prEN 18049-1

SLOVENSKI STANDARD
01-marec-2024
Vodnjaki za črpanje vode - 1. del: Načrtovanje
Wells for water extraction - Part 1: Design
Brunnen zur Wassergewinnung - Teil 1: Design
Forages pour l'extraction de l'eau - Partie 1 : Conception
Ta slovenski standard je istoveten z: prEN 18049-1
ICS:
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2024
ICS
English Version
Wells for water extraction - Part 1 Design
Puits pour l'extraction de l'eau - Partie 1 : design Brunnen zur Wassergewinnung - Teil 1 Design
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 451.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18049-1:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Project objectives .15
4.1 Background .15
4.2 Requirement .15
4.3 Compliance .15
5 Site conditions .16
5.1 Background .16
5.2 Requirements .16
5.3 Compliance .16
6 Geological and hydrogeological characterization .17
6.1 Background .17
6.2 Requirements .17
6.3 Compliance .18
7 Qualitative risk assessment .19
7.1 Background .19
7.2 Requirements .19
7.3 Compliance .19
8 Estimation of yield .20
8.1 Background .20
8.2 Requirement 1.21
8.3 Compliance .21
8.4 Requirement 2.21
8.5 Compliance .21
9 Pump selection .22
9.1 Background .22
9.2 Requirement .22
9.3 Compliance .22
10 Dimensioning of the well .23
10.1 General background .23
10.2 Casing .26
10.3 Annular space .26
10.4 Formation stabilizer .27
10.5 Filter pack (gravel pack) .27
10.6 Annular seal .29
10.7 Clay plug and separation filter .30
10.8 Open area coefficient .30
10.9 Critical entrance velocity .31
10.10 Length of screen section . 32
10.11 Sump . 32
11 Selection of materials . 33
11.1 General . 33
11.2 General requirements . 33
11.3 Filter pack. 33
11.4 Casing and screen . 35
11.5 Sealing . 37
11.6 Backfilling. 38
12 Additional well equipment . 39
12.1 Background . 39
12.2 Requirement 1 . 39
12.3 Compliance . 39
13 Observation wells . 41
13.1 Background . 41
13.2 Requirement 1 . 41
13.3 Compliance . 41
13.4 Requirement 2 . 42
13.5 Compliance . 42
13.6 Requirement 3 . 43
13.7 Compliance . 43
14 Drilling methods . 43
14.1 Background . 43
14.2 Requirement 1 . 43
14.3 Compliance . 44
14.4 Compliance . 44
15 Drilling fluids . 44
15.1 Background . 44
15.2 Requirements . 44
15.3 Compliance . 45
16 Geophysical well logging . 46
16.1 Background . 46
16.2 Well logging methods . 46
16.3 Quality assurance for the performance of well logging measurements . 47
16.4 Design of logging programmes . 47
17 Development . 49
17.1 Background . 49
17.2 Requirement 1 .
...