WORLD METEOROLOGICAL ORGANIZATION
COMMISSION FOR HYDROMETEOROLOGY
ABRIDGED FINAL REPORT OF THE THIRD SESSION
Geneva, 9·21 September 1968
I WMO· No. 239. RP. 79 I
Secretariat of the World Meteorological Organization • Geneva • Switzerland 1969 © 1969, World Meteorological Organization
NOTE
The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the Secretariat of the World Meteorological Organization concerning the legal status of any country or territory or of its authorities, or concerning the delimitation of its frontiers. III
CONTENTS
Page
List of persons attending the session ...... I ••••••••••• VI
Agenda •• -•• 1-'"-••' •• -, ••- ••••.• 1-••.•••", ...... I ...... ,...... "IX General summary of the work of the session ...... 1 Resolutions adopted by the session ...... 34
Se~sion No. 1 4.,1/1: :Working Uroup on the Guide and Teohnioal Regulations in Hydrometeorology ...... 34 2 Working Group on Instruments and Methods of Obse;vation 35
3 "Rapporteur on Instruments ...... 36 4 Working Group on Water Level and Stream Disoharge Measuremen t ...... I 37
Rapporte'ur on "Lake Evaporation ••• I ••• I •••• I •••• 'I ••••••••• }'8
6 Rapporteur on Network Design ••••••••••••••••• I • I • I ••• I •••
7 Working Group on Representative and Experimental Easins .. 40
8 Working Group on Hydrological Foreoasting • I I I •••••••••••• 41 9 Rapporteur on Maximum Floods ...... 43
10 'Working Group on Hydrological Design Data for Water
Resouroes Projects • II •••••••••••••••••••••••••• I ••••••••• 43
11 Working Group on Hydrological Aspeots of the World Weather Va tah ••••••••••••••••••••••••••••••••••••••••••••• I •••••• 44
12 9. 2/1 Working Group on Maohine Processing of Hydrometeorologioal Ds. ta •••••••••••• I •••••••••••••••••••••••••••••••••••••••• 45
.' 13 10 .1/1 Rappo_rt~ur: on Training in Hydrology ...... 4(\
14 11.2/1 Rapporteur on Terminology in Hydrology ••••••••••••••••• I • 47
15 1,1.3/1 Ra:p~orteur on Universal Deoimal Claesifio.ation in Hydrology 48
16 13.2/1 Rapporteur on Continental Drought ...... 49
17 16/1 Advisor,y Working Group •••••••••••••••••••••• , •••••••••••• IV CONTENTS
Resolutions (continued) Session No. 17/1 Revision of the resolutions and recommendations of the Com mission for Hydrometeorology ••••••••••••••••••••••••••••• 50
Recommendations adopted by the session •••••• 0 ••••••••••••••••••••• to •••••••• 52
Final Session No. 110. 1 4.1/1 Technical Regulations in HYdrometeorology and Hydrometry •• 52
2 5.2/1 Information about organization of Hydrological and Hydl1o- meteorological Services of Member countries ••••••• ,...... 5?
3 5.2/2 Co-ordination between Members' meteorological, hydrological _~nd other services concerned ••••••••••••••••••••••••••••• 53
4 6.1/1 WMO participation in the HID programme on the World W~ter Balance ...... , ...... 53 5 7.2/1 vnVIO/IHD projeot on hydrological forecastin9' ...... , 54
6 ll.l/l WMO publications in the field of interest of CHy ...... 55 7 11.2/1 WMO/Unesco Joint Project on Terminology ...... , ...... 55 8 14.1/1 mm participation in the IHD ...... 56
9 14.4/1 ~ong-term plan of aotion in hydrology ••••••••••••• , ••• ,.. 57
10 17/1 Revision of resolutions of the Executive Commit~ee based on previous recommendations of the Commission for Hydrometeo- " rology ...... , ......
Annexes I Annex to paragraph 3 of the General Summar,y Relevan t "points of the report of the Panel. of Experts for the IHD " 59
II Annex to paragraph 5.1 of the General Summary Recommendations to HMO of the lED Ad Hoc Working Group on Network Planning and Design. •••••••••••••••••••••••••••••••••••••••••••••• , 63
III Annex" to paragraph 11.1 of the General Summary List of WMO publications in the field of hydrOlleteorology published bet',,· e'en CRy-II an' a CRy-III ••••••••••••••••••••••••••• , ••••••• t •••• 64
IV Annex to paragraph 12".1 of the General Summary Information concerning technical assistance provided by WMO in the field of hydrome"teorology ••••••••••••••••••••••••••••••••••••••••• 65 CmTTEl!TS v
Annexes (oontinue~) V Annex to paragraph 14.3 of the General Summar,y Provisional calendar.of symposia planned in the framework of the IHD for 1968-1974 ...... 68 VI Annex to 'paragraph 17 of the General Summary Previous recommendation of the Commission kept in force ...... 69
List of documents ...... 70 URDAN I SATIUM MErEnRnlUOI QUE MUNUIAlE • WU RlD MHEU NUL UDI CAl URBAN IZITI UN
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SECRETARIAT T olex: 23260 Telephone: 346400 Case postale N° 1 GEN EVE - Suisse Telegrammes: METEOMOND GENEVE CH -1211 Geneve 20
No. 19.544/T/rrC GENEVA, Annex, 1
Subjeot Supplement to the Abridged Final Report of the third session of the Commission for Hydrometeorology Action required Document to be inserted in WMO Publication No. 239.RP.79
Dear Sir,
I have pleasure in sending you herewith a copy of the document entitled "Decisions of the Executive Committee on the Abridged Final Report of the third session of the Commission for Hydrometeorology". This document is distributed in accordance with the instructions of the Executive Committee in connexion ,vi th reports of sessions of Technical Commissions.
I should like to suggest that this document be inserted in the above-mentioned report contained in WMO Publication No. 239.RP.79, in order to ensure that it is used as guidance concerning the status of the various decisions adopted by the Commission at its third session.
Yours faithfully,
-\ :\,-:;\-,-'-+\_~,r-- Q...... _~S)..'>'-~_h ...... ).·...... ->
for (D.A. Davies) Secretary-General
To all recipients of the Abridged Final Report of C}tr-III who are not Permanent Representatives of Wlm Members (MC-1506)
cc , President of CF~ ) Members of CHy working groups and ) (for information) CRy rapporteurs who are not members ) of the Commission ) ,IORLD METEOROLOGICAL o R G A N I Z A T ION ====c======
Supplement to l,/MO Publication No, 239.RP. 79
Decisions of the Executive Committee on the Abridged Final Report of the third session of the Commission for Hydrometeorology
This. document sn'ould be considered as a guide to the status of the decif';lt.ons adopted at the fourth session of the Commission for Hydrometeorology.
*
* * - 3 -
A. DECISIONS RECORDED IN ~HE GENERAL SUMMARY OF THE TWENTY_FIRST SESSION ~O~F~TH~E~E~X~E~C~U~T~I~~OMMITTEE
.,Hydrometeorology and the International E;ydrologioal Decade (Agenda item 4.15)
The Executive Oommi ttee noted ;7i th appreciation the report of the President of OHy. It noted in particular that the third session of the Oommission, held in Geneva, considered and,made specific recommendations on vrno partioipation in the International RYdrologioal Decade, in addition to the ongoing and future programme of the Oommission.
4.15·2
The Executive Oommittee noted that Reoommendations 4, 5, 7 and 8 (ORY-III) pertain to the IHD as mentioned above and reoorded its deoisions on them in Resolution 26 (EO-XXI).' In this oonnexion, i t weloo~ed the presenoe at the session of the Ohairman of the UNESCO/IHD Co-ordinating Council, Mr. I. Cheret, and expressed its appreoiation of his statement and his participation in the discussion.
The decisions on Recommendations 1, 2, 3, 6 and 9 (ORY-III) were included in Resolution 25 (EC-XXI). The Executive Committee's particular attention was devoted to Reoommendations 1 and 9. In this connexion, the representative of UNESCO, Mr. J.A. da Costa, presented a statement on behalf of the Director-General of UNESCO. He expressed the concern' of the UNESCO Secretariat over the ,proposals of the CRY concerning its terms of reference and the organization of the WMO Inter governmen tal Conference on RYdrology wi thin a few mon ths of the Mid-Decade Conference, which he oonsidered entailed duplioation of the work of lllifESCO and ,other lllil agenoies.
The Executive Committee took full cognizance of this statement in its deliberations and decisions pertaining to the above-mentioned reoommendations.
4.15.3 With respect to Recommendation 1 (CRY-III) some members of the Exeoutive Commi ttee expressed the need for clearer spec'.fication of the terms of referenoe of the WMO Teohnical Conference on Technical Regulations in Hydrometeorology, proposed by CRY-III. The question of possible overlap of this oonferenoe with the UNESCO - oonvened oonferenoe on the interim results and future programme of the International }~drologioal Deoade was raised in partioular. To remove any doubts in this regard, the Executive Committee felt it neoessary to speoify in detail the terms of refer ence of the ~ID Teohnioal Conferenoe and indioated them in oonnexion with Reoommend ation I (ORY-III) in its Resolution 25 (~C-XXI). - 5 -
B. RESOLUTIONSOF THE TWE~Y_FIRST SESSION OF THE EXECUTIVE CQWITTEE
.!1esolution 2,) (E~]l
REPORT OF TllE THIRD miSSIGN OF THE COMMISSION FOR HYDRmlETBOROLOGY
THE jiJXECUTIVF. COMMITTEE,
RAVING CONSIDERED the report of the third session of the Commission for Hydrometeorology,
(1) 'rhe report,
.(2) The resolutions adopted by the third session of the Commission, without .comments,
DECIDES
(1) To take action on Recommendations 4, 5, 7 and 8 (CRy-III), as indicated in Resolution 26 (mO-XXI),
(2) To take action as follows on the other reoommendations :
Reoommendation 1 - Technical Regulations in hydrometeorology and hydrometry .
(a) Approves this reoommendation;
(b) Authorizes the SeoretarY-General, in consultation with the President of CHy and its Advisory VTorking Group, to convene in 1970 a VTMO Technioal Conferenoe with the following terms of referenoe ,
(i) To consider· the manner in "hich to supplement the VTMO Techilioal Regulations to.inolude the present responsibilities of VTMO in the field of hydrology so as to best serve the needs of both Meteorologioal and Hydrological Servioes~
(ii) To oonsider the draft ohapter of WMO Teohnioal Regulations which deals ..,ith hydrometeorology and inoludes topios on hydrometry;
(iii) To consider the >rays in ..,hioh the VTorld Weather 1,atoh oan be planned and developed so as to be of maximum benefit to Hydrolo gioal Services of Members, particularly in the field of hydrolo gioal foreoasting, - 7 -
(ii) Researoh, development, improvement and promotion of methods, procedures and techni~ues in design of networks and standardiza tion of instruments and methods of observation and the operational phases of hydrologioal forecasting, and supply of meteorologioal and related hydrological data for the design of projects,
Directs the Seoretary-General to prepare ap?ropriate proposals in this regard, in consultation with the President of CRy and its Advisory Working Group, for submission to Cg-VIi
It further direots the Secretary·-General to present, in oon!3ul tation with the EO Panel of Experts on IHD, the views expressed in RECOTh@ffiNDS (1) to the IRD Mid-Decade Conference;
(b) Direc ts the Secre tary-GeneI'al, wi th respec t to RECOr![NENDS (2), to refer to Cg-VI the proposed amendments to General Regulations, ooncerning the change of the name of the Commission and its terms of reference as sub· sequently drafted by the CHy Advisory Working Group;
(0) Approves RECOM11ENDS (3) and (4) and re~uests the Secretary-General, tho President of CU;\, and its Advisory Working Group to take the appropriate aotion, also in aoccrdanoe .,ith the deoision of the Exeoutive Commi ttee on Reoommendation 1 (CHy-III);
(d) Requests the President of CHy and its Advisory clorking Group to prepare proposals of ways whioh would provide for adequate aoknowledgementof the views of Hydrological Servioes of MemberfJ in the aotivities of HMO in hydrology and to submit then to EC-XXII. - 9 -
Resolution 26 (EC-XXI)
\JMO PAHTICIPATION IN THE IHD
TIDTI EXECUTIVE COl'lMITTEE,
HAVING CONSIDERED the information on the aotivities of the Organba tion in the International Hydrologioal Deoade presented by the Secretary-General,
CO~1FIRl'1S
(1) The follmdng oOffi:posi tion of the Panel of Experts on the IHD as nominated by the President, in aooordanoe ~Ji th Resolution 16 (EC-XX)
Professor E.G. Popov (U.S.S.R.) President of CHy (Chairman)
r1I~ .• J. Rodier (France) Vioe-President of CHy (member of CHy) . Mr. M.A • Kohler. (U.S.A.) (member of CHy) Mr. D.N. Body (Australia) (member of CINO) Professor R.C. Sutcliffo (U.K.) (member of CAS) Vrr. U. Mane (Israel) . (member of CC1) (2) The terms of referenoe of the Panel as given in the annex to this resolution, REQU-ESTS the Panel to meJce proposals to the Exeoutive Committee for revision of its terms of reference as and "Then the need arises, DECIDES to take action as follows on recommendations of CHy-III oonneoteo. with l'IT10 partioipation in the HID
Heoommendation 4 \1\10 partioipation in the IHD Programme on the Forld ';Tater Balanoe
Approves this reoommendation.
Reoommendation 5 - i"IMO/IHD Pro,jeot on Hydrologioal Foreoasting Approves this reoommendation.
