BS 7755-5.2: Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:36:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BRITISH STANDARD 1996 ISO 10573: 1995 Soil quality Part 5: Physical methods - Section 5.2 Determination of water content in the unsaturated zone Neutron depth probe method ICS 13.080 BSi BS 7755-5.2:1996 BSI Committees responsible f for this British Standard The preparation of this British Standard was entrusted by Technical Committee EH/4, Soil quality, to Subcommittee EH/4/5,Physical methods upon which the following bodies were represented: Associationof Consulting Scientists British Society of Soil Science Cambridge University Institute of Hydrology Institution of Civil Engineers Macaulay Land Use Research Institute Soil Survey and Land Research Centre University of Glasgow University of Stirling University of Ulster This British Standard, having been prepared under the Bank direction of the Health and Environment Sector Board, was published under the South authority of the Standards Board and comes into effect on Amendments issued since publication S 15 August 1996 London Amd. No. Date Comments BSI 03-2000 The following BSI references I Copy: relate to the work on this standard: Committee reference EH/4/5 Licensed Draftforcomment 92/503316DC ISBN0580259498 BS 7755-5.2:1996 Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normativereferences 1 3 Definitions 1 4 Principle 1 5 Apparatus 2 6 Procedure 2 7 Expression of results 4 8 Accuracy 4 6 Test report 5 AnnexA (informative)Backgroundinformationforthecalibration of the neutron depth probe 6 Annex B (informative) Field calibration 7 Annex C (informative) Reference counts 9 AnnexD (informative)Precisionandapplicabilityoffield calibration curves 9 Annex E (informative) Bibliography 11 List of references Inside back cover CBSI 03-2000 1 BS 7755-5.2:1996 National foreword This Section of BS 7755 has been prepared by Subcommittee EH/4/5 and is identical with IS0 10573:1995 Soil quality-Determination of water content in the unsaturated zone- Neutron depth probe method, published by the International Organization for Standardization (ISO). ISO10573was prepared bySubcommittee 5,Physical methods,ofTechnical Committee ISO/TC 190, Soil quality, with the active participation and approval of the UK. BS 7755 is being published in a series of Parts subdivided into Sections and Subsections that will generally correspond to particular International Standards. The Parts of BS 7755 are, or will be, as follows. -Part 1: Terminology and classification; - Part 2: Sampling; Part 3:Chemical methods; Part 4:Biological methods; Part5:Physicalmethods. Cross-references. The Technical Committee has reviewed the provisions of the draft of ISO 11272 and ISO 11461, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. Textual errors. When adopting the text of the International Standard, the textual errors listed below were discovered.They have been marked in the text and have been reported to ISO in a proposal to amend the text of the International Standard. In 6.2, the second sentence of paragraph 5 should read "To meet the requirement for time invariant gradients, the calibration shall not be conducted after heavy rain or irrigationapplications,orimmediatelyafterthe suddenbeginningofvery warm weather." In A.3, the first sentence in item a) should read "This is characterized by a constant vertical distribution of water content (steady-state water content profile), for given soil water potential conditions in the unsaturated soil (pressure head, h) and a given depth d of the phreatic level (groundwater level), the so-called state variables." In A.3, paragraph 4 of item b), in lines 9 and 10 delete"hydrostatic pressure distribution"; in line 17, delete"Inversely"and substitute"Conversely" In B.2, the second sentence of paragraph 4, delete“de