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ISO 22282-4-2012

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ISO 22282-4-2012

ISO 2012Geotechnical investigation and testing Geohydraulic testing Part 4 Pumping testsReconnaissance et essais gotechniques Essais gohydrauliques Partie 4 Essais de pompageINTERNATIONAL STANDARDISO22282-4First edition2012-06-01Reference numberISO 22282-42012ECopyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.ISO 22282-42012Eii ISO 2012 – All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All 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 officeCase postale 56 CH-1211 Geneva 20Tel. 41 22 749 01 11Fax 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandCopyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.ISO 22282-42012E ISO 2012 – All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Terms, definitions and symbols 23.1 Terms and definitions . 23.2 Symbols . 24 Equipment . 25 Test procedure . 35.1 Test preparation . 35.2 Arranging the disposal of discharge water 35.3 Executing and equipping the well . 45.4 Executing and equipping the piezometers . 65.5 Execution of the test . 65.6 Uncertainty of measurement 95.7 Interruptions in pumping . 95.8 Decommissioning . 96 Test results 97 Reports .107.1 Field report 107.2 Test report . 11Annex A informative Record of measured values and test results of the pumping test Example . 12Annex B informative Determining the pumping test discharge 14Annex C informative Interpretation of the pumping test results .18Bibliography .25Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.ISO 22282-42012EForewordISO the International Organization for Standardization is a worldwide federation of national standards bodies ISO member bodies. The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission IEC on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC 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 drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 22282-4 was prepared by the European Committee for Standardization CEN Technical Committee CEN/TC 341, Geotechnical investigation and testing, in collaboration with Technical Committee ISO/TC 182, Geotechnics, Subcommittee SC 1, Geotechnical investigation and testing, in accordance with the Agreement on technical cooperation between ISO and CEN Vienna Agreement.ISO 22282 consists of the following parts, under the general title Geotechnical investigation and testing Geohydraulic testing Part 1 General rules Part 2 Water permeability tests in a borehole using open systems Part 3 Water pressure tests in rock Part 4 Pumping tests Part 5 Infiltrometer tests Part 6 Water permeability tests in a borehole using closed systemsiv ISO 2012 – All rights reservedCopyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.INTERNATIONAL STANDARD ISO 22282-42012EGeotechnical investigation and testing Geohydraulic testing Part 4 Pumping tests1 ScopeThis part of ISO 22282 establishes requirements for pumping tests as part of geotechnical investigation service in accordance with EN 1997-1 and EN 1997-2.A pumping test consists in principle of drawing down the piezometric surface of the groundwater by pumping from a well the test well; measuring the pumped discharge and the water level in the test well and piezometers, before, during and after pumping, as a function of time.This part of ISO 22282 applies to pumping tests performed on aquifers whose permeability is such that pumping from a well can create a lowering of the piezometric head within hours or days depending on the ground conditions and the purpose. It covers pumping tests carried out in soils and rock.The tests concerned by this part of ISO 22282 are those intended for evaluating the hydrodynamic parameters of an aquifer and well parameters, such as permeability of the aquifer, radius of influence of pumping, pumping rate of a well, response of drawdown in an aquifer during pumping, skin effect, well storage, response of recovery in an aquifer after pumping.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments appliesISO 14688-1, Geotechnical investigation and testing Identification and classification of soil Part 1 Identification and descriptionISO 14689-1, Geotechnical investigation and testing Identification and classification of rock Part 1 Identification and descriptionISO 22282-1, Geotechnical investigation and testing Geohydraulic testing General rulesISO 22475-1, Geotechnical investigation and testing Sampling methods and groundwater measurements Part 1 Technical principles for execution ISO 2012 – All rights reserved 1Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.ISO 22282-42012E3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 22282-1 and the following apply.3.1.1radius of influence of pumpingRtdistance, measured from the axis of the well, beyond which the lowering of the piezometric surface of the groundwater is nilNOTE In a steady-state condition, Rt is constant, and is thus designated by Ra.3.2 SymbolsSymbol Designation UnitD drilled diameter of the well md thickness of the aquifer mL wetted length of screen of the perforated pipe placed in the well mQ flow rate m3/sQddischarge rate, assessed pumping discharge at the end of the well preparation m3/sQedischarge of the pumping test m3/sRaradius of influence under steady-state conditions mRt radius of influence at time t mS storage factor T transmissivity m2/st time sv velocity a slope of the line that characterizes the drawdown in the well b ordinate at the origin