Reoommendation 7 - ~JMO/illiIESCO Joint Pro,jeot on Terminology Notes this reoommendation and tho action of the Secretary-General for its implementation. - 11 -
Annex to Resolution 26 (EC-XXI)'
TERMS OF REFERENCE OF THE PANEL OF EY~ERTS
FOR THE INTERNATIOl~AL HYDROLOGICAL DECADE
The terms of referenoe of the Panel of Experts for the International Hydrological Decade are as follol'lS : (1) To consider and promote the programme of V-IMO participation in the International Hydrological Decade and to make recommendations to the President of V-IMO or the Executive Committee, as necessary;
(2) To give advice to the Secretary-General, the Commission for Hydro meteorology and its 1'1Orking groups concerned, on the implementation of the decisions taken by the constituent bodies ;,i th respect to hydrometeorology, and on other urgent matters, as may be considered necessary for the fulfilment of the ,,/MO Programme for the International Hydrological Decade;
(3) To maintain, through the SecretarY-General, close collaboration with the Co-ordinating Council for the International Hydrological Decade and with appropriate bodies of ICSU, and to be fully informed on developments of the whole project of the International Hydrological Decaa.e;
(4) To report, together "ith the President of CHy, to each session of the Executive Committee, on the developments and progress in the Inter national Hydrological Decade, particularly as regards the part carried out by I'-IMO. VI
LIST OF PERSONS ATTENDING THE SESSION
l, Officers of the session M. A. Kohler president z. Kaczmarek vice-presiden t
2. ReEresentatives of Members of WMO S. Daoud principal delegate Algeria D. N. Body prinCipal delegate Australia J. Cunneen delegate F. Steinhauser principal delegate AustriCJ. H. Schimpf delegate L. J. Tison principal delegate Belgium P. J. P. Pereira principal delegate Brazil A. Glomozda principal delegate Byelorussian S.S,R. T. L. Richards principal delegate Canada M. Hendler delegate R. H. Clark delegate M. Epoy principal delegate Cameroon V. Kriz principal delegate Czechoslovakia J. VAsa delegate
A. Llano Eck principal delegate Chil~ A. Siren prinoipal delegate Finland P. Malkki delegate R. Arlery principal delegate Franoe Ph. Picq delegate J. Rodier delegate 1. Serra delegate
G. Seifert principal delegate Germany t Federal Republic of H. J. Liebscher delegate M. Marroquin NAjera principal delegate Guatemala K. E. D. Potter principal delegate Gu,yana G. Peczely principal delegate Hungary K. N. Rao principal delegate India
w. A. Morgan principal delegate Ir~land U. Mane principal del ega te Israel M. Jacobs delegate E. Rosini delegate Italy V. Cantu delegate A. Fantoli delega te LI_~T OF PERSONS :ATTElIDING THE SESSION VII
2. Representatives of Members of WMO (oontinued) K. Agematsu principal delegate Japan
Hi ku Cho prine ~ pal dele'ga ts Korea, Republio of L. J. L. Dey principal delegate Netherlands J. W. van der Made delegate K. R. Pos·tma de1egate A. Volker delegate A. Jakhelln p'rincipa} delegate Norway J. Otnes deiegate E. R. de Nottebohm pTiridi-pal delegate Panama Z. Kaczmarek. principal delegate Poland A. Silva de Sousa principal delegate Portugal J. M. da Rocha Faria delegate M. Podani principal delegate Romania D. Tall principal delegate Senegal " - G. Sprinchorn prinoipal delegate Sweden E. Walser principal delegate Swi tzerland P. Kaeser delegate Vesa-Rajananda Sanit prinoipal delegate Thailand Chareonsook Dumrong delegate M. 'Ketata 'prin6ipal del ega te Tunisia U. CBlasan p-rinbipal delegate Turkey N. Ilgaz deleKf?t.e S. Tcherkavsky principal delegate Union of Soviet Soo.ialist E. Popov 'delegate Republios N. Aksarin delegate T. Denissova delegate J. Harding principal delegate United Kingdom of Great A. Bleasdale delegate Bri tain and Northern J. G. McCullooh delegate Ireland J. lnssall de lega.te.. J. C. Rodda delegate W. E. Hiatt principal delegate United States of Amerioa H. B. LanJ'l.J1,·in delegate F. F. Snyder delegate H. C. Storey delegate R. W. Carter delegate G. D. Cartwright delega te J. A. Battione Chiarino principal delegate Uruguay R. D. Markovic principal delegate Yugoslavia
3. Observers
E. A. "Bernard Uni ted Nations Development Programme (mTDP) VIII LIST OF PERSONS ATTENDING THE SESSION
3. Observers
(a) Intergovernmental organizations (continued) ------~------Ae Pichler-Stainern United Nations Eoppomic Commission for Europe (ECE) E. Jane W. Dill Food and Agricultural Organization (FAa) H. W. Underhill
J. A. da Costa United Nations Eduoational, Soientifio an~ Cultural Organizatiop (Unesco) V. B. Vouk World Health Organization (WHO) L. Goda Danube CommisEii on
(b) Other------organizations T. L. Richards International Union of Geodesy and Geophysics (IUGG) L. J. Tison International Association of Scientific HYdrology (lASH) M. Rigby International Federation for Docume~~atiQn (Flp)
4. Individual expert S. MUller
5. Conference secretariat
J. N~mec Representative of the Seoretar,y-Oeneral of WMO M. Blanc Technical Secretary, WMO Seoretariat
T. Palas Technical Secret~r.r, WMO ~ecretariat O. M. Melder Technicql Seoretary, WMO Secretariat IX
AGENDA
Agenda item Relevant No. doouments Opening of the session Pink 38
2. Organization of the session (2), Pink 37 2.1 Consideration of the report on (2), Pink 37 credentials 2.2 Adoption of the agenda 1, Rev.l, 2, Add.1; (47), Pink 37 2.3 Establishment of committees (2), Pink 37 2.4 Other organizational questions (2) 1 Pink 37
3. Report by the presiden t of the 5, Add.l; 22, Add.l; Commission 391 Pink 41
4. General guidance material and standardization
4.1 Guide to Hydrometeorologioal 251 301 )0, App. A, 1 1 Praotices and Teohnioal Regula Corr.1! 341 37; Pink 23 tions in hydrometeorology Instruments and methods of 15! 16; 29; 40; Pink 40 2, 3 observation Water level and discharge 17; Pink 24 4 measuremen t 4.4 Improvement, oomparison and 14! Pink 36 standardization of hydrologioal instruments and techniques 4.5 Evaporation losses from lakes 1, Rev.l; (2, Add.l); 5 and reservoirs 50; 52; Pink 27 Influenoe of freshwater dis- 471 Pink 20 charge on salinity of tidal streams
5. Network design 5.1 Symposium on Network Design and 28! Pink 5 6 subsequent aotivities Organization of national Hydro 9, Pink 9 2, 3 logical and Hydrometeorological Services
NOTE When the number of a dooument is placed in brackets, this means that the item on the agenda is dealt with in that document but that the document concerned is not devoted entirely to that item. x AGENDA
Agenda. ~ Relevant No. documents 6. World lfa. tar Balanoe and represen ta tive and Gxperimental basins 6.1 World Water Balance 13; 27; 39; Pink 8 4 6.2 Representa.tive and. experimental. 3; Pink 34 7 ba.sins
7. Rydrologioal foreoasting Working Group on HYdrological 42; 45; Pink 15 8 Foreoasting Australian symposium and related 7; 39; Pink 16 5 W!rIO aotivi ties in hydrological foreoas ting Wind set-up and seiches 43; Pink 4 Meteorologioal forecasts for 20; Pink 1 hydrological purposes Avalanohe warnings 24; 44; 55; Pink 29
8. Meteorological and ~ydrological data for the design of water resources projects 8.1 Estimation of maximum floods 32; Pink 13 9 8.2 Technioal Note on depth-area 36, Add.l; Pink 17 duration of rainfall 8.3 HYdrologioal design data. for vater 11; Pink 18 10 resources projeots T,yphoon damage oontrol project Pink 3 Storm distribution for short (1, Rev.l); (2, Add.l); durations 51; Pink 30
9. Hydrological aspects of the World Wea.ther Watch Hydrological aspects of the World 38; Pink 25 11 Weather Watch Machine prooessing of hydro 8; Pink 6 12 meteorologioal data Water information systems and 10; 39; Pink 31 related IHD projects
10. Eduoation and training 10.1 Guidance material and report on 19; Pink 19 13 training of hydrometeorologioal personnel AGEN1lA .. lC1
Agenda ~ Relevant !!£.:. documents 10 •. 2 Co-oper~tion with the Co-ordinating 12; Pink 12 Council "for IBD in hydrologioal eduoation and training 10.3 Training seminars 6; Pink 14
11. Publications, terminology. universal decimal classifioation in hydrology
11.1 WMO/IHD reports on other publica- 36, Add.l;'Pink 35 6 tions 11.2 WMO/Unesco Joint Projeot on 23; Pink 21 14 7 Terminology 11,3 Universal decimal classification 18; Pink 22 15 in hydrology
1-2. Technioal assistance and rela-ted projects
Technioal ~ssistanoe 26; Pink 2, Rev.l Water resources consultant team Pink 7
13. Hydrologioal aspects of artificial·· . rainfall and assessment of conti nen tal drought 13.1 Artifioial rainfall 46; Pink 11 13.2 Continental drought (WMO/IHD Report No.2) 16 Pink 26
14. Co-operation with other inter national organizations and symposia 14.1 Co-operation with the IHD Seore 21; 49; 53; Pink 32 8 tariat and other international organizations 14.2 Regional co-operation 35; 48; Pink 28 14.3 Symposia. 31, Add.l; 31, App. A, Rev.l; 31, App. E, Rev.2; Pink 33 14.4 The IHD Mid-Decade Conference and 41; 54; Pink 42, Add.l 9 needs and possibilities for a long term plan of action in the field of hydrology
15. Scientifio lectures and discussions Pink 39
16. Establishment of working groups 4; Pink 10; Pink 43 17 xn AGENDA
Agenda ~ Relevant " .!!£.,.. doouments
17. Review of resolutions and 33 10 recommenda tions adopted at the second session of the Commission and related resolutions
18. Election of officers (2)
Date and place of the fourth (2) session
20. Closure of the session GENERAL SUMMARY OF THE WORK OF TilE SESSION
1. OPENING OF THE SESSION (Agenda item 1)
The president, Mr. Max A. Kohler (U.S.A.), opened the third session of the Commission for HYdrometeorology at 10.00 a.m. on 9 September 1968. The opening ceremony took place in Salle I of the Headquarters Building of the World Meteorologioal Organiza tion in Geneva.
Mr. D. A. Davies, Secretary-General of the World Meteorological Organization, greeted the partioipants and extended a warm personal and official welcome. He mentioned the many international organizations represented and took this as one more indioation of the wide interest in, and importance of, the subjects to be discussed. He expressed confidence that the session would come forward with construotive and far-sighted con clusions.
Sta temen ts were also a.i·iressed to the Cammi ssion by 1"!r. Piohler-Stainern, United Nations Economic Commission for Europe, Mr. J. A. da Costa, representative of Unesco and Secretary of the Co-ordinating Council of the IHD, and Professor L. J. Tison, Secretary-General of .the International Association for Scientifio Hydrology.
Finally, Mr. Max A. Kohler gave his presidential address in whioh he reviewed the, problem areas en:)ountered during the previous two sessions in the light of more reoent developments and presented his views on the more important problems facing the Commission :in the immediate future. He then proceeded to propose guidelines for treat ing these matters in the session. In closing, he expressed his confidence that the Commission would meet its growing responsibilities in a wholly satisfactory manner.
2. ORGANIZATION OF TIlE SESSION (Agenda item 2)
The opening plenary of the thi rd s9ssi on took place in the WMO Headquarters. All other meetings took place in acoommodation made available to WMO by the World Health Organization, through the courtesy of Dr. Candau, Direotor-General of WHO. These faci li'ties "Were in the nearby WHO Headquarters BUilding, Avenue Appia, Geneva. All docu ments "Were produoed in the four w~rking languages of WMO (English, French, Russian and Spanish) and simultaneous interpretation in these languages was provided for all meeti~
There were 86 partioipants at the session. These included representatives from 39 oountries and nine international organizations.
The WMO Secretariat was represented by Professor J. Nemec, Mr. Milton 1. Bl~ Mr. T. Palas and Mr. O. M. Melder.
2.1 Consideration 0"£ the report on credentials (Agenda item 2.1)
The representative of the Secretary-General presented a list of partioipants and the capaoi ties in which they were attending the session. This list was acoepted as the report on oredentials. 2 GENERAL SUMMARY
2.2 Adoption of the agenda (Agenda item 2.2)
The provisional agenda was adopted with the addition of items 4.5, 4.6, 8.5 and 14.4. The final agenda is given at the beginning of this report, together with a list of the relevant doouments of the eeBBion~
2.3 Establishment of oommittees (Agenda item 2.3)
2.3.1 A Nomination Committee was established oonsisting of the principal delegates of the following countries:
RAI Tunisia (M. Ketata) RA II - U.S.S.R. (S. Toherkavsky) RA III - Uruguay (.T. A. Eattione Chiarino) RA IV - U.S.A. (W. E. Hiatt) RAV - Australia (D. N. Eody) RA VI Franoe (R. Arlery)
2.3.2 A oommittee for nominating rapporteurs and members of working groups was established oonsisting of Messrs. Z. Kaozmarek, A. Glomozda, J •. !-larding, W. B. Langbein, U. Mane, K. N. Rao, T.- L. Riohards and J. Rodier.
2.3.3 Two working committees were Bet up to examine in detail the various agenda i temsl
(a) Committee A for items 4, 9, 12 and 13 (inoluding all sub-items) and sub 1tems-773:-7.4, 8.4 and 8.5. Mr • .T. Otnes (Norway) served as -ohaiman, Professor E. Popov (U.S.S.R.) as vioe-obairman and Mr. M. Blanc as secretary!
Commi ttee E for items 3, 5, 6, 10, 11 and 14 (including all sub-i tems) and 8ub-items-7.l, 7.2, 7.5, 8.1, 8.2 and 8.3. Mr • .T. Ineson (U.K.) served as' ohairman, Mr. M. Jaoobs (Israel) as vlae-ohairman and Professor J. N~mec as seoretary.
2.3.4 A Co-ordination Committee was established, consisting of the president and the ohairmen and seoretaries of the two oommittees.
2.4 Other organizational questions (Agenda item 2.4)
Hours of work from 09.30 to 12.30 and 14.30 to 17.30 were adopted.
The Commission approved summary minutes of its first two plenary meetings. It further agreed that the president of CRy approve on its behalf the summary minutes of its other plenary meetings.
3. REPORT BY THE PRESIDENT OF THE COMMISSION (Agenda item 3)
The Commission noted with appreciation the work aarried out since its seoond session. It oonsidered that there were only four items arising from the deoisions of the seoond session on whioh it was.neoessar,y to report under this item. The views of the Commission are reported as follows: GENERAL SUMMARY 3
Excbange of information required for hydrologioal forecasting on riv~r basina extending across the borders of several countries
Recommendation 2 (CRY-II) requested the Secretar,y-General to.
(a) Distribute to Members available information on data-exchange practio~s arranged by the Danube Commission, (b) Contact appropriate international bodies in an attempt to obtain similar information for other international river baains; and (0) Prepare a report on the subject for distribution to Members.
Tbe Commission noted the Secretary-Generalis aotion on this recommendation. Noting that no relevant additional information was received by the Seoretary-General in response to the inquiry, it does not oonsider any further action nece~sary.
Transmission of precipitation data
The Commission noted the information presented by the president that trans mission of precipitation data had been oonsidered by five of the Regional Assooiations and that it was doubtful that further recommendations by the Commission on this matter would be any more fruitful unless speoifio problems could be cited.
It therefore expressed the view that no further action was necessary at that time.
Acouracy reguirements
The Commission was informed by the president that the CIMO Working Group on Aoouraoy Requirements summarized the replies to a questionnaire whioh was oirculat~d ~~ all other Technical Commissions for comment. The presiderit prepared a preliminar.y reply to this questionnaire. At its last session CIMO decided that the information B~mariz ing the replies to the questionnaire Was of permanent value and that the main finding a should be published in the Guide to Meteorological Instruments and Observing Praotices. 'rhe Commission noted that the CIMO working group did not consider elements o-r interep:t only" to CRy, such as stream disoharge, and they did not oover Boil-moisture mfi!asurement. Noting this information, the Commission referred the question of aocuracy of stream dis charges to its Working Group on Water Level and Stream Discharge Measurement and other questions of aoouracy to its Working Group on Instruments and Methods of ObB~rvat~on ~n H~drometeorology.
Executive Committee Panel of Experts for the lED
The Commission noted with appreoiation that the reports of the panel's ses sions were forwarded to members of, the Commission as requested by CRy-Il. It also noted a final report on the panel's aotivity which was presented by the Secretary-General in conSUltation with the chairman of the panel. The Commission considered this report under several items of the agenda relevant to the different subjects oovered by the panel's report. Since the report contains also the information on WMO partioipation in the IHD programme, the Commission considered it useful to oonvey the information in thi~ report to members. The relevant points of the report of the panel were therefore inoluded in Annex I to this report. The Commission also noted that the panel considered the IHD Project on Influence of Man on the Hydrological Cycle. Since CRy-II had suggested that the Seoretary-General oontaot other international organizations to oollect infQrmation on current activities in this field, the panel recommended that WMO be represented in 4 GENERAL SUMMARY
~he_ Working Group of the IHD Co-ordinating Council on Influenoe of Man on the HYdrolo gioal Cyole, thus fulfilling the purpose of the request of Cay-II. The panel is keeping abreast of all the activities in this field in the lED framevork and it is conveying to the president of CHy any r~levant information of interest to the Commission.
Further aotivities of the panel and of WMO partioipation in the IHD pro gramme were oonsidered by the Commission under agenda item 14.1, where all the relevant .decisions of the Commission are reoorded.
Any other decisions of the Commission regarding the IHD programme and further WMO responsibilities in the field of hydrology, as outlined in the report to the presi dent, have been oonsidered under ~genda item 14.4.
4. GENERAL GUIDANCE MATERIAL AND STANDARDIZATION (Agenda item 4)
4.1 "Guide to H drometeorola ioal Practioes and Technioal Re atians in H dro- meteorologY Agenda item 4.1
In taking up agenda item 4.1 there was a general discussion af the basic pro blems and of the philosophy involved in produoing guidanoe material and regulations" covering hydrological Bubjects. The discussion indioated the desirability of oonsider ing this item in two par~B, one dealing with the Teohnioal Regulations and one dealing wi th the Gui de".
The Commission expressed great appreoiation for the report of the Working Group on the Guide and Teohnioal Regulations as presented by its chairman. He referred to the several additional doouments whioh, together, oontained the new material and amendments whioh had been proposed for both the Guide and the Teohnioal Regulations.
TECHNICAL REGULATIONS
The Commission deCided, at its seoond session, that the WMO Technical Regu~ lations shQuld contain seotions covering hydrometeorologioal aspeots. CRy-II approved dr~ft "amendments to the Technical Regulations and requested that these be oirculated fOr oO$ment"by Members.
Comments 'reoeived from Members on these proposed amendments were reviewed by the "Working GrOup on the Guide and Teohnicai Regulations and were incorporated in the revised amendments oontained in a dooument submitted by the Seoretary-General.
It was evident from the replies mentioned above that the proposal to include such amendments raised a number of problems, partioularly in those countries where the Meteorologio·al and Hydrological Services are separate. Furthermore, several delegates indioated" that the inolusion of these items also produced problems in regard to the WMO Convention and with other Commissions.
