The point continuity code is used to manage the continuity between all the points. The default value is 2. It indicates that the point is a common point, i.e. it is related to the previous point. When the code designates the first point, i.e. a point starting a time series, its value is 1. A time series terminates with a common point.
7.25 Coordinate X of the piezometer Definition: the coordinate X in the projection given under the attribute “Coordinate Reference system of the piezometer”. Conventionally, the projection is the European one: the European Terrestrial Reference System 1989 (ETRS89). Coordinates shall be determined on a map with a scale greater or equal to 1:50 000. Object related name: PIEZOMETER Specifications:
Data type: Number Data producer: Organization producing data and operating the piezometer 7.26 Coordinate Y of the piezometer Definition: the coordinate Y in the projection given under the attribute “Coordinate Reference system of the piezometer”. Conventionally, the projection is the European one: the European Terrestrial Reference System 1989 (ETRS89) Coordinates shall be determined on a map with a scale greater or equal to 1:50 000. Object related name: PIEZOMETER Specifications:
Data type: Number Data producer: Organization producing data and operating the piezometer 7.27 Creation date of piezometer
Definition: date, (expressed to the nearest day) when the piezometer was created and installed. The creation date does not necessarily coincide with the date when measurements started. Object related name: PIEZOMETER Specifications:
Data type: Date Data producer: Organization(s) producing data and operating the piezometer 7.28 Date of the piezometer event Definition: date, expressed to the nearest day, at which the event about the piezometer occurred Object related name: PIEZOMETER EVENT Specifications:
Data type: Date Data producer: Organization producing data and operating the piezometer Additional specifications: Identifier
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