ISO INTERNATIONAL STANDARD 21413 First edition 2005-10-15 Manual methods for the measurement of a groundwater level in a well Méthodes manuelles pour le mesurage du niveau de I'eau souterraine dans un puits Reference number ISO 21413:2005(E) @ ISO 2005 ed by IHS und itted without license from IHS Not for Resale ISO21413:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In ?ISO2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211Geneva 20 Tel. + 4122 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland CopyightInternatinal organizationfor Standardization @ ISo 2005 - All rights reserved vithout license from IHS Not for Resale ISO 21413:2005(E) Contents Page Foreword. Introduction 1 Scope 2 Terms and definitions .. 3 Water-level measurement using a graduated steel tape 3.1 Purpose.. 3.2 Materialsandinstruments 3.3 Data accuracy and limitations .... 3.4 Advantages and disadvantages 3.5 Assumptions ... 3.6 Procedures. 4 Water-level measurement using an electric tape. 4.1 Purpose..... .6 4.2 Materials and instruments , 4.3 Data accuracy and limitations 4.4 Advantages and disadvantages .. 4.5 Assumptions ... 4.6 Procedures.. 5 Water-level measurement using an air line. 5.1 .10 5.2 Materials and instruments ..... 5.3 Data accuracy and limitations. 10 5.4 Advantages and disadvantages.. 5.5 Assumptions..... 11 5.6 Procedures..... 11 6 Water-level measurement in a flowing well..... 13 6.1 Purpose..... 13 6.2 Materials and instruments 13 6.3 Data accuracy and limitations 14 6.4 Advantages and disadvantages. 15 6.5 Assumptions ... .15 6.6 .15 6.6.1 Low-pressure head measurement (direct measurement) 15 6.6.2 High-pressure head measurement (indirect measurement) .15 7 Establishing a permanent measuring point. .16 7.1 Purpose.. 16 7.2 Materials and instruments .... 16 7.3 Dataaccuracyand limitations.. 17 7.4 Assumptions.... 17 7.5 Procedure ..... 17 Annex A (informative) Corrections for water levels measured in deep wells by steel tapes subject to temperature changes and tape stretch....... Annex B (informative) Corrections for water levels measured in wells with the air-line method... Copyright Internatinal Organizationfrstandardizallon'ghts reserved ili se from IHS Not for Resale ISO 21413:2005(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeen non-governmental, in liaison with isO, also take part in the work. iso collaborates closely with the InternationalElectrotechnicalCommission(iEC)onallmattersofelectrotechnicalstandardization International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is d