In vie"w of the fact that the proposed amendments are not "standard" practi,oes and prooedures, but rather Itreoommendedll, it is implied that there is no obligation to follow t~ese praotioes. Therefore, the Commission agreed that, at this time, they could be v~ewed as being guidanoe material.
In order to have this material published at an early date" and also to avoid prObl~~s associated with the modification of the existing Teohnioal Regulations, whioh GENERAL SUMMARY 5 would require the approval of Sixth Congress, the Commission agreed that the substance of the proposed amendments should be included as a new section in Chapter I of the Guide to Hydrometeorological Practices under the ti tIe "Recommended practioes and procedures II. The task of drafting this section was given to the Working Group on the Gui~e and Teoh nioal Regulations.
Al though it has so far not been pasei ble to havE:' sec ti ons deal j ng wi th hydro meteorology included in the Technical Regulations, the Commission continued in the view that such sections would be appropriate. Becauee of the problems 86sccjated with the revision of existing Chapters 1, 2 and 3 of the Technioal Hegulations to include hyd.ro meteorology, the Commission conoluded that it would be more appropriate to prepare a separate chapter dealing uniquely with Technical Regulations in hydrometeorology. The draft. chapter is to be prepared in the first instance by the Working Group on the Guide and Technioal Regulations and subm:' tted to the president for consideration by the Ad viso!'Y Working Group. The chapter is teen to be circulated to Mem-bers for comments.
Although the Commission accepted that agreement might be reached at a later date on some form of Technical Regulations_ dealing with hydrometeor~logy, and that it was appropriate to contin~e drafting such material, it was pointed out that the adoption of Teohnioal Regulations by WMO on some of these topjcs would imply that this Organiza tion is accerted as the appropriate body for defining stanclarrle jn the field of hydro metry. Many natjonal autl.oritiee whioh bave the responsibility for hydrometrio measure ments have no direc+' ansociation wi th tl:e representation of Members to mw.. 1n view of this, the Commission decided to recommend that the EX8cutjve Committee take steps to convene an intergovernmental meeting at which delegations comprising experts of both rneteorologj oal and hydrological agenoies ooul rl di scuss this si tuation prior to the sub mission to Congress of ~he dr~ft Technical Regulations mentioned above.
Recommendation I (CHy-III), proposing such a meeting, was adopted.
Should the Executive Committee decide for some reason against holding such a meeting, the Commission recommends that the hydrological services be consulted on the Technical Regulations by any other means.
After the disoussion on the Techniaal Regulations, which resulted in the decisions recorded above, the Commission agreed that the problem of the Guide consisted o~ two parts. The first involved the aotion neoessary to insert the material available at present in the Guide. The seoond part in'/olved a continuing act'ion to keep the Guide up to date.
To acoomplish the fi.rst part, it was agreed that thE'! material proposed, as moiifiF:1. by the comments received during the session, was acceptable for issue as revi- 3ion8 anj amendments to the 3uide.
To accomplish thl? sacond part, :. t was agreed to assign this task to the Work ing GraUl" on the Guid08 and Technical Regulations. The Commission recognized that at some point it might be advantageous for the working group to utilize the servioes of a cons';lltant to review and edit the entire Guide with a view to improving it~ ~f)ntinuity and organization and also to shortening it by ieleting red~mdant or outrh.ted material.
Resolution 1 (CRy-III) was then adopted coverinG both Guide and '--:Pechnioal Regula tions. 6 GENERAL SUMMARY
4.2 Instruments and methods of observation (Agenda item 4.2)
The Commission examined the report of the Working Group on Hydrometeorologi cal Instruments and Methods of Observation set up by Resolution 2 (CRy-II) and agreed that it had nearly completed its tasks under its tenus of reference (b) and (0). Muoh of the work under reference (a) has yet to be oompleted, namely the drafting of a Tech nical Note on automatic equipment for observing and transmitting hydrometeorological elements, and the preparation of a summary of the Technioal Note sui table for inclusion in the Guide. It was noted with appreoiation that Mr. K. E. Ivanov had agreed to under take the preparation of a draft Note and it was agreed that he should be asked to oom plete the draft 0 It was agreed that the final draft and the preparation of a summary for inolusion in the GUide as well as completion of tasks (b) and (0) were the responsi bility of a working group.
The Commission expressed appreciation to Mr. K. Szesztay (Hungary) for his report as CRy representative on the CIMO Working Group on Measurement of Precipitation. It was agreed that suoh representation Was valuable and that the president of Chy shouJd request representation on any future similar CIMO working groups. The Commission expressed partioular interest in consideration of the aoourate determination of point precipitation at the ground in all terrains. The Commission appreciates the work being done by the CIMO Working Group on Measurement of PreCipitation on the results obtained from the Interim Reference Preoipitation Gauge (lRPG) comparisons. This is a step in the right direction towards standardization of measurement, but it does not go far enough towards attainment of accurate point precipitation measurements at the ground. The Commission noted, however, that the elMO working group is also co-ordinating and collecting information on investigations relating to souroes of error in the measurement of both solid and liquid forms of preCipitation, with special referenoe to aerodynamio effects. In view of this, the Commission agreed that instead of establishing a CRy Working Group on Point Measurement of Preoipitation, it would recommend that the presi dent of CRy suggest to the president of elMO the possibility of re-establishing, at CIMO-V, a Working Group on Measurement of Precipitation, and that CRy should be repre sented thereon. Further, the president of CRy might wish to suggest that the terms of referenoe of suoh a working group include, for example, the collection and co-ordina tion of information on investigations relating to the acouracy and representativeness of point preoipitation measurement at the ground, and ultimate consideration by the working group of the desirability of asking Members to carry out specified investiga tions that offer prospects of a solution to the fundamental problem of preoipitation measure men t.
The Commission read with appreciation the report of Dr. V. A. Ur,yvaev (U.S.S.R.), the CRy representative on the CIMO Working Group on Evaporation Measurement. The Commission noted with interest the progress made towards the selection of an interjm international reference evaporimeter and is looking forward to the report of the working group on this problem. Apart from the problem of a referenoe evaporimeter, the working group terms of reference deal wi th the role of evaporation pans in the study of evapora tion and evapotranspiration and also the possible replacement of evaporation pan measu~ menta by estimates of evaporation from the measurements of definable meteorological ele ments. In view of the great interest of CHy in problems of evaporation loss (see also agenda item 4.5), the Commission recommended that the president of CRy bring this inte.I' est to the attention of the president of ClMO and that he encourage ClMO to re-establiSh its Working Group on Evaporation Measurement at its next session and invite CRy repre sentation. The terms of reference of the new working group might, as now, include the role of evaporation pans in the study of evaporation and evapotranspiration and con sideration of the possible replaoement of evaporation pan measurements by estimates of evapo~ation from the measurements of definable meteo~ological elements. In addition, GENERAL SUMMARY 7 the terms of referenoe could stress the import-anoe of" aoourate determination of eva poration loases from natural and artifioial Btorage~.
The Commission expressed great appreoiation to Mr. Gangopadhyaya (India), CRy representative on the CAgM Working Group on Praotioal Soil Moisture Problems in Agrioul ture. It noted that the report of that group, whioh will oontain last-minute additions up to March 1968, had been oompleted, and expressed great intere~t in its publioation as a Teohnioa1 Note.
The Commission fUrther oonsidered the problem of keeping Members informed of instrument development and standardization. It noted that development of instruments for hydrometeorologioal purposes by various gov~rnments and agenaies within the term. of referenoe of the Commission was of interest to Members.
The Commission also noted with ap~reoiation the report by the Seoretar,y General (agenda item 4.4) on "WMO aotivities in the field of oomparison and standardiz~ tion of instruments and techniques in hydrometeorology. After oonsidering that WMO is entrust~d in this field with primary responsibility to Members, the Commission deoided t? establish a Working Group on Instruments and Methods of Observation to oomplete the tasks already mentioned in the opening paragraph above and to oarry out additional work in the field of hydrometeorological instruments and standardization as contained in its terms of referenoe. Resolution 2 (CRy-III) was adopted.
In oonsidering the several tasks suggested for the working group, the Commie sion deoided that one of them, pertaining to oompilation of lists of recommended instru ments, oould best be handled by a rapporteur. Resolution 3 (CHy-III) va. adopted. The Commission further requested the president of CRy to oall. Resolution 3 (CRy-III) to the attention of the president of erMO with the suggestion that he might wish to oonsider similar aotion regarding other types of instrument.
The Commission took note of section 4.2, on aoouraoy requirements, of' the pre sident's report. It oonsidered that the aotion which had been taken under agenda items 4.2 and 4.3 in establishing two working groups and appointing one rapporteur in the ge neral field of instrumentation was all the action neoessar,y at this time.
The Commission further noted that the Working Group on Hydrologioal Aspects of the World Wsather Watoh (agenda item 9.1) had been designated to oontinue the study on hydrologioal requirements for weather rada-r data and on current oapabili ties in meet ing these requirements. Therefore nothing speoifio on radar had been included in ReBo- 1ution 2 (CHy-III). 4.3 Water level and discharge meaeurement (Agenda item 4.3)
The Commission heard with approval the report of the ohairman of the Working Group on Water Levels and Discharge MeaBurements and Estimation. It expressed great appreoiation for the exoellent oontribution by the group and espeoially by its ohairman Mr. M. A. Benson (U.S.A.), in preparing the material whioh has been published as WMO Teohnical Note No. 90, "Measurement of Peak Discharge by Indirect Methods". In addition, material on indireot methods of ~ea8uring peak flood disoharge and on measurement of ground water levels had been oompleted and submitted for the Guide.
There remain only two items from the terms of reference to be completed. One of these deals with the determination of river disoharge under ioe and the other with weirs, flumes and other stream-gauging structures. Considerable progress has been made on both items, but some work remains. 8 GENERAL SUMMARY
The Commission decided to establish a Working Group on Water Level and Stream Disoharge Measurement to oomplete these tasks, including the preparation of a Technioal Note on weirs, flumes and other stream-gauging structures. It also oonsidered that the same working group should keep stream-measuring instruments under review partioula~ ly for the purpose of standardization and should prepare a report on instruments whioh might be suitable for standardization for the Working Group on Instruments and Methode of Observation. Resolution 4 (CRy-III) was adopted.
In oonnexion with this disoussion, the Commission was reminded of the Sympo sium on Hydrometry to take place in Coblenz in October 1969. It was recommended that the president tr,y to arrange a meeting of this working group in Cob1enz immediately fol lowing the Symposium.
4.4 Improvement 9 oomparison and standardization of hydrological instruments and teohniques (Agenda item 4.4)
The Commmission noted ~ith great interest a report from the Secretar,y-General on WMO activities in the field of oomparison and standardization in hydrometeorology. The report contained proposals on these subjects which the Commission considered under agenda items 4.2 and 4.3. The suggested terms of reference for a working group were incorporated in Resolution 2 (CRy-III) which established the Working Group on Instrumenw and Methods of Observation. The Commission considered that this waa all the action on this item necessary at this time.
4.5 Evaporation losses from lakes and reservoirs (Agenda item 4.5)
The Commission heard with interest papers from the delegates of India and Israel on the need for additional research in methods to estimate probable loss of water from lakes and reservoirs for use in the design of related projects. Several dele gates described work being done in their_countries in relating evaporation-pan data to lake evaporation. During the discussion it was pointed out that the Commission, under agenda item 4.2, had discussed the problems of evaporation and had recommended that the president of CRy request the president of ClMO to invite continued CRy representation on any CIMO working gro~p in this field. It was also noted that under agenda item 8.3 a Working Group on Hydrological Design Data had been established with terms of refer~noe which would inolude oonsideration of some aspects of this problem.
In discussing the erMO working group, it was pointed out that its studies will treat only the oomparjson of evaporation instruments at the sites of the experiments in the countries partioipating. The Commission agreed that Members participating in the elMO comparison programme should also be requested to oonduct studies on the reliabili~ of estimating lake evaporation from these data. The Commission then decided to appoint a rapporteur to oolleot all such studies and report on them at the next session. He could also report on the status of teohniques for reducing evaporation from reservoirs.
Resolution 5 (CRy-III) was adopted.
The Secretary of the IHD Co-ordinating Council informed the Commission of the IHD projeot on evaporation and welcomed WMO activities in this field. The Commission felt that questions pertaining to evaporation were so important to WMO that the Organiza tion should offer to tak~ major responsibility in the lHD project. GENERAL SUMMARY 9
4.6 Influenoe of freshwater disoharge on salinity of tidal streams (Agenda i tam 4.6)
The Commission heard with interest a report from the deleg&te of Guyana on the need for aoourate methods of measuring and predicting saltwater intrusion in tidal streams. Suoh intrusion may be of m&jor importance in stream. where extraction or oon trol is ·,planned and where it i. not praotioaI or eoonomical to s,epara te freshwater from saltwater by engineering YOrk8.
The suggestion was made that it would be useful to summarize existing knowledge on the subjeot. In this oonnexion the Commission wam reminded of the Unesco/ lASH/Romania Symposium on Hydrology of Deltaio Areas to ba held in Buoar.st in May 1969. It vas agreed to request the president of CRy to obtain a report on the results of this symposium, as they apply to the problems of saltwater intrusions, for distribution to members of the Commission.
It was also noted that there is an IHD projeot on estuaries and that WMO will be requested to partioipate in this projeot.
5. NETWORK DESIGN (Agenda item 5)
SYmposium on Netyork Design and subsequent activities (Agenda item 5.1)
The Commission expressed its satisfaction that the problem of netyork design had bean inoluded in the agenda of this session, as had been reques~ed at its last ses sion. It considered a document of the Secretary-Oeneral on the WMO aotivities in the field of network design between its second and third ~ession9 end, particularly, about the Symposium on Network Desigri held in 1965 in Canada and its implementations in con nexion with related aotivities within the framework of the IHD.
It noted that the IRD ad hoc yorking group for yhich WMO served as technical secretariat, in its report to the IBD Co-ordinating Council, made lIev8l'&'1 recommendations, some of which are specifioally addressed to WMO; these recommendations will be found in Annex II to this report. It also noted that the publication by lASH of the proceedings of the symposium vas Buppo.rted by liMO.
The Commission requested the president of CRy to consider, in co-operation with the presidents of CCl and CIMO, the possibilities of implementation of the recom mendations of the IHD ad hoo working group addressed to WMO.
The Commission was informed that the IHD Co-ordinating Council has created a panel of experts with the task of studying all the scientific aspects of the general problems posed by the design, oreation, establishment and operation of networks for ob servation of water quality, sediment transport, groundwater and Boil moistUre. To start with,the panel is to ooncentrate its efforts on the networks of groundwater.
The Commission has oonsidered that network design and operation are central among its responsibilities and, therefore, oonsidered it neoessary to continue its ef forts for further development of WMO aotivities in this field. To this effect, it appointed a rapporteur with tasks specified in Resolution 6 (CRy-III). It a180 recom mended that an expert be appointed by the Secretar,y-General to assist the rapporteur ~ oarrying out these tasks. 10 GENERAL SUMMARY
Organization of national Rydrological and Rydrometeorological Servioes (Agenda item 5.2)
Tne Commission was presented with the result of an inquiry by the Seoretar,y General on the organization of existing hydrological and hydrometeorological Servioes in Member countries. It noted that this inquiry was based on a questionnaire prepared by the Executive Commi ttee Panel of Experts for IBD; on the recommendation of the above-mentioned panel this questionnaire was, in addition, circulated to WMO Permanent Representatives and to all national committees for IBD, with the kind help of the Secre tariat of the IHD at Unesoo~
It was noted. that the tables contained in the annex of the document on organ ization of existing Hydrological and Hydrometeorological Services represented an up-to date status, particularly of information on principal agencies involved in different countries in hydrological and hydTometeorological observations. The Commission was alro informed by the representativ-e of Unesco that the Secretariat of the IHD is preparing a similar review but with a larger bearing on all water-resources agencies.
The Commission realized the difficulties involved ,in preparing a report of this kind and conaid.ered, at this stage, that no further inquiries were necessary for updating this report. Nevertheless, it recommended in Recommendation 2 (CRy-III) that all the Members be invited, once again, to check the information about the organization and names and addresses of Hydrological and Hydrometeorological Services in their res pective countries appearing in the report, and to submit corrections, if any, by 1 Janu ary 1969 at the latest. The Commission also reoommended that the adapted dooument be oiTCulated for general purposes to Members and other interested parties, in the form of an appropriate publioation.
The Commission expressed the view that the Secretary-General should explore means for extending and making available further information on published and unpub lished data on the number and density of active stations dealing with tte several kinds of hydrometeorological elements.
Some members of the Commission felt that there was a need for additional stress to be plaoed on co-operation and co-ordination on a national basis between the ac tivi ties of servioes responsible for me teorology, hydrolcgJT and water resouroes. . The Commission recommended to the Executive Committee that action should be taken acoording to Recommendation 3 (CRy-III).
The Commission noted in this connexion that an effective way to foster this co-ordination was the participation of specialists of these services in joint technical meetings organized by WMO, including its Regional Associations, by tt.e IBD, and also by lASH, particularly in the field of scientific hydrology. Suoh joint participation, if strengthened in the future, might oontribute to the aim expressed in Recommendation 3 (CRy-III).
6. WORLD WATER BALANCE AND REPRESENTATIVE AND EXPERIMENTAL BASINS (Agenda item 6)
6.1 World Water Balance (Agenda item 6.1)
The Commi esion no ted that, at the invi ta t.ion of the lHD Co-ordina ting Counoil, WMO has provided the technical secretariat on several r-roblems conoerned wi th the metho dology of computation of hydrometeo~logioal elements of the World Water Balanoe. It noted in particular that these problems were concerned with recommended methods. of esti- GENERAL SUIOURY 11 mati on of precipitation over a given area and of evaporAtion estimation, with the pre oipitation and evaporation part of the hydrologioal oyole over the ooean, and with 00- ordinated mapa of preoipitation and ev&poratlon and runoffe
The Commi ••ion oonaids-red this aotivi ty of DO &B an i.portant oontribution to the IBD aotivities on Vorld Vater Balanoe, whioh vas also stresaed by the representa tive of the lED Seoretariat in Unesoo.
The Commission oonourred with the opinion of the IBD Working Group on World Water Balanoe that, at the invitation of the lED Co-ordinati~ Counoil, ¥MO should as sist thi. working group in_:prepa.ring reoommendations for the development of methodology for Vorld Vater B~lanoe oomputation••
The Commission expressed its agreement that WMO oontinue theae aotivities in tegrated in the ¥MO/IED projeot entitled "Methodology of oOllputation of hydro... teorolo "ioal element. for World Water Balanoe", as indioated in Reoommendation 4 (Clly-III).
The Co ••i •• ion reoommendedfUrther that in impleme~tation of thi. projeot all available maierial prepared and published by lIMO be ufted, in partioular the liMO Teohni oal Not. Bo. 83, IIMeallurement of evapora.tion and evapotranspiration".
It alao expressed the wish that the Exeoutive Committee Panel of Experts on IHD ~viev this projeot periodioally and reoommend ways for its implementatione
The Commie.ion also noted with appreoi&tion the report on aotivities of the eCl Working Group on Climatic Atl&8eB, submitted by the CRy repreaentative on thia lI'ork ing groUP8 It expressed its gratitude to the rapporteur for the exoellent report and requested him to oontinue his partioip&tion in this working group as representative of cay and to aubmit a report to the next se.Bion of the Commi8siQn.
In oonnexion with thi. report, the Commission took note of the invitation of the IBn Co-ordinating Counoil to WMO to prepare, in oo-oper&tion with Unesoo, world _ap. of precipitation and evaporation,And expreBsed its opinion on this invitation in Reoommendation 4 (OBY-III).
6.2 Representative and experimental basins (Agenda item 6.2)
The Commission took oognizanoe of the report of the Working Group on Repre sentative and Experimental Basins and noted with satiefaction the exoellent co-ordina tion obtaining between the activities of the group and those of the Working Group of the Co-ordinating Counoil of the International Hydrologioal Deoade in the same oonnexion. The working group was oongratulated on the York performed in the somewhat r84trioted span of its aotivity.
The chairman of the working group advised the Commission that a third preli minary study of the reoession curve of the snowmelt hydrograph had been drawn up sinoe th-e drafting of the above report. This study had served to show exaotly how far the york of the group had advanced.
He also informed the Commission of the diffioulties enoountered in defining typical storms and made various suggestions whereby a solution oould be found.
The Commission, noting that the te~. of referenoe of the grou~ had been drawn up too late for its task to be performed in full and reoognizing the need to pro oeed with the drawing up of guidelines for whioh provision had been made, deoided to 12 GElIIERAL SUMMARY
re-appoint the Working Group on Representative and Experimental Basins. Its conclu- sians in this matter will be found in Resolution 7 (CIIy-III).
In compliance with the request of the chairman of the working group, the Com mission also decided to broaden the representation of Member countries in the group.
7. HYDROLOGICAL FORECASTING (Agenda item 7) 7.1 Working Group on Hydrological Forecasting (Agenda item 7.1)
The Commission noted with appreciation the report on the working groupls aotivities, presented by the chairman of the group, and the report on the meeting of the group, presented by the Seoretary-General.
Tne session noted the opinion of the group as regards the content of the existing Annex B of the Guide and expressed its appreciation for the editorial changes and the inclusion of new information in this important section of the Guide.
It was noted that the working group had been unable to complete the drafting of the Technical Note on Hydrological Foreoasting before the session. As it was oon sidered that this Note would be a most important oontribution to knowledge on this sub jeot, and in view of the fact that the IHD Co-ordinating Counoil had requested that WMO should ciroulate a review of ourrent knowledge to national committees, the Commission decided that aotion shOUld be taken to ensure that this Note is completed.
In addition to the above pOint, it was further noted that the Co-ordinating Council of the lED had requested HMO to oontinue its efforts in those areas of hydrolo gical foreoasting for which the Organization had accepted responsibility.
For these reasons, the Commission decided to re-establish its Working Group on Hydrological Forecasting with terms of reference as set out in Resolution 8 (CHy-III).
7.2 Australian symposium and related m~o activities in hydrological forecasting (Agenda item 7.2)
The Commission noted with interest the report of WMO conSUltants and recom mendations regarding areas requiriRg research which were defined by the Symposium on Hydrological Foreo_asting held in Australia and agreed that efforts should be made to encourage work in these areas. It also noted that the Co-ordinating Counoil of the IBD ~,-ad at its fourth .meeting adopted the following topics as being sui table for definition as IHD projects:
(a) The application of recent research Tesul ts in IImicro-hydrologyll to the pro blems of foreoasting catchment behaviour;
The application of conceptual models using oomputers in hydrological for9- oasting;
(0 ) The study of snow cover assessment by satellite.
The Commission recognized that much of the research needed in these areas would need to be undertaken at the national level ani urged Members to note the import ance attaohed to these subjeots by both the Commission and the Counoil of the IHDe GENERAL SUMMARY 13
However, it also believed that there would be sufficient information avail~ able at the present time to warrant the immedia.te start of work on behalf of the Commis sion. In the case of the first two of these subjects it was deoided to reoommend that "consultants be appointed for this task, and that the results of these investigations' could be produced as vol~s in the WMO/IHD projeot series. These decisions by the Commission are incorporated in Recommendation 5 (CRy-III).
In regard to the third item it was noted with satisfaction that-this project nas already been favourabiy considered by the Executive Committee and it has been· in 'eluded ~n the general planning of the World Weather Watch.
The Commission requested that its Working Group on Hydrometeorological A8pec~ of the World Weather Watch keep in touoh with developments in this projeot and report on it to' the next session of the Commission.
'A further topic was identified by the Australian symposium as requlrlng urgent attention. This is related to the benefit-cost assessment of hydrological forecasting systems. The Co-ordinating Council of the IHD deoided that this topic was outsi'de the soope of its programme. However, the Commission agreed that it was a question whioh warranted attention by' its working group.
7·3 Wind Set-Up and Seiches (Agenda item 7.3) The Commission was privileged to have. a personal report from Pro fessor,L. J5 Tison on the baokground and purposes of the draft Technioal ~qte on Wind Set-Up and Seiohes which he and Professor G. Tison, Jr. had prepared in accordanoe with the decisions made during the second session of the Commission (CHy-II, General Summary, paragraph 8.6). It had been painted out that the bibliography which had been Rssembled to be part of the proposed Teohnical Note did not oontain many referenoes after 1955. Several delegates attributed ·this to a real laok of new work on seiohes or on other a~peots of lake dynamics. The hope was expressed that ne~ research in this iroporta~t field. could be encouraged.
Warm thanks were extended to Professor L. J. Tison and his son for their v~luabl~ oontribution. The Commission then expressed full support to its presiden"i;-' in reoommending to the Secretar,y-Oeneral that the report be published in full in the WMO Technioal Note series after the addition to the bibliography of any recent" work whioh may be bro~ht to the attention of the Seoretariat.
7.4 Meteorological forecasts for aydrological purposes (Agenda item 7.4)
The Commission examined with a great deal of interest and expressed its ap preoiation for the report submitted by Mr. P. I. Miljukov, CSM Rapporteur on Meteorolo gioal Foreoasts of Importance to Hydrological Forecasting. It was noted that the report is a first draft, drawn up in complianoe with Resolution 5 (CSM-IV), and will be suppie men ted and expanded in the future, taking into account comments and suggestions received after review. The Commission expressed the view that it would be useful if CSM would assemble a small group to study further the question of the availability and acouraoy of long-range meteorological forecasts as an aid in hydrological forecasting. The "Commis sion then expressed its view that publication of the final expanded version of the report, as planned by CSM, would be of great value to hydrologists as well as meteoro logists. 14 GENERAL SUMMARY
Avalanohe warnings (Agenda item 7.5)
The Commission noted with oonoern that inoreased usa of Bupersonio aircraft will increase avalanohe ocourrenoe. Triggering of avalanohes by shook w&ves from super sonic planes has been observed i but no systematio observations of such events bas been undertaken on an international Boale.
The Commission reoognized that a co-ordinated international programme of ob servation of avalanohes triggered by supersonic waves and their relationship to meteoro logical elements and snow faotors will require a uniform system of observation and cod~ of reporting. The Instruotions for Observers (Avalanohe Servioe) prepared by the Swiss Institute for the Study of Snow and Avalanohes provide such a system.
The Commission commended the Swiss Institute for its work and recommended that the various countries of the Alps oonsider adopting this field-manual for taking observations in connexion with avalanohes, noting particularly those aval&nches triggered by supersonic waves. This could lead to eventual development of an international system for warning of avalanche hazards associated with supersonic airoraft.
The Commission noted that the lASH Commission for Snow and Ice is also eon~ eerned with this problem of avalanches triggered by supersonic waves and has urged fur ther research in this field. The Secretary-General was requested, in oonsultation with the presidents of CHy, CIMO and CSM, to keep in touch with lASH and, as new research results on this. problem beoome available, to bring them to the attention of WMQ Members.
8. METEOROLOGICAL AND HYDROLOGICAL DATA FOR THE DESIGN OF WATER RESOURCES PRO uTEeTS (Agenda item 8)
8.1 Estimation of maximum floods (Agenda item 8.1)
In the absenoe of the ohairman, the Commission was presented with the report of the Working Group on Estimation of Maximum Floods by one of its members. The Com mission noted that the working group has prepared a Technical Note on Estimation of Marl mum Floods, and that this Teohnioal Note is nov in the Seoretariat. The Commiesion re commended to the Seoretary-Oeneral that this Technioal Note be published as early as possible.
The Commission also discussed the op~n10n of the working group that no ohanges on the material inoluded in the Guide of Estimation of Maximum Floods were ur gently required, but that the Worki~ Group on the Guide should review the above-men tioned Teohnical Note when it is published, with a view to including Bome of its parts into the Guide.
The Commission ooncurred with this 0p1n~on and recommended particularly that parts of Chapter 6 of the Technical Note, statistios of extremes, be inoluded in later revisions of the Guide.
The Commission further noted that a number of international bodies - in partioular, a working group of the IHD Co-ordinating Counoil and the International Com mission On Large Dame - are ooncerned with acourate methods of estimating extreme flood events.
The Commission considered it vital that close co-operation be maintained between those bodies and WMO in view of the important role of hydrology in the study of this problem. GENERAL SUMMARY 15
The Commission oongratulated the w~rking group on the exoellent aocompliahment of its tasks and, to avoid duplioation of efforts, deoided not to re-establish ~ working group on this subject. Nevertheless, in order to keep the members of C~v informed of international developments in this field, and to represent the views of WMO in pertinent international disoussions, it deoided, in Resolution 9 (CRy-III), to appoint a Rappor teur on Estimation of Maximum Floods with the tasks specified in this resolution.
Some members of the Commission pOinted out that adequate information should be supplied to all bodies ooncerned wi th this question on the work done by the Commis sion. It therefore reoommended that the Seoretary-General study the means of es-tablish ing oontaots with these bodies and of bringing this work to their attention. This ap plies partioularly to the International Commission on Large Dams. Since the IHD Co ordinating Counoil and its Working Group on Floods had specifically requested the parti
Cipation of WMO in their work t the Commission reoommended to the Secretar,Y-General that t whenever possible, the CHY rapporteur be one of the WMO representatives at these meeti~.
The Commission_recommended that the rapporteur york in close oollaboration with the CHy Working Group on Hydrologioal-Design Data for Water Resources Projects.
8.2 Technical Note on Depth-Area-Duration of Rainfall (Agenda item 8.2)
The Commission was informed by the president and the Secretar,y-General that the Manual on Depth-Araa-Duration Analysis, the preparation of whioh was reoommended by the Commission at its seoond session, has now been completed and is in the prooess of publioa tion.
The Oommission expressed its satisfaotion with the action taken and congrat~ lated the authors of the Manual for their excellent work.
The Commission considered it important that this Manual should be published as soon as possible and should reoeive the widest possible oiroulation. For this pur pose, it reoommended that the Secretary-General study the possibilities of its transla tion into the other offioial languages of the.- Organization.
The Commission also considered it important that appendices to the Manual, covering frequenoy analysis of storm rainfall, should be prepared by oonsultants at a later stage.
The Commission reoommended that the Manual be published in the ¥MO Technical Note series. Additional action should be taken for this Manual to reaoh all national oommittees of the International H~rologioal Deoade. This problem, however, was oonsi dered as a general problem under agenda item 11.1.
8.3 H.ydrologioal design data for water resouroes projects (Agenda item 8.3)
The Commission was presented with information in a dooument by the Seoreta~ General on the IHD aotivities dealing with the availability of data for the planning and design of water resouroes projeots. The document also submitted for disoussion some proposals for ¥MO contributions to these very important activities.
There was considerable disoussion on the aotivities of the Commission whioh might be useful and on the relationship between this york and that desoribed in the re levant IHD Co-ordinating Council resolutions. The Commission was advised by a represen tative of Unesoo that a small group of experts would meet in Ootober 1968, at which time deCisions would be taken on the soope of the efforts required under this resolution. 16 GENERAL SUMMARY
Several views were expressed, urging the IHD to take advantage of the work and competenoe of the Commission. This action would seem espeoially appropriate as rega.rds se.veral parts of the WMO Guide to Hydrometeorologioal Praotices and york on estimation of maximum floods and depth-area-duration analyaea of storm rainfall~
In Resolution 10 (CRy-III), the Commission deoided to establish a working group to carry out these important aotivities. It was also deoided that a member of this working group should be ~ssigned the responsibilit,y of keeping the working group informed of the work of the lliD in this field.
1Yphoon damage oontrol projeot (Agenda item 8.4)
The Commission heard with great interest a report on a Special Fund project "Pilot Project for Improvement and Expansion of Typhoon and Flood Warning Servioes in Taiwan" and on other later surveys and projeots to improve typhoon- and flood-warning services. It noted with appreoiation the efforts to improve and inorease faoili ties and knowledge in the hydrologioal as well as the meteorologioal aspeots of suoh essentially needed servioes to reduoe human Buffering, loss of life and damage to prope~ty.
8.5 Storm dietribution for short durations (Agenda item 8.5)
The Commission heard a report by the Delegate of India on the problems -of estimating maximum flood disoharge involving storms of short duration (less than 24 hours). This problem is most diffioult in oountries with few or no reoording raingaugoo from whioh reooras of variability of rainfall with time oan be Obtained. There is a need to standardize the prooedures and methods of working out short-duration storm rain fall from depth-area-duration values over one or two days, partioularly when the requi site reoording raingauge data. are not available.
During the disoussion of this problem, referenoe was made to the preparation of a man~l on depth-area-duration analysis (see agenda item 8.2) and the proposal to publish it in the Technical Note series. In view of the imminent availability of this manual, the Commission agreed that no further aotion was needed on this item at this time.
HYDRtlLOGICAL ASPECTS OF THE WORLD WATHER WATCH (Agenda item 9)
Hydrological aepects of the World Weather Watoh (Agenda item 9.1)
The Commission noted with approval the aotion of its president, in aooordance with the authorization of the Executive Committee, in establishing a Working Group on Hydrometeorologioal Aspeots of the World Weather Watoh. It expressed its appreoiation of the report of the working group. It also heard a brief desoription from a represent ative of the Secretary-General of the WWW plan for 1968-1971 and on the steps now being taken for its implementation and further planning. The hope was expressed that the WWW would be of praotioal value to hydrologists.
The Commission was informed that the draft report on "Hydrologic Requirements for Weather Radar Data", prepared by Mr. A. F. Flanders, had been studied by the yo~king group and the EC Panel of Experts for IHD, but had not yet been aooepted for reproduc tion. It was agreed that such a report would be useful and that an early deoision on pUblioation is desirable. GENERAL SUMMARY 17
It was agreed that developments under the WWW should be kept under review as they apply to hydrological servioes and that a seleoted group of experts should be re quested to make reoommendations on ways in whioh WWW might be developed so as to be of greatest value and benefit to hydrological services and researoh. Resolution 11 (CHy-II~ was adopted to establish a Working Group on Hydrologioal Aspeots of the World Weather Watoh.
9.2 Maohine prooessing of ~ydrometeorological data (Agenda item 9.2)
The Commission reoeived with great interest a report by the chairman of the Working Group on Maohine Prooessing of Hydrometeorologioal Data. He pointed out that, while a great deal of work had already been done, it had not been possible to oomplete the Technioal Note as planned. Some diffioulty had been experienoed in interpreting and fulfilling one of the terms of reference whioh requested material "for application in oountries at various stages of development". He also said that many new ideas had oome to the group's attention as a result of the Asheville Symposium on Data-Processing for Climatologioal Purposes (May 1968), and that additional assimilation time was re quired.
Several delegates spoke in appreoiation of the good progress whioh the work ing group had made in its difficult tasks and supported the view that a new working group should be established to oomplete the Teohnical Note. The Commission for Clima tology (eCI) had been represented on the previous working group and it was agreed that this representation should oontinue if a new group were established.
In oonsidering the terms of referenoe of a new group, it was suggested that the t&sks should be defined in two phases, the first to oonsiat of the completing of the draft Teohnical Note which was already well under way, and the seoond to oonsider the newer and rapidly developing systems and programmes of the WMO and the IHD, such as the World Weather Watoh, the World Water Balanoe, and SAPHYDATA (IHD Panel of Experts on Systems for Aoquisition, Transmission and Prooessing of Hydrological Data).
It was agreed that a Working Group on Maohine Processing of Hydroi1leteorolo gioal Data should be established and draft Resolution 12 (CHy-III) was adopted for this purpose.
9.3 Water information systems and related IHD projects (Agenda item 9.3)
The Commission was informed, in a report by the Secretar,y-Oeneral, of activi ties of the IHD Co-ordinating Counoil in the field of water information sYBtems~ A WMO/ IHD Projeot on Water Information Systems has been established. This projeot oonsists mainly of adapting dooumentation on the hydrologioal aspects of the World Weather Watch for the purposes of IHD.
The Unesoo representative reviewed the aotivities of the IHD Panel on SAPHY DATA, whioh has prepared a report on water information systems.
The Commission wished to reoord its very great interest in the development of water information systems, espeoially their oontributions to operational aspects of hy drolOgical forecasting, and weloomed the aotion which had been taken by WMO to contri bute to the SAPHYDATA teohnioal paper.
It was noted that the discussions and oonclusions under agenda items 9.1 and 9.2, inoluding the establishment of two working groups, are olosely related to this item. The Commission agreed that its decisions on these items are sufficient at the moment. 18 GENERAL SUMMARY
10. EDUCATION AND TRAINING (Agenda item 10)
10.1 Guidance material and re~ort on training of hydrometeorological pe~Ronnel (Agenda item 10.1)
The Commission examined the report of the Working Group on Training in Hydrometeorology and the Report on Training of Eydrometeorologioal Personnel, and con gratulated the working gr.oup on the ex
The Working Group on Education of the CO-9rdinating Council for the IHD has also taken cognizanoe of this publication and has decided to use it when necessary, par tioularly to include it in the casebook on syllabi for training of hydrologists whioh the working group is preparing. In fact the appendices of this report oontain syllabi for hydrometeorological personnel of Classes I, II and III. The Commission has etres.e~ once again the importance of the problem of education and professional training in hydzo logy and considered it ver,y important that hydrometeorology be inoluded in training pro grammes for meteorologists. Particular attention was drawn to the fact that this sub ject should be introduced in the appropriate form into the WMO training oentres' pro grammes as recommended by the Commission at its second session. The Commission recom mended that more effective steps be taken in this direction at the earliest possible opportuni ty.
In order to promote these activities witLin the framework of WMO, the Commie sion has appointed a rapporteur with terms of referenoe listed in Resolution 13 (CHy-III~
The Commission invited the rapporteur to carry out his tasks in olose co operation with the Executive Committee Panel of Experts on Meteorological Education. It recommended that this panel examine in detail the pOBsibili~ of increased inclusion ~t hydrology. and hydrometeorology in the eduoation and training of meteorologists. For thi1iJ purpose the Executive Committee might consider the possibility of including one or two additional speCialists in hydrometeorology in the above panel.
10.2 Co-o eration with the Co-ordinatin Council for lED in drolo ioal eduoation and training Agenda item 10.2
The Commission eIamined a dooument presented by tLe Secretary-General on the activities of the IHD Co-ordinating Council and Unesco, in the field of education in hy drology •
The representative of Unesco has also informed the Commission about these a~ tivities and has drawn its attention partioularly to the lHD Working Group on Education, which has recommended a long-term plan for hydrological education and is oontinually.in volved in its implementation. This working group is being assisted in its work by the panel of directors of Unesco-sponsored }:,ostgraduate courses in hydrology.
The IHD Co-crdinating Council has invited WMO to send several representatives to its Working Group on Education in Hydrology and also to the above-mentioned panel.
In considering these activities the Commission decided, in order to avoid any duplication of effort in this field, not to re-establish its Working Group on Training in-Hydromet.~orology, but to recommend that iNO be represented in the bodies creat~d within the lED and Unesco by several Members., one of whom should be, whenever possible, the Rapporteur on Training in Hydrology apPOinted in Resolution 13 (CHy-III). GENERAL SUMMARY 19
The Commission considers this the best way to implement the decisions of Fifth Congress, expressed in Resolution 27 (Cg-V).
10.3 Training seminars (Agenda item 10.3)
The Commission was infomed" by a document of the Secretary-Gene;ral, on training seminars organized between its seoond and third sessions in different branohes of hydrology for the benefit of participants from developing countries. The following seminars were organized by WMO in co-operation with other international organizations: ; (a) Seminar on Methods of Hydrologioal Forecasting for the Utilization of Water Resources; in co-operation with ECAFE, Bangkok, 1964;
(b) Seminar on the Assessment of the Magnitude and Frequenoy of Flood Flowe, in co-operation with ECAFE, Bangkok, 1966;
(c) Seminar on Hydrometeorological Instruments and Methods of Observation and on Establishment of Eydrometeorological Networks; under WMO participation in the UNDP, Campinae, ~razil, 1966;
Seminar on Hydrometeorologioal Instruments and Methods of Observation and Networks} in co-operation with the UN Eoonomio Commission for Africa, Addis Ababa, 1967.
In the two latter seminars, Unesco co-operated by sponsoring leoturers.
The representative of Unesco expressed the appreciation of his organization and the IBD Co-ordinating Council for this useful work of WMO, and the readiness of his organization to co-operate again in the future in seminars organized by WMO. He informed the Commission of a similar course organized by Unesco in Tunisia and appreciated WMOIS oo-operation in this course by sponsoring one lecturer. He indioated that Unesco would also weloome suoh WMO co-operation in future oourses it would organize.
The Commission considered that such seminars were very useful and constituted one of the best means of helping the developing countries in raising the level of per sonnel working in the field of hydrology-.
The Commission invited the Secretary-General to study possibilities for the organization of suoh seminars again in the future, particularly within WMO participation in the UNDP. It noted that seminars were to be organized in October 1968, in Eratislava, Czechoslovakia, on methods of hydrological forecasting; and in November 1968., in Kuala Lumpur, Malaysia, on forecasting of heavy rains and resulting floods.
The Commission finally expressed its satisfaotion with the good oo-operation between WMO and other international agencies in the organization of these seminars, partioularly with the UN regional economic oommissions and Unesoo, and suggested that such oo-o~eration be maintained in the future.
11. PlJJ3LICATIONS, TERMINOLOGY, UNIVERSAL DECIMAL C!,.ASSIFICATION IN HYDROLOGY (Agenda item 11) 11.1 WMO/IHD reports and other publications (Agenda item 11.1) The Commission considered a document, by the Secretamy-General, informing it of WMO publications issued in its field of interest since the second session of the 20 GENERAL SUMMARY
Commission. The list of these publications is given in Annex III to the present report. They consist of four types of pUblioation. (a) Guides, (b) Technioal Notes, (c) 1iMO!IHD re po rts, and (d) miscellaneous.
Some members of the Commission expressed the view, partioularly in oonnexion with the publication of the Manual on Depth-Area-Duration Analysis (see agenda item 8.2), that maybe a new series of manuals should be published by WMO. The Commission disoussed the proposals at consider.able length &l}d came to the oonclusion that it would not be appropriate at this moment to start a new series of publioations. In faot, the oharao ter of a manual oan be indicated in the title of such a publication.
The Commission has noted that the new series of publications, the WMO/IHD re ports, has gained considerable interest in many Members oountries and in diverse profes sional oircles. Many more oopies of these reports have been requested by different au thori ties.
The representative of the Seoretary-General drew the attention of the Commis sion to the faot that, to date, this series is being distributed free of oharge, whioh limits the number of copies available. On the other hand, free distribution contributes to a wide oirculation of these publications. Thus, a oonflioting inte~Bt arises. In order to reoonoile both points of view, the Commission, in Reoommendation 6 (CEy-TII), recommended that the WMO/IHD reports be issued as a publioation On sale, in the same manner as Technical Notes, but that a limited number of copies be distributed free of charge, partioularly to the national oommittees for IHD, and thus bring these publica tions to the attention of the widest cirole of hydrologists. In addition, the Commis sion suggested that the Seoretar,y-General should consider means of publioizing, in hy drologioal professional circles, all publioations of WMO of interest to them.
The Commission further reoommended, although fully oognizant of the fact that the size and layout of publioations are at the discretion of the Seoretary-General, that the WMO/raTI reports, and possibly Teohnioal Notes having a oharaoter of manuals, be pub lished in a more oonvenient smaller size, such as, for example, that of the first five 1iMO!IHD reports.
The Commission noted that the work of its different working groups produces a number of reports, several of whioh merit publioation in a formal manner, rather ~han circUlation as mimeographed doouments.. It expressed the opinion that the reoo"mmendation to the Seoretary-General of such formal publications should be at the disoretion of the president.
The Commission finally expressed the regret that the publioation of Russian and French versions of the Guide to HYdrometeorologioal Praotioes was oonsiderably delayed and requested the Secretary-General to take the necessar,y steps fIDr an early publication of these versions.
11.2 WMO!Unesco Joint Project on TerminologY in KydrologY (Agenda item 11.2)
The Commission oonsidered the report by the chairman of the Working Group on Terminology and noted that the collaboration with Unesco had been largely extended by the formation of a Joint WMO/Unesco Panel on Terminology in HYdrology. The representa tive of Unesco expressed the great interest of his organization and of the IHD Co-ordi nating Council in the completion of this extremely valuable project and stated that Unesco was ready to continue its co-operation with WMO in the above-mentioned joint panel. GENERAL SUMMARY 21
The Commission noted with great satisfaotion t~e appreoiable progress made in the period between its seoond and third sessions by the publication of the first draft copy of the Multilingual Glossary in Hydrology, containing 1,065 terms with equi valents in the four offioial languages of WMO and with provisional definitions in English. The 80le purpose of this list of provisional definitjons was to be an aid in ohecking the equivalents.
It wag noted that the firEt draft copy of the Glossary had been oirculated to tl:e national oommi tteee 0f IHD and that comments had been invited. The Secretary-Genera-l is requested to oirculate a copy to the permanent representatives and to invite comments at an early date.
As it appears that there exists an urgent need for fublication of a multilin sual list of hydrological terms and as the list of equivalents can be considered to be ::n f'~ muoh more finalized fom than the list of defini tiona, it was recommended that the list of equivalents be published at an early date, after certain corrections have been made, and that it be given a wide circulation. The edi ting of this publication will be done at the WMO Seoretaria i; wi th the help of WMO and Unesco consul tants, in compliance with Reoommendation : (CHy-IlI) , paragraph (1), and in consultation with th~ WMO/Unesco panel. It was recommenced ~hat limi ted distribution be made of the list of defini.tions in mimeographed form as an aid to oorrecting equivalents.
In printing the list of equivalents, provision might be mad.e for a blank space next to each set of equivalents, to provide the possibility for ind.ividual coun tries to add equivalents in their respective languages.
It was thought desirable that the Secretary-Ceneral arrange, if possible, for the apPointment of two conSUltants of WMO, for up to two months per year each, in order to review the comments received from the different commi ttees and individuals and to issue new draft editions of tte Glossary when appropriate. The WMO consultants might co-operate with conSUltants to be nominated by Unesco, so that they would cover all the languages of the Glossary.
The Commission endorsed the ultimate target o~ the Joint WMO/Unesco Glossary on Te~inology, which will be a publication Bimilar to the International Meteorological Vocabulary, with the following additions I
(a) Definitions will be given in all four languages; (b) The Universal Decimal Classification numbers for hydrology, if available, will he given in all four languages; (0) A list of referenoe Ii tera ture and of reoommended symbols in hydrology will be added.
The need was expressed for oloBe contact to be maintained with the work on Universal r·ecimal Classification at present being performed. under the auspioes of the Organi za tion.
It was thought desirable for a certain number of statistical terms which are in common use in hydrology to be included in the Glossary. Some delegates consid.ered the. possi"biU ty of transla.ting the Glossary into additional languages. The Commission recommended that. the Secretary-General clarify tlds possibility with interested instit~ tions. 22 GENERU SUMMARY
The Commission expressed great appreciation to the working group for ite ex cellent work and appreciated partioularly the activity of its chairman, who had devoted so muoh effort to bring the task of the working group to suocess. Noting that the work is well under way but that at this stage the preparation of the Glossar.v will be best implemented by a joint panel of the WldO/Unesco Secreta.riats wi th the help of oonsul tants, the Commj,ssion did not consider it neoessary to re-establish the Working Group on Ter minology. In order to provide assistance to the WMO Seoretariat and to be kept informed on the developments in this field, it appointed a Rapporteur on Terminology in Hydrology with responsibilities specified in Resolution 14 (CRy-III).
11.3 Universal Decimal Classification in hydrology (Agenda item 11.3)
The Commission was presented the report of the CRy Working Group on Universal Decimal Classification by the chairman of the working group.
The Commission congratulated the working group, and particularly its chairman, for the untiring interest and pursuance of the work which has been brought to a succes& ful conclusion. It noted that the first t.ask of the group, to prepare a detailed smhe dule of hydrology within the unc, was completed. This schedule was publiBh~d in ex ten tiona and corrections to the unc in September 1968 and is, therefore t officially adopted. The seoond task, the provision of a unique basic number, was also accomplished and this number (556) was agreed upon at Wiesbaden in October 1967& The third task, which con sidered the publication of a special ~1O/UDC edition for meteorology and hydrology, is well on the way towards completion.
The Commission agreed that there are several remaining problems whioh have to be solved in order to produce a publishable Guide to unc in hydrology and also in oon nexion with the work on the Multilingual Glossary in Hydrology prepared jointly by WMO and Unesco.
It deoided, therefore, in Resolution 15 (CRy-III), to appoint a Rapporteur on Universal"Decimal Classification in Hydrology with the responsibilities specified in thw resolution.
12. TECHNICAL ASSISTANCE AND RELATED PROJECTS (Agenda item 12)
12.1 Technical assistanoe (Agenda item 12.1)
The Commission noted with satisfaction a report by the Secretary-General on various projeots undertaken by WMO in the field of hydrometeorology under the United Natione Development Programme.
Considering the growing importanoe which governments of developing oountries attach to the rational development of their water resources, espeoially in the integrated management of river basins, the Commission reoommends the Secretar,y-Oeneral to invite the governments of the countries conoerned to take all requisite action to provide per sonnel and eqUipment in keeping with the requirements due to their hydrometeorological" problems.
The Commission considered it useful that further information concerning tech nical assistance provided by WMO in the field of hydrometeorology be included in Annex IV to this report. GENERAL SUMMARY 23
12.2 Water resouroes consultants team (Agenda item 12.2)
The president of the Commission stated that, over the years, he had fre quently been called upon to reoommend experts for various types of assignments of inte rest to the Commission. Some assignments involved work Itat home", e1 ther in preparing reports or reviews, or in representing the Organization at nearby meetings. Other as signments involved travel with short or long absenoes from home. The kind of specia lity of the expert also varied across the broad speotrum of hydrometeorology. He asked the Commission to oonsider how it might best assist the next president in this problem by keeping him advised of the availability of various kinds of expert for various kinds of task. The subsequent discussion indioated that such information would also be use ful in the Secretarjat in connexion with technioal assistanoe projects.
Several delegates pointed out the practical diffioulties in assembling a list of experts frOID governmental or other agencies who could be considered "available" or who would wish to be so listed. The consensus was that the problem should be oonsidered further by members of the Commission and that the new president oould attempt to work out a trial method of preparing suoh a list with the oo-operation of the Seoretariat. In addi tion, the Commission agreed that the Advisory Working Group established by Reso lution 17 (CHy-III) be asked to assist the president in this respect.
13. HYDROLOGICAL ASPECTS OF ARTIFICIAL RAINFALL AND ASSESSMENT OF CONTINENTAL DROUGHT (Agenda item 13)
13.1 Artificial rainfall (Agenda item 13.1)
The Commission noted with appreoiation a report by the Secretar,y-General on activities of the WMO with regard to the artifioial stimUlation of rainfall. The Exe cutive Commj.ttee Pallel of Experts for the IHD had, at its fifth session, noted the neGse sity of an up-to-date review of research and investigations in this field and. had sug gested that a revised version of Technical Note No. 13 should inolude all relevant as pects of the problem, in partj8ular the hydrological and water resouroes aspects. The Commission welcomed the proposal that such a revision be prepared and urged that early action be taken in view of the widespread interest in the subject. It agreed that this revision would be best prepared by qualified consultants, one of them at least oovering the hydrologioal as:pec ts. It -should then be oonai dered by the president of CRy as it relates to the field of hydrology.
13.2 Continental drought (Agenda item 13.2)
The Commission was informed that the IHD Co-crdinating Council -had invited WMO to consider the problem of assessment and classifioation of oontinental drought. Copies of WMO/IHD Project Report No.2 on "Inoidenoe and Spread of Continental Drought" were distributed. The author, Dr. V. P. Subrahmanyam, was warmly oongratulated on his excellent oontribution.
Several delegates spoke on the importanoe of further study on the oauses of such major and widespread drought oonditions and means for foreoasting suoh events. The need for a bibliography of reoent work on the subjeot was emphasized. It was painted out that the Exeoutive Committee Panel of Experts had stressed the problem from two points of view: (1) the statistioal or historical; and (2) the phyl!lioal or forecast ing. The panel had recommended that CSM study the matter. 24 GENERAL SUMMARY
The Commission decided that a Rapporteur on Continental Drought should be apPointed to keep this important subjeot under ourrent review. Resolution 16 (CRy-III) 'Was adopted ..
14. CO-OPERATION WITH OTHER mTERNATIONAL ORGANIZATIONS AND SYMPOSIA (Agenda item 14)
14.1 Co-operation with the lED Seoretariat and other international organizations (Agenda item 14.1)
The Commission examined several doouments submitted by the president and the Secretary-General on oo-operation of WMO with other international organizations and, in particular, on WMO participation in the IHD programme and on collaboration with the THD Seoretariat and Unesco. In this oonnexioll, the Commission also oonsidered a report of the Exeoutive Committee Panel of Experts, on IHD aotivities whioh had been requested by the second session of the Commission for Hydrometeorology.
The secretary of the IHD Co-ordinating Council and representative of Unesco presented the Commission with an extensive review of IHD activities and of Unesco's pro gramme in hydrology in the past. He also acquainted the Commission with the future plans of IHD and, in particular, with the Unesco programme and budget for hydrology for 1969-1970, which inoludes on the one hand activities of IHD to be implemented by the IHD Secretariat in Unesco and, on the other, activities to be carried out by-the Unesco Se cretariat.
He indicated that full reports on these activities are contained in the re ports of the Co-ordinating Council of the IHD (Unesoo documents NS/198, NS/204, sc/es/ 75/64, SC/IHD/IV/36) and in the proposed programme and budget of Unesco for 1969-1970 (Doc. 15 C!5).
Although the Commission noted that most of the WMO/IHD projects and paints of common interest of WMO, the IHD prOgramme and Unesco were considered under agenda items technioally related to them, it considered it neoessary to expreSB its views on the prinoiples of WJvl0 co-operation in the IHD and to suggest effective ways of co-ordinating all IHD activities in relation to those of the Commission, as specifioally requested by Resolution 27 (Cg-V). The Commission also noted with appreoiation that the agenda of the session had been so prepared in a manner as to facilitate the disoussion of the Com ~iBBionfs aotivities during the next four years in the light of the IHD programme. In full cognizance of the IHD Co-ordinating Council decisions, whioh had been made avail able to the Commission through the Council's resolutions reproduced in the appendix to the president's report, the Commission noted that:
(a) The Commission, because of its broad i-ntergovernmental oomposi tion and teoh nical competence, is in a position to contribute to the suocess of the lHD;
The scope of the IHD programme is such as to include the field of oompetenoe of the Commission;
(0) WMO has responsibility for a number of projeots and aotivities in the lHD programme;
(d) The Co-ordinating Counoil is receptive to proposals submitted by WMO; (e) Appropriate aotivities of WMO may be aocepted as major contributions to the IHD; GENERAL SUMMARY 25
(f) Members of WMO (and Of other international organizations) are justifiably sensitive to possible duplioation.
The Commission realized that, in the light of the deoisions of the WMO Con gress and Executive Committee, WMO and CRy primary responsibilities within the IHD pro gramme should be oentered around the operational aspect of hydrology particularly in the following fields:
(a) Network design· and operation";
(b) Standardization of instruments and methods of observation in hydrology;
(c) Operational systems for acquisition, transmission and prooessing of data in hydrology (whioh are olosely related to the WMO World Weather Watoh pro gramme) ;
Meteorologioal and hydrologioal data for water resources projeots,
(e) Methods of oomputation of hydrometeorologioal elements for dete~ining. water balanoe;
(f) Hydrological forecasting;
(g) Assistance in the development of Meteorological and Hydrological Services;
(h) Preparation of guidanoe material for operational purposes in the above fields.
In addition to these fields, where CHy responsibilities appear of prime im portance with WMO oarrying an indivisible responsibility towards its Members, there are several other activities within the IHD programme which require direct WMO participation and collaboration. These are, for example, global water balance studies, terminology, organization of symposia and seminars, education and training in hydrology, eto.
Taking into consideration its terms of reference, the Commission noted that the WMO responsibilities are primarily oentred on preCipitation, evaporation and Burfaoe runoffJ on the other hand the above-mentioned operational activities of CRy wi thin- the IHD programme, conneoted with other elements of the oyole such as Boil moisture and groundwater, should be carried out in co-operation and, in some casss, under the leader ship of other international organizations such as Unesco, FAO and WHO; and advioe must also be sought from non-governmental organizations, primarily from lASH.
Besides expressing this basic opinion, the Commission oonsidered the institu tional problems of WMO partiCipation in the IHD programme. Guided by the above prin ciples, the president of CHy, its Advisory Working Group, the working groups and rap porteurs of CHy, and the WMO Seoretariat should carry out their activities taking full consideration of the IHD programme. Since the IHD projects for which WMO serves as technioal secretariat, as well as the development of IBD activities in conformity to the wishes of the annual meetings of the IHD Co-ordinating Council,necessitate oonstant re~ view and action on behalf of the WMO authoritative bodies, the Commission requests the Executive Committee Panel of Experts for IBD to keep the entire IHD programme in review, in order to recommend to the' president of CHy the best ways for CRy to partioipate in i~ and to advise the Secretary-General on ways to implement all the WMO/IHD projects.
The Commission also considered it extremely important that all WMO Members, and also the Co-ordinating Counoil of IHD, be fully cognizant of the attitude outlined 26 GENERAL SUMMARY above, In fact, since one of the conditions for successful accomplishment of these tasks in the olose co-operation and oo-ordination of aotivities of Meteorolqgical and Hydrological Services, well-circulated information to them is an important prerequisite.
The Commission oarefully examined its programme of activities 80 as to avoid any potential duplioation of effort, as is shown in several of its resolutions and re commendations, partiou~arly in the field of education, basic research on Worl_d "later Balanoe, floods, etc.
It expressed its conviction that the IHD Co-ordinating Council would approacih this problem in the same spirit and that the setting up of new groups and panels of ex perts within the IHD would be oarefully oonsidered, in order to avoid tbe duplioation of activities already well under way in CRy and WMO.
The Commission was most interested in an extensive report on FAO field work in hydrology and noted with appreciation the interest that this organization is expres sing ill the activities of CRy. It expressed. t~e wish that co-operation between WMO and FAD would be strengthened in the future. The Commission recommends that the Secretar,y General, in consul tation wi th the president of CRy, promote co-operation wi th all rele vant international governmental and non-governmental organizations ooncerned, in the field of hJ-drology and water resources, and take neoessary steps for keeping them in· formed of relevant activi ties of CRy and WMO. The Commission notes with appreciation that the presic.ent of CRy, in his periodical reports, informs the members of CRy of all developments conoerning co-operation with other international organizations. The Commis sion adopted Recommendation 8 (CRy-III).
The Commission oonsidered WMO responsi b1li ties in a. long-term programme of international co-operation in hydrology after the IHD (see agenda item 14.4).
14.2 Regional oo-operation (Agenda item 14.2)
The Commission considered a report on regional co-operation, submitted by the Secretar,y-General, giving information on the activities of working groupe on hydrometeo rology established within the WMO Regional Assooiations. Suoh working groups were esta blished in RA r(Afrioa), RA Jl (Asia), RA III (South America), RA VI (Europe).
Hydrometeorological matters to be considered in RA IV (North and Central America) were specifically delegated to the RA IV Working Group on Tropical Meteorology. RA V (SOi.lth-West Pacific), while cognizant of the importance of hydrometeoriblogioal questions, preferred to deal witt them on a national basis.
The chairmen of the regional working groups, particularly those of RA I and RA VI, have taken steps in order to establish a work programme which, in tte case of RA VI, went into considerable detail. Nevertheless, as it appears from the reports of the chairmen of at least one of these working groups, a very slight interest of the group members in the proposed work is observed.
The Commission conourred with the opinion that the most appropriate problems should be selected to be dealt with on a regional basis. Also a closer mutual relation ship between the groups shouid be aohieved, so that questions of methodology could be studied in various geographical oonditions. As no readily available information exists on the subJeots whioh could be treated in this way, the Commission suggested that its Advisory Group and the president of CRy oonsider this question and take appropriate ac tion. GENERAL SUMMARY 27
The representative of Unesco informed the Commission that both the IHD Co ordinating Council and, several Member States had stref;lsed the importance of due co operation between countries sharing common basins or situated in regions with similar hydrologioal conditions and problems. As a result Unesco is increasing its assistanoe to regional projects of this type and in particular will intensify the oonvening of re gional meetings of national committees for the IHD. The Unesco representative further stated that two regional hydrologists had been appointed to work in the Unesco Regional Soienoe Co-operation Offices in Asia and Latin America.
14.3 Symposia (Agenda item 14.3)
The Commission examined a document presented by the Secretary-General con taining a list of symposia of interest to the Commission,held during the period 1964- 1967. It further took note of a list of proposed future symposia planned for 1968-1974, mainly in the framework of the IHD (see Annex V to this report).
The Commission took the opportunity of expressing its appreciation to all the sponsors of the symposia within the field of interest of CRy and also to the Secret&r,y General of WMO for his contribution to the excellent results of these symposia.
The Commission considered these activi ties of great utility to all Member countries.
The delegate of the Federal Republio of Germany informed the Co~mission of the preparations for the Symposium on Hydrometry whioh is to be organized in Coblenz by Unesco, WMO, lASH and the Federal Republic of Germany in OotoberjNovember 1969.
The delegate a£ Canada informed the Commission that Canada is ready to host a Symposium on Snow and Ice Hydrology and Forecasting of Runoff Reaul ting from ~·t. 5lis symposium is to be held in Canada in 1972 and organized with the assistance qf Unesoo, ~10, IASH·and the Canadian national committee for IHD. The Symposium on World Water Balance to be organized in the United Kingdom in 1970 with the co-operation of ~nesco, WMO, lASH and the United Kingdom already held the attention of the Commission when the WMO oontributions to the methodology of oomputations for the World Water Balance were disQ.ussed.
The Commission endorsed WMO partiCipation in all the above symposia.
It was also agreed that the Executive Committee and the Secretary-General should consider possible WMO sponsorship of the Symposium on Distribution of Preoipita tion in Mountainous Areas.
14.4 IBD Mid-Deoade Conferenoe and needs and ossibilities for a Ion -term Ian of action in the field of hydrolOgy Agenda item 14.4
The Commission noted that the fourth session of the Co-ordinating Counoil of the International Hydrological Decade, held in Paris from 4 to 16 May 1968, recommended the oonvening of an international Conference on the Practical and Scientific Results of the IBD and on International Co-operation in Hydrology. This oonference is to be ~anvened by Unesoo, in co-operation with interested international organizations; the Direator-General of Unesco has made provision in the draft programme and budget of Unesco for 1969-1970 for this conference to be held from 6 to 11 October 1969 in Paris. 28 GENERAL SUMMARY
The- IHD COW1~il agreed that the conference should examine the following main poin ts: (a) A review of the work accomplished during the first half of the Decade; (b) The preparation of proposals for the future work of the Decade and for pos sible changes of direction of the programme; (c) Exchange of views on a long-term plan of action in the field of hydrology.
The WMO Executive Committee, at its twentieth session, expressed the view that lnr,[O should co-operate wi th Unesco in the organization of this conferenoe and author ized the Secretary-General to take apprcpriate steps to that effect. In view of the fact that a long-term plan of action in hydrology will be discussed at this oonference, the Exeoutive Committee requested the president of the Commission for Hydrometeorology to ensure that this question be considered at the third session of hiB Commission.
The Commission therefore considered the WMO contribution to the conferenoe and also the possible steps which WMO might take concerning a long-term plan of action in the field of hydrology after the end of the Decade. The Commission was presented with a document by its president and a document by the delegate of Guyana.
The Commission noted that it has been proposed that WMO, in its report to the conference, examine all 'WMO activities connected wi th the IHD programme a.."ld will, in particular, present a survey report on progress of the aotivities for whioh it serves, 'Or has served, as teohnioal secretariat. Among the most important of these activi ties are: network planning and design and hydrological foreoasting in the field of BUr face water. Particular emphasis will also be vested in the problems of hydrologioal as pects of the World Weather Watch.
The Commission expressed the view that, in addition to the above reports, the conferenoe should be presented with a report by WMO on methods of oomputation of hydro meteorological elements of water balanoe. The Commission requested the Secretary-General to take -the neoessary steps to prepare the above reports. The position of WMO in relation to, and possible WMO participation in, the second half of the Deoade was dis cussed by the Commission under agenda item 1401, where the decisions taken by the Com mission conoerning the prinoiples of this participation are recorded. The Commission finally considered at length the possibilities of a long-term plan of action in -the field of hydrology.
In this oonnexion the Commission considered the need_ for clarification and improved definition of the responsibilities of UN specialized agenoiee in the field of hydrology. The advent of the IHD has emphasized the present difficulties in relation to the diviSion of responsibilities among UN agenoies. The Commission suggests that the o~iginal rp.commendations of the Administrative Co-ordinating Committee of UN oonstitute a good basis for delineating responsibilities in the field of hydrology within the UN family, wi th a few minor exceptions which oould be reconciled before the termination of IHD. The ACC reoommendation defined the "measurement of hydrological elements" as "the l:'st.jng of element.s to he. measured, the development of international standards re lated to inst~~ment8 and methods of observation, the regulation for international ex change of data, the guidance on national teohnical publioations and the promotion, cre ation and development of national Services in the field". WMO should have primary res ponsibility for elements related to surface water, i.e. river stage and flow, lake level, lake and river ioe, glaciers, sediment transport, flow of springs, water temperature and wa ter quality. CHy has prod'J..ced guidance rna terial on these elements and, in a~di tion, has considered guidance material on other elements related to water balanoe StUd19S. GENERAL SUMMARY 29
Des-pi te these developments, there is still some doubt concerning the Organi zation's responsibilities in hydrology. The word "hydrometeorology" in the name of the Commission has tended, from the yiewpoint of hydrologists, to narrow the image of the Commission, and has caused confusion in the deliberations of the Commission.
The Commission agreed that considering WMOts experience and organization, it would be appropriate for it to assume responsibility for international co-operat~on in colleotion, transmission and publioation of data and for the operational aspeots invol ved in the land phase of the hydrologic'al cycle.
In view of these oonsiderations, the Commission recommends that the name of CHy be changed to "Commission for Hydrology" and that its terms of referenoe be changed to give a better idea of its responsibilities and to·minimize confusions over termino logy.
The new terms of reference of the Commission should reflect primary responsi- bili ty fOri
(1 ) The operational aspects of the oolleotion, transmission, processing a.nd publi oation of hydrological data related to the land phase of the hydrological oycle which includes the following elements:
(a) Precipitation; (b) Snow oover; (0) Water level of lakes and streams; (d) Streamflow and storage; (e) Evaporation and evapotranspirationJ (f) Soil moisture and groundwater; (g) Water temperature; (h) Sediment discharge; (i) River and lake ice; (j) Chemical quality of water. The referenoe to groundwater in 1 (f) above is conoerned only with that phase of groundwater which is related to surface water.
Research, development, improvement and promotion of methods, procedures -and techniques for:
(a) Design of networks for elements listed above; (b) Standardization of instruments and methods of observation; (c) Hydrologioal forecasting; Cd) Meteorological and hydrologioal data for the design of projects.
Rendering assistance to governments in the planning and organization of hy drological services, in the training of personnel for the oollection and ana lysis of hydrologioal data and the procurement of suitable equipment.
The Commission noted that, at present, the existing structure and national representation on the executive bodies of WMO does not provide for the adequate acknow ledgement of the views of national Hydrologioal Services. If, as is ~uggestedt WMO ac cepts the responsibility for the international co-operation on the operational aspeots of the land phase of the hydrological oycle, it may well be necessary to consider changes in the policy-making bodies of the Organization to represent more adequately the national Hydrological Services. Such changes are outside the oompetence of this 30 GENERAL SUMMARY
Commission, bu-t the Commission suggests that, if 'and when the Exeoutive Committee con siders this question, it may wish to use the adyioe of the president and the AdvisorY Working Group of CHy~
In order to ensure that the views of the national Services are taken into ao count in any deoisions affeoting their interests, it is oonsidered neoessary to oonvene an international intergovernmental meeting of experts from both Meteorological and Hy drologioal Servioes. This point has already been mentioned with reference to the Tech nical Regulations in Agenda item 4.1.
In oonnexion with the above-mentioned Mid-Deoade International Conferenoe on the Praotical and Soientifio Results of the IHD and on International Co-operation in Hydrology, the Commission was presented by the representative of Unesco with the sug gestion that the intergovernmental conferenoe of experts from Meteorol~.ioal and Hydro logical Servioes might be combined with the Mid-Decade IHD Conferenoe. Although, at first view, this proposal may present several advantages, the Commission, after careful consideration, did not oonsider it desirable. Since the Mid-Deoade Conferenoe is con vened by Unesco, whioh has a different membership from that of WMO, not all WMO Member oountries could be represented at this oonferenoe. In addition to this, the in tergovernmental meeting of experts of Hydrologioal and Meteor9logioal Services will be oalled upon to discuss several questions pertinen't only to WMO (e.g. Teohnioal Regula tions) and it must therefore. report directly to the executive organs of WMO. Finally, it is believed that the agenda of the Mid-Deoade Conferenoe has already been heavily loaded with items pertaining to the IHD and to general questions of international 00- operation in hydrology and, sinoe the preparations of the oonferenoe are well under way, a basio change of the content and purpose of the conferenoe seems. rather impraoticable.
However, the Commission believes that the opportunity offered by the rnid Decade meeting should be used to allow delegates to disouss the proposed role of IDIO in 4yUrology which has been outlined under this item of the agenda.
While the Commission strongly reoommends the holding of the intergovernment~ conferenoe of experts from Meteorologioal and Hydrological Servioes, it r8oo~izes that it is not in a position to make any further reoommendation as far as its preCise date, location, agenda and level of partioipants are ooncerned. Sinoe only the Executive Com mittee of WMO is oompetent to consider this question from the point of view of prin oiple, the Commission reoommends that, if the Executive Committee take,s a posi·tive de oision on this issue, the president of CEY and its Advisory Working Group be entrusted with the elaboration of further details of the oonferenoe, in co-operation with the Seoretar,y-General. The Commiesion then adopted Recommendation 9 (CRy-III).
15. SCIENTIFIC LECTURES AND DISCUSSIONS (Agenda item 15)
One meeting (on 16 September 1968) was devoted to the presentation and dis cU8s~onof soientifio papers in hydrometeorology.
The meeting was oha~red by the vice-president of CRy, Dr. Z. Kaczmarek.
The authors and titles of papers read are given beiowl
(1) Work in the United Kingdom on the Aocuraoy of Rainfall Measurement I (a) Origins, Development and Future Plans, by A. Bleasdale, (b) Some Recent Results, by J. C. Rodda; GENERAL SUMMARY 31
(2) Evaluation of Streamflow Networks, by R. W. Carter;
Prinoiples of Modelling and the Use of Electronic Computers in Eydrological Foreoasting, by E. G. Popov.
The Commission expressed its great appreciation to the lecturers and agreed that the above subjeots are of considerable interest to the Commission.
~6. ESTABLISHMENT OF WORKING GROUPS (Agenda item 16)
At the request of the Executive Committee, the Commission disoussed the desi rability of establishing a working group to assist the president in the planning and cO ordination of Commission aotivities, and to advise him, as requested, on urgent matters which may arise between sessions.
The Commission noted that most of its aotivities are related in one way or another to IBD. It noted that the Executive Committee Panel of Experts for lHD had also served as an advisory group to the president of the Commission on an informal basis and had proved most helpful in conducting the activities of the Commission between its se oond and third sessions.
~le Comreission agreed that an advisor,y working group would be extremely use ful, particularly if it could convene each year prior to the meeting of the Executive Commi ttee. This decision is embodied in Resolution 17 (CHy-Ill).
The Commission recognized that the extensive partioipation of WMO in IHD in volves activities falling within the purview of several technioal commissions and will require review and decision by the Executive Committee on a continuing basis. It noted the decision of the Executive Committee on this matter, which is set out in section 4.13.3 of the General Summary of its tventieth session, to authorize the president of WMO to revise the terms of referenoe and the membership of the panel in consultation with the president of CHy and the other WMO technical commissions concerned. The Com mission expressed its opinion that the oomposition of the panel should provide for mem bership from the Advisory Working Group.
The follOwing nine working groups were established to carry out the programme of the Commission between the ttird and fourth sessions, as set forth in their respect ive terms of referenoe:
Advisory Working Group (Resolution 17 (CRy-III)) Working Group on the Guide and Teohnioal Regulations (Resolution 1 (CRy-Ill)) Working Group on Instruments and Methods of Observation (Reso- lution 2 (CRy-III)) Working Group on Water Level and Discharge Measurement (Resolution 4 (CP".y-IJI)) Working Group on Representative and Experimental Basins (Reso- lution 7 (CRy-III))
Working Group on Rydrolog~oal Foreoasting (Resolution 8 (CRy-III)) Working Group on Hydrological Design Data for Water Resources Projeots (Resolution 10 (CRy-III)) W~rking Group on HYdrological Aspects of the World Weather Watoh (Reso lution 11 (CBy-III)) 32 GENERAL SUMMARY
Working Group on Maohine Processing of Hydrometeorological Data (Reso lution 12 (Clly-III)
In addi tion, the following eight rapporteurs were appointed, wi th tasks as specified in the relevant resolutions:
Rapporteur on Instruments (Resolution 3 (CRy-III)) Rapporteur on Lake Evaporation (Resolution 5 (CRy-III)) Rapporteur on Network Design (Resolution 6 (CHy-IU)) Rapporteur on Training in Hydrology (Resolution 13 (CHy-III))
Rapporteur on Estimation of Maximum Floods (Re2.o1ution 9 (CHy-IIT)) Rapporteur on Terminology in Hydrology (Resolu-tion 14 (CHy-IIJ» Rapporteur on Dni versal Dec imal Classi fica tion in H,y drology CResol ution 15 (CHy-Il I)) Rapporteur on ContinentaJ. Drought (ResoluUon ] 6 (Cll,y-T1J»
As far as possible, the chairmen and members of working groups, as well as the rapporteurs, were designated during the session. The presiden-t was authorized to complete the designations and to designate SUllsti -{.u-te8, should an.)' _OT those selected be unable to serve.
The Commission expressed the -wish that the Secretari<-li, , the permanent repre sentativ8e:: and the in"\Tited experts complete the formslit.:ies cor:nectec with the establish ment of the groups and designation of ra:pporteuI's at an early date ~o that their work may begin as soon as possible.
The Commission requested the president to- arrange, in so far as possible, for meetings of the working groups as required.
It suggested tbat the order of priority of working group meetings be consi dered by the president of CHy and its Advisory Working Group.
Wi th regard to the participation in eHy working groups of experts nominated by other UN organizations, the Commission noted that the presen t work.ine arrangements between WMO and these organizations provide for suoh participation when items of a.greed common interest are being oonsidered.
The Commission welcomed the interest expressed by the representatives of Unesco and FAO to partioipate in the work of specific working groups of CHy and agreed that such participation could be arranged by the Secretary-General after consultation wi th the president of CRy and the UN organj zation concerned.
REVIEW OF RESOLUTIONS AND RECOMMENDATIONS ADOF1ED A1' TIlE SECOND SESSIO!>: OF THE COMMISSION AND RELATED RESOLU'I'IONS (Agenda item 17)
In accordance with current practice, the Commission reviewed the resolutions and recommendations adopted_ at its second session wi th a vie1" to eliminating thor,;e which are no longer necessary. As regards the eleven resolutions 8dopted at its second ses Sion, the Commission noted that they have either been superseded by resolutions of the third session or become obGolete. The Commi ssi on therefore dec i ded, in its Resolution 18 (CRy-III) t not to keep in force any of its prior resolutions. GENERAL SUMMARY 33
The Commission further oonsidered the reoommendations adopted prior to its third session and noted the action taken by appropriate bodies on them. Of the six re commendations adopted at its saoond session, only Reoommendation 5 (CRy-II) was oonsi dered as being of continuing value and the Commission wished to retain it in foroe. For purposes of ready referenoe, therefore, it decided to include it as Annex VI of this report. Resolution 18 (CRy-III) was consequently adopted.
The Commission further examined resolutions passed by the Exeoutive Committee in response to the recommendations of its previous sessions. It expressed the view that, providing Recommendations 8 and 9 (CRy-III) are approved by the Exeoutive Committee, all previous resolutions of the Exeoutive Committee should not be kept in foroe. Should, for some reason, the Exeoutive Committee not approve the above-mentioned recommendations of the third session, Resolution 34 (EC-XVIII) should be kept in force. Reoommendation 10 (CRy-III) was subsequently adopted,
18. ELECTION OF OFFICERS (Agenda item 18)
Professor E. G. Popov (U.S.S.R.) was elected president and Mr. J. Rodier (Franoe) vice-president of the Commission.
19. DATE AND PLACE OF THE FOURTH SESSION (Agenda item 19)
Under this item of the agenda, the prinoipal delegate of the Netherlands ex tended the invitation of his Government for the fourth session of the Commission to be held in the Netherlands. The Commission noted this invitation with great appreCiation and further noted that appropriate aotion will be taken in due course by the Secratary General of WMD after consultation with the president of the Commission.
20. CLOSURE OF THE SESSION (Agenda item 20)
In olosing the session, the president expressed his warm appreciation to all who bad contributed to the sucoess of the session and, in particular, to the chairmen of the working committees, Messrs. J. Dtnes and J. Ineson. He also conveyed his gratitude to Mr. D. N. Body, chairman of the Nomination Committee, to Mr. J. Rodier, chairman of the Committee on the Nomination of Experts for Rapporteursand Working Groups, and to the representatives of the WMO Seoretariat. The president thanked also all the confer onoe staff for their exoellent servioes provided during the session. Finally, the pre sident conveyed his best wishes to the newly elected officers of the Commission.
Professor L. J. Tison, on behalf of the partioipants and all sp~oialists ao tive in the field of interest of the Commission, expressed his great appreoiation to Mr. Max A. Kohler for the untiring efforts and effioient way in whioh he had directed the work of the Commission during the eight years of its existenoe. He expressed, in particluar, his appreoiation of the ability with which Mr. KOhler has contributed to the expansion of the work of the Commission and has led it from its very beginning until its tr::i rd session. He finally wished all suocess to Mr. Kohler in his future work and ex presss~~ the wish that he continue to contribute his experience and scientific knowledge to the further work of the Commission.
The session closed at 5.30 p.m. on 20 September 1968. 34
RESOLUTIONS ADOPTED BY THE SESSION
Res. 1 (CRy-III) - WORKING GROUP ON THE GUIDE AND TECBNICAL REGULATIONS IN HYDRO METEOROLOGY
THE COMMISSION FOR HYDROMETEOROLOGY,
NOTING the report of the Working Group on-the Guide and Technical Regulations and the dooUment submitted by the Seoretar,r-General,
CONSIDERING I
(1) The rapid developments that are taking place in hydrometeorology,
(2) The desirability of improving and.ex~ending .the Guide,
(3) The importance of keeping the Guide unde.r continuing review,
(4) The need for oontinuing study of the problems of-preparing Teohnioal Regulations in hydrometeorology, DECIDES,
(1) To establish a Working Group on the Guid.e and Technical Regulations with the following terms of reference:
(a) To study the ma.teria.l conoerning proposed amendments to the Teohni cal Regulations submitted to the third session of CRy;
(b) To prepare a new draft chapter for the Technical Regulations deal ing uniquely with hydrometeorology;
(0) To prepare an explanatory ~emorandum ooncerning the new draft chapter whioh might be used in presenting the draft for considera tion of other inteTested agenoies or individuals;
(d) To collect and prooess revisions proposed f~r updating the Guide;
(e) To prepare new sections to the Guide which will include: (i) Evapotranspiration; (ii) The substanoe of the amendments to the Teohnical Regulations submitted to the t~ird seesion of CHj as part of Chapter I. of the Guide;
(f) To review material prepared by other working groups and by rappor teurs for inclusion in the Guide;
(2) To invite the following experts to serve on the working group:. RESOLUTION 2 35
R. H. Clark (Canada) chairman Z. Kaczmarek (Poland) A. G. Kovzelj (U.S.S.R.) D. Srebrenovio (Yugoslavia) J. H. Thomas (U.S.A.) J. 11. van der Made (Netherlands) (lASH)
(3) To request the working group.
(a) To submit to the president as soon as possible the draft seotion mentioned in 1 (e) (ii) for adoption by the Commission by oorre spondence;
(b) To submit to the president for consideration by the Advisory Work"":" ing Group the draft chapter on Technioal Regulations in hlfdrometeo rology, together with the explanatory memorandum, by 30 November 1969;
(0) To submit draft material and proposed amendments to th~ Guide as they become available;
Cd) To submit a final report not later than six months before the next session of the Commission;
(e) To set out a schedule for receipt of comments from Members for in oorporation in amendments to the Guide to be submitted to the next session of the Commission.
Res. 2 (CHy-III) - WORKING GROUP ON INSTRUMENTS AND METHODS OF OBSERVATION
THE COMMISSION FOR HYDROMETEOROLOGY,
NOTING that the Working Group on Hydrometeorologioal Instruments and Methods of Observation established by the second session of the Commission has prepared so~e material pertinent to its terms of reference, but has not yet completed its tasks,
CONSIDERING.
(1) That the completion of the tasks of the working group is important in view of the responsibility of the Commission towards Members in this fjeld,
(2) That the problem of comparison and standardization of instruments and methods of observation in hydrometeorology is gaining in urgency, as documented by the interest of the IHD programme in this field,
(3) That aotivities of CHy and other WMO commissions in comparison and stan dardization of instruments and methods of observation in hydrometeorology are well ad: va.noed,
DECIDES.
