1、November 2010 Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 07.060!$l1R“1731447www.din.deDDIN EN 13798Hydrometry Specification for a reference raingauge pitEnglish translation of DIN EN 13798:2010-11Hydrometrie Spezifikation fr eine Grube fr Referenz-RegenmesserEnglische bersetzung von DIN EN 13798:2010-11Hydromtrie Spcification pour une fosse de rfrence d
3、installation dun pluviomtreTraduction anglaise de DIN EN 13798:2010-11SupersedesDIN EN 13798:2003-01www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1411.10 DIN EN 13798:2010-11 2 A comma is used as the decimal marker. National fore
4、word This standard has been prepared by Technical Committee CEN/TC 318 “Hydrometry” (Secretariat: BSI, United Kingdom). The preliminary work was done by Working Group WG 12 “Measurement of rainfall intensity”. The responsible German body involved in its preparation was the Normenausschuss Wasserwese
5、n (Water Practice Standards Committee), Working Committee NA 119-06-10 AA Hydrometrie. Amendments This standard differs from DIN EN 13798:2003-01 as follows: a) the standard has been technically revised; b) new figures and recommendations for the design in analogy with the WMO project “Field Interco
6、mparison of rain intensity gauges” have been included. Previous editions DIN EN 13798: 2003-01 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13798 June 2010 ICS 07.060 Supersedes EN 13798:2002English Version Hydrometry - Specification for a reference raingauge pit Hydromtrie - Spcification po
7、ur une fosse de rfrence dinstallation dun pluviomtre Hydrometrie - Spezifikation fr eine Grube fr Referenz-Regenmesser This European Standard was approved by CEN on 26 May 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this E
8、uropean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (En
9、glish, 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgar
10、ia, Croatia, 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 S
11、TANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13798:2010: EEN 13798:2010 (E) 2 Contents Page F
12、oreword 3Introduction .41 Scope 52 Design and construction of the reference raingauge pit .53 Design and construction of the grating.54 Installation of raingauges .5Bibliography . 12DIN EN 13798:2010-11 EN 13798:2010 (E) 3 Foreword This document (EN 13798:2010) has been prepared by Technical Committ
13、ee CEN/TC 318 “Hydrometry”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2010, and conflicting national standards shall be withdrawn at the lat
14、est by December 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13798:2002. According to the CEN/CEN
15、ELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuan
16、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 13798:2010-11 EN 13798:2010 (E) 4 Introduction A raingauge pit consists of a pit, normally square in plan and of suitable depth, and a grating, normall
17、y of galvanised sheet steel or plastic. Such a pit can contain any suitable type of raingauge. The pit gauge may be used in its own right for improved measurement of rainfall, for wind effects evaluation or for comparison purposes against other reference raingauges. DIN EN 13798:2010-11 EN 13798:201
18、0 (E) 5 1 Scope This European Standard specifies the design of a reference raingauge pit. The reference raingauge pit is designed for the liquid precipitation only. The specified details of the pit and the grating, are purposely kept to a minimum in order to allow each raingauge operator latitude in
19、 their construction and to suit local conditions. 2 Design and construction of the reference raingauge pit Figures 1 to 6 show the design of the pit, including the required dimensions of the pit and the grating, and the method of installation of the raingauge. The specified dimensions are not critic
20、al, but shall be used whenever possible. Variations are acceptable within the indicated tolerances. The pit shall preferably be sited on level ground to avoid possible surface runoff into it during prolonged heavy rain. However, in mountainous areas, this may not be possible or desirable and adequat
21、e drainage shall be provided in such cases. The sides of the pit shall be formed of brick, concrete, corrugated iron, plastic, preserved wood or other suitable material. They shall be supported to prevent collapse. Supports shall be provided around the edges, or at the corners of the pit, on which t
22、o rest the grating. The grating shall either be strong enough to walk on, or be made in two sections to allow half to be lifted, to give access to the raingauge. The base of the pit shall be adapted and deep enough to allow the correct installation of the raingauge and the levelling. The base of the