of the line that characterizes the drawdown in the well c conventional drawdown unit of the preliminary pump discharge dNsize which may be interpolated from the grading curve, of the square sieve mesh of side d for which the weight percent of undersize is equal to N percente distance between the bottom of the well and the surface of the unconfined groundwater at rest in an aquifermkhhorizontal permeability coefficient m/sDh drawdown of the water level in the well mDh’ drawdown of the water level in the well after 2 h mDhfdrawdown of the water level in the well, set during the preliminary test and not to be exceededmDhmaxmaximum drawdown of the water level in the well during the pumping test m4 EquipmentConducting a pumping test requires the following equipment and instrumentsa a test well and piezometers see ISO 22475-1;2 ISO 2012 – All rights reservedCopyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.ISO 22282-42012Eb a pump and associated pipework capable of pumping from the test well. The pumps shall be equipped with a suitably long discharge pipe so that the water from the pump is discharged sufficiently far away so that it does not affect the test area. The capacity of the pump shall be sufficient to extract from the well a discharge at least equal to that corresponding to that estimated to achieve the maximum planned drawdown;NOTE Pumping tests are commonly carried out using electric submersible pumps, installed within the test well. However, depending on conditions, pumping tests can also be carried out using suction pumps located at the surface, airlift equipment, or special dewatering equipment such as wellpoints or eductors.c a system for regulating and measuring the discharge m3/s. Devices for measuring the discharge rate shall be suitably calibrated and shall be accurate for a range of flow rates anticipated during the test;d a system for measuring the water level in the test well and piezometers. The turbulence in the test well caused by pumping shall be considered; the devices shall be capable of measuring water levels over the range of drawdowns anticipated during the test;e a time measuring and/or recording device, reading in seconds.5 Test procedure5.1 Test preparation5.1.1 GeneralWhen preparing a pumping test, there are a number of things to investigate and consider in advance, such as basic information on the ground and groundwater conditions according to ISO 22282-1; the required drawdown and/or the required discharge rate during the test; the discharge point for the pumped water and its location relative to the test well; the duration of the test.5.1.2 Determining the discharge rate for the pumping testThe discharge rate Qdmust be estimated to ensure that the test well can yield sufficient water, to allow a pump of appropriate capacity to be selected, and to ensure that the discharge can be accepted at the agreed disposal point.The discharge rate can be estimated by one or more of the following methods based on the purpose of the test and experience of local conditions; by theoretical assessment of the well capacity, according to the method described in Annex B; by analysis of information from the preliminary pumping phase, according to the method described in Annex B.5.2 Arranging the disposal of discharge waterThe disposal of discharge water shall be in accordance with relevant rules and regulations.If the discharge water is not disposed of via an engineered sewer network, it shall be disposed of at sufficient distance from the test well that it will not have a significant impact on the observed pattern of groundwater lowering. ISO 2012 – All rights reserved 3Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.Copyrighted material licensed to Dublin Institute of Technology by SAI Global www.saiglobal.com, downloaded on 12 Jul 12 by Ann McSweeney.No further reproduction or distribution is permitted. Uncontrolled when printed.ISO 22282-42012E5.3 Executing and equipping the well5.3.1 Design of the test wellThe test well shall be designed to satisfy the following criteria see Figure 1 of sufficient depth to penetrate below the groundwater level in the strata of interest. If the test well does not fully penetrate the aquifer, it shall penetrate the saturated part of the aquifer to a depth of at least 25 times the well screen diameter with a minimum of 3 m; of sufficient drilled diameter to accommodate the necessary filter materials and well screen of sufficient diameter to accommodate pumping equipment of adequate capacity to achieve the required discharge rate; with sufficient length and capacity of well screen to ensure that the required discharge rate can be achieved; to have appropriate filter material to ensure that the discharge water contains an acceptably low sediment content to avoid the risk of pump damage and ground settlement as a result of the removal of fine particles from the soil. Where the well is constructed in a stable rock, it may be possible to construct a test well without the need for filter material.The filter material shall be a highly permeable granular material of closely controlled particle size, and be formed of grains of inert minerals in relation to the aquifer groundwater chemistry e.g. quartz, feldspar. In granular soils, the filter’s grading curve shall satisfy the double inequality5 d15 soil≤ d15 filter≤ 5 d85 soilwhere dNdesignates the characteristic size of the filter or of the ground in place, such that the mass of the so

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