(1) To establish a Working Group on Instruments and Methods of Observation with the following terms of reference: 36 RESOLUTION 3
(8) To complete -the drafting of a Teohnioal Note on automatio equipment for observing and transmi~ting hydrometeorologioal elements, and to prepare a summar.y of this Teohnical Note suitable for inolusion in the Guide;
(b) To take any neoessary aotion to revise and oomplete the material for the Guide on snow measurements, lysimeters, transpiration; and evap?ration from the soil, prepared by other oommissions of WMO;
(0) To prepare a oomprehensive report and oritical appraisal of york already aooomplished within WMO in the field of standardization of instruments a~d methods in hydr~meteorology;
(d) To ex~mine the need and feasibility of oomparison of further ins truments ~nd methods in hydrometeorology, in addition to work al ready unde r way in WMO;
(e) To examine if some of the above inst"ruments and me"thode are alrea (f) To :reoommend & york plan for further activities wi thin WMO in the field of Bt&nd~rdization of hydrological instruments and methods of observation; (2) To invite the following to serve on the working group. E. Walser (Switzerland), chairman M. Hendler (Canada) M. F. E. Hinzpeter (Federal Republic of Germany) K. D. Zavjalov (U.S.S.R.) E. L. Peck (U.S.A.) H. Schaeffer (IASH) (3) To request the working group to submit periodioal reports to the presi dent of CRy and a final report not l~ter th~n six months before the next session of the Commission. Res. 3 (CRy-III) - RAPPORTEUR ON INSTRUMENTS THE COMMISSION FOR HYDROMETEOROLOGY, NOTING. The primar,y responsibility of WMO in the field of instruments in hydrometeo- rology, CONSIDERING. (1) That Members have a oontinuing need for information on" available reli able instruments in the field of hydrometeorolo~, (2) That Members have a continuing need to be kept informed on developments in such instruments, RESOLUTION 4 37 DECIDES. (1) To appoint a Rapporteur on Instruments with the following terms of referenoe, (a) To oollect reoommendations from Members regarding instruments in the field of hydrometeorology whioh they have found reliable in speoified environments, and to consolidate these ~ecommendations in ~ report for the use of Members and others in establishing net works; (b) To oollect similarly and distripute brief notes on new instrumental developments in the field of hydrometeorology; (0) To furnish copies of (a) and (b) above to the p.resident of the Com mission and to the Working Group on Instruments and Methods of Ob servation; (d) To Bubmi t a final report on his activi ti-ss to the prss"ident of the Commission not later than six months before the next session of the Commission; (2) To invite Mr. E. L. Peck (U.S.A.) to aot as Rapporteur on Instruments. Res. 4 (CHy-III) - WORKING GROUP ON WATER LEVEL AND STREAM DISCHARGE MEASUREMENT THE COMMISSION FOR HYDROMETEOROLOGY, NOTING the report of the Working Group on Water Levels and Discharge Measure ment and·Estimation, WELCOMING the publioation of Teohnioal Note No. 90, "Measurement of Peak Dis oharge by Indi reo t Me thods" , CONSIDERING that the working group has made exoellent progress with its dif ficult tasks but has some further work to do on two of them, DECIDES: (1) To establish a Working Group on Water Level an~ Disoharge Measurement with the following terms of reference: (a) To oomplete the draft section for the Guide on determining river disoharge under an ice cover, using material already prepared by the previous working group; (b) To prepare a draft Technical Note on weirs, flumes and other stream gauging structures, using the material already drafted by the pre vious working group, and prepare a oond_eneed verei on for the Guide, (0) To keep stream discharge and stage measuring instruments under re view with the purpose of selecting those which might be suitable for standardization and prepare a report on these to the CHy Work ing Group on Instruments and Methods of Observation; 38 RESOLUTIONS 5, 6 (2) To invite the following to serve on the working group. A. G. Boulton (U.K.), chairman R. W. Carter (U.S.A.) R.' Jansen (Federal Republio of Germany) V. P. Shaban (U.S.S.R.) P. W. Straileff (Canada) J. Staohy (Poland) (3) To request the working group to submit its oompleted draft under (a) and (b) above to the president of CRy and the chairman of the Working Group on the Guide and Technical Regulations as soon as possible, (4) To request the working group to submit its report under (0) above to the ohairman of the Working Group on Instruments and Methods of Observation by 1 July 1970. Res. 5 (CHy-III) - RAPPORTEUR ON LAKE EVAPORATION THE COMMISSION FOR HYDROMETEOROLOGY, NOTING the activities of the elMO Working Group on Evaporation Measurement, CONSIDERING that much additional value could b. obtained from the data being collected by applying them to studies on the reliability of estimating lake evaporation, DECIDES. (1) To appoint a Rapporteur on Lake Evaporation with the following tasks. (a) To prepare a report for tbe.next session of the Commission on re sults of studies relating pan evaporation (and relevant meteorolo gical observations) to lake evaporation, with speoial attention to data colleoted at the elMO oomp~riBon sites in Member States; (b) To report also on the status of techniques for reduoing. evapora tion from reservoirs; (c) As appropriate and upon request, to assist in WMO participation in the IBD project; (d) To submit a final report on his aotivities to the president of the Commission not later than six months before its next session; (2) To invite Mr. C. E. Hounam (Australia) to aot as Rapporteur on Lake Evaporation. Res. 6 (CHy-III) - RAPPORTEUR ON NETWORK DESIGN THE COMMISSION FOR HYDROMETEOROLOGY, CONSIDERING: (1) That network design and operations are oentral among the responsibili ties of the Commission, RESOLUTION 6 39 (2) That the lflI!O Guide to HydrometeoTologicaJ Practices (first edi tion, 1965) contains recommendations for the establishment of networks on major elements, (3) That tha prinoiples of network design are continuously being developed and improved and that network design is a necessary field of research, NOTING that a case-book of actual networks in different geographio and 01i :;"a1.io zones and in areas of different stages of water resources d.evelopment, wi th expla Ylai;ory notes on objective"s and principles applied, would be a practioal guide to develop ing countries, DECIDES: (1) To appoint a Rapporteur on Network Design to carry out the following responsibilities: (a) To assist the WMO Secretariat in the preparation of a case-book of examples o-f networks, together witt explanatory notes on objectives and prinoiples applied. The examples should be seleoted from vari ous geographic and climatic zones in oountries in different stages of water re.sources development and should include the elements of network design now contained in the Guide, as well as networks of Boil moisture observations and of fluctuations in groundwater levels (the latter two elements in co-operation with all other in ternational and intergovernmental organizations concerned and in particular wi th the I.HD Secretariat and FAO); (b) To act as one of the representatives of WMO, whenever possible, in tte IBD Panel of Experts on Network Planning or in other bodies concerned with this problem, and to assist the above panel in the derivation of effective criteria for planning and design of net works wi thin the present terms of reference of the panel; (c) On the basis of preceding items (a) and (b), to prepare new mate rial on network design to be referred to the CRy Working Group on the Guide and Technical Regulations for inclusion in the WMO Guide to Hydrometeorological Practicesj (d) To advise and assist the president of the Commission and the WMO Secretarjat in scientific co-ordination of WMO activities in net work design in the fields of hydrology and those parts of meteoro logy which are related to hydrology; (e) To report to the fourth session of CHy and to the president of the Commjssion as appropriate, on the scientific developments and ac tions taken by WMO and other international organizations in the field pertinent to the above terms of reference; (f) To submit a final report on his activities to the president of CHy not later than six months before the next session of the Commission; (2) To invi te ~·!r. W. B. Langbein (U.S.A.) to act as Rapporteur on Network Design. 40 RESO LUTION 7 Res. 7 (CRy-III) - lIORKING GROUP ON REPRESENTATIVE AND EXPERIMENTAL BASINS TRE COMMISSION FOR HYDROMETEOROIJ)GY; NOTING the Report of the CRy Working Group on Representative and Experimental Basins presented at its third session, OBSERVING that the terms of referenoe of the group had been drawn up too late for the tasks entrusted to it to be oarried out in full, CONSIDERING: (1) The importance, in exchange of data On representative and experimental basins, of making reoommendations with a view to obtaining data easy to compare, (2) The advantage of avoiding loss of time due to the resumption of the same aotivities by another working group, (3) The steps taken to ensure the co-ordination of the aotiviti~s of this working group with those of the Working Group on Representative and Experimental Baaine of the Co-ordinating Council of the International Hydrologioal Deoade, DECIDES. (1) To re-establish the Working Group on Representative and Experimental Basins with the following terms of referenoel (a) To review the draft note on benohmark basins and reference olimato logical stations before its pre~entation to the lHD Co-ordinating Council Working Group on Representative and Experimental Basins; (b) To oomplete the preparation-of precise recommendations for a small number of simple, well-tried methods and, if possible, in oertain oases,for one simple metbod for oertain operations involved in the analysis of rainfall-runoff relations for a study of floods and hig!\-flow periods. These methods s)lould deal "i th the following points: Determination of mean precipitation depth for the basin, storm by storm; Establishment of storm-by-storm rainfall intensity grap~s; Separation on hydrographs of surface runoff from other forms of flow, yiz. interflow and groundwater flow; Determination of time to peak flow andduration of runoff etc.; Choice of an index representing soil moisture at the begin ning of each storm; Determination of the time-lag between maximum temperature and daily maximum diaoharge during the period of snowmelt runoff! Determination of the ooeffioient of depletion determining the recession pattern of the snQwmelt hydrograph; Infiltration .tu~ upder field oonditions! Stu~ of Burf"ce and "sv.baurface inter-relationship; RESOLUTION 8 4. (0) To prepare guidelines such as will assist the experts appointed by the Seoretariat in co-operation with HMO Regional Associations .in defining typical storms in the principal natural regions; These typioal storms will oorrespond approximatively to the five year to ten-year storms. They should be defined by all their char acteristics: total depth, areal distribution, intensity graphs and moisture of the soil at the beginning of precipitation, in ord-er to caloulate hydrographs of runoff and to facilitate comparison between resulting floods on various repres'entative basins I (a) To provide advice and guidance to the president of the WMO Commis sion for Hydrometeorology, as requested, on all matters relating fu the different categories of stations and basins and possibly also to study additional items supplementing the work of the IHD Co ordinating Council working group, as may be agreed by the two Secretariats; (e) To prepare, in co-operation with the Working Group on Hydrological Forecasting, recommendations for a r~O study project on the flow process in experimen tal basins for hydrological forecasting require ments. Close oontact between this working group and the Working Group on P~drological Design Data should be maintained; (2) . To invite the following persons to· serve on the working group~ J. A. Rodier (France), chairman (lASH) N. v. Cordeiro (Brazil ) J. G. S. McCullooh (U. K. ) G. Peczely (Hungary) A. Y. Schaohori (Israel) v. A. Uryvaev (U.S.S.R. ) (3) To request the working group to submit as soon as possiple, and not later than 30 September 1971, or at the latest, six months before the next sessiop of the Commission, the draft texts of recommendations provided for under items (b) and (0) in the terms of reference; AUTHORIZES the president of the Commission for Hydrometeorology to terminate the activities of the working group as soon as the tasks specified under items (b)t (0) and (e) of the terms of reference have been completed. Res. 8 (CF~-III) - WORKING GROUP ON HYDROLOGICAL FORECASTING TRE COMMISSION FOR HYDROMETEOROLOGY, NOTING the report of the chairman of its Working Group on Hydrological Fore casting established at the second session of the Commission, CONSIDERING: (1) That the working group was unable to complete the task of drafting a Technical Note on hydrologjcaJ forecasting in the time available, 42 RESOLUTION 8 (2) That the Co-ordinating Council of the IHD has requested that WMO should continue to provide the technical secretariat for that part of the IHD project on hydro logical foreoasting ~hioh is Qonoerned with surface water, (3) That the field of hydrological forecasting is one in which developments are continually occurring and that the Guide should be kept up to date in this important section, DECIDES: (1) TO re-establish the Working Group on HYdrological Forecasting with the f~llowing terms of reference: (a) To finalize the preparation of a Technical Note on hydrological foreoasting; (b) To prepare revisions for the Guide inoorporating the latest devel opments in teohniques, for consideration by the Working Group on the Guide; (0) To prepare a report on the methods available for benefit-cost as sessment of systems o~ hydrological forecasting; (d) To co-operate with CSM on the problem of the applioation of meteo rological forecasting to long-range hydrologioal foreoa.sting; (e) To consider developments in the World Weather Watch planning rele vant to hydrological forecasting; in oo-ordination with the CRy Working Group on Hydrological Aspects of the World Weather Watch; (f) To maintain liaison with IBD Pane} of Experts on Hydrological Fore casting; (2) To invite the following experts to serve on the working group: P. J. Mi1jukov (U.S.S.R.), ohairman D. N. Body (Australia) J. H1adny (Czechoslovakia) T. J. Nordenson (U.S.A.) L. Serra (France) C. J. E. Schuurmans (Netherlands) A representative of India (3) To request the working group to submit to the president of the Commis sion for F~drometeorology: (a) The draft Technical Note, not later than 30 June 1969; (b) Reports on those aspects defined as being suitable for internatio- na1 activity, by 30 June 1970; (c) A final report on its activities and reoommendations for future action by WMO in this area, six months before the next session of the C_ommission; RES.oLUTI.oNS 9, 1.0 43 (4) To request the working group to submit to the ohairman of the Working Group on the Guide proposed amendments to the Guide covering aspects of hydrologioal foreoasting,by 1 December 1970. Res. 9 (CRy-III) - RAPPORTEUR .oN MAXIMUM FLO.oDS THE C.oMMISSI.oN. F.oR HYDR.oMETE.oR.oLOGY, NOTING that action reoommended by the second session of the Commission on the subject of estimation of maximum floods has been completed and, in particular, that a Technical Note on Estimation of Maximum Floods has been prepared and is to be published by WM.o, CONSIDERING that several other international bodies are concerned with this field of hydrology, but that it requires oonstant attention from WMO since a strong hydrometeorological input is necessar.y to this subject, DECIDES, (1) To appoint a Rapporteur on Estimation of Maximum Floods with the fol lowing tasks: (a) To follow all international developments in this field and to o'on vey the views of WMO in pertinent international discussions on this subject; to represent the Commission, whenever possible, in meet ings of bodies concerned with this subject, particularly the IHD Co-ordinating Council Working Group on Floods; (b) To keep the President and Members informed of the above interna tional developments and to suggest necessary action to the presi dent of CRy and to the Executive Committee Panel of Experts on IHD and the Secretary-General when required; (c) To assist the Working Group on the Guide with suggestions regarding material on estimation of maximum floods to be incorporated' in later revisions of the Guide; (d) To present a report, at least six months before the next session of the Commission; (2) To invite Mr. M. Podani (Romania) to act as Rapporteur on Maximum Flood,s. Res. 1.0 (CRy-III) - W.oRKING GROUP .oN HYDR.oLOGICAL DESIGN DATA FOR WATER RESOURCES PR.oJECTS THE C.oMMISSI.oN FOH HYDR.oMETE.oROLOGY, N.oTING: (1) That the problem of inadequacy of data for the design of water resouraes projects has been engaging the increasing attention of. the Commission, 44 RESOLUTION 11 (2) That the WMO Guide to Hydrometeorologioal Praotioes nOll oontains an annex: on applications to water management, (3) That prinoiples of design affeoting water resources management are con ti~ously being developed or improved, CONSIDERING that there is a need for a comprehensive reference work dealing with basio design aspects of water resouroes projects where inadequate data are avail able, DECIDES, (1) To appoint a Working Group on Hydrologioal Design Dat~ -for Water Resources Projects wi th the following terms of reference: (a) To examine all material published or prepared by WMO bodies, con taining guidance material on selection of hydrometeorological series in speoific oases, statistical analyses of,hydrometeorological vari ables, correlation methods for hydrorneteorological variables, synthesis of hydrometric data, depth-are a-duration analyses, design flood studies, flood-frequency analyses, flood-rou~eing procedures, utilization of flood-forecasting techniques for design; To propose w8¥s of integrating this material in an annex on hydro logical design data for water resources projects to the Gutde to Hydrometeorological Practices; (0) To follow development in this field"within other international or ganizations, partioularly ECAFE and FAO, and to maintain liaison and assist the IBD group of experts established under the terms of Resolution 111-5 of the IHD Co-ordinating CounCil; (d) To advi se the president of the Commission on rna tters related to this problem; (e) To prepare and submit a report on its activities to" the fourth" ses sion of CRY not later than six months before this seSSion; (2) To invite the following experts to serve on the working group: R. D. Markovi6 (Yugoslavia), chairman K. M. Kent (U.S.A.) K. Krajewski (Poland) H. J. Liebscher (Federal Republic of Germany) M. Negev (Israel) L. J. Tison (lASH) A representative of India Res. 11 (CRy-III) - lIORKING GROUP ON HYDROLOGICAL ASPECTS OF TIlE WORLD WEATHER WATCH THE COMMISSION FOR HYDROMETEOROLOGY, NOTING the