23、 pit shall also allow water to drain. For drainage an overlay of gravel or other suitable material may be used but for high precipitation rate places a suitable pumping system may be used. It may be located in a central recess (extra depth). Plastic sheeting laid over bare soil shall not be used if
24、it does not permit water to drain quickly away. Weed growth shall be prevented either by weeding or by periodic application of weed killer. The surrounding grass should be maintained well and kept without weed. The maximum height of the grass should not exceed 2 cm. The gratings shall be kept free o
25、f debris, (cut) grass and leaves. The pit shall be at least 300 mm deep. 3 Design and construction of the grating The grating shall be constructed from material sufficiently strong to maintain its shape without distortion. The strips of the grating shall be not more than 5 mm thick, to prevent splas
26、hing from their top surfaces. The top of the grating shall equalize the level of the soil or grass. Grating distance shall be (125 5) mm. NOTE 1 Thickness will depend partly, however, on the material used, such that in the case of galvanised steel, 2 mm will probably be sufficient. NOTE 2 The gratin
27、g should preferably be of galvanised sheet steel, but can be of plastic or wood or other suitable material. Aluminium could be a good compromise. NOTE 3 Rounding off the top surface of the grating will decrease splashing. 4 Installation of raingauges The orifice of the raingauge shall be level with
28、the top of the grating and centred. DIN EN 13798:2010-11 EN 13798:2010 (E) 6 To prevent in splash from the grating, the side of the central square space of the grating shall be approximately between 200 mm and 300 mm larger than the diameter of the raingauge collector. In order to match this require
29、ment, the square space of the grating shall be adapted according to the raingauge collectors diameter. Figure 1 General arrangement of raingauge pit and its grating as appearing at ground level DIN EN 13798:2010-11 EN 13798:2010 (E) 7 Key 1 grating 2 ground level (soil and grass) 3 pits sides (brick
30、s in this example) 4 pit recess Additional recess for drainage Figure 2 3D images of complete pit and its grating DIN EN 13798:2010-11 EN 13798:2010 (E) 8 Key 1 4-fold pit sides (bricks in this example) 2 pits internal sides (bricks in this example) 3 concrete base for reference rain gauges installa
31、tions 4 pit recess Additional recess for pumping system and drainage Figure 3 3D images of the realization of 4-fold Pit (4 reference raingauge pits) Reference raingauge pits of WMO Field Intercomparison of rain intensity gauges (Vigna di Valle, Italy) DIN EN 13798:2010-11 EN 13798:2010 (E) 9 Dimens
32、ions in millimetres Key 1 plan view (at ground level) 2 rain gauge at the centre of grating (first example: 160 mm diameter 200 cm2surface) 3 rain gauge at the centre of grating (second example: 357 mm diameter 1000 cm2surface) 4 side view Figure 4 Detail of grating, its central square and rain gaug
33、e DIN EN 13798:2010-11 EN 13798:2010 (E) 10 Dimensions in millimetres Key 1 ground level (soil/grass) 2 grating 3 pit sides or support corners 4 rain gauge, mast and installation base 5 optional installation grating and water collector for drainage 6 optional additional recess for pumping system and
34、 drainage 7 drain pipe H Height Figure 5 Vertical section through a raingauge pit and its grating DIN EN 13798:2010-11 EN 13798:2010 (E) 11 Figure 6 Example of realization: 4-fold pit - Reference rain gauge pits of WMO Field Intercomparison of rain intensity gauges (Vigna di Valle, Italy, 2007) DIN
35、EN 13798:2010-11 EN 13798:2010 (E) 12 Bibliography 1 FOLLAND, C. K. Numerical models of the raingauge exposure problem, field experiments and an improved collector design. Q. J. R. Meteorological Society, 114, pp 1485-1516. 1988 2 INSTITUTE OF HYDROLOGY. Selected measurement techniques in use at Ply
36、nlimon experimental catchments. Institute of Hydrology Report No. 43. 1979 3 RODDA, J. C. The rainfall measurement problem. Proceedings. Bern Assembly IAHS, pp 215-231. 1967 4 SEVRUK, B. & HAMON, W. R. International comparisons of national precipitation gauges with a reference pit gauge. WMO Instrum
37、ents and Observing methods, Report No 17, WMO/TD-No. 38. 1984 5 STRANGEWAYS, I. C. Back to basics: The “met. enclosure”: Part 2(b) - Raingauges and their errors. Weather, 51, pp 298-303. 1996 6 WMO. Guide to Meteorological Instruments and Methods of Observation. WMO No 8. Edition. 2008. (Known as th
38、e CIMO Guide) 7 WMO ET/IOC Surface base Intercomparison and Calibration Methods Final Report 3rd Session Vigna dI Valle, 26 February-01 March 2007 8 Monthly weather review Methods and Results of definite rain measurements III Danzing Report (I) Prof. Dr. H. Koschmieder (January 1934) DIN EN 13798:2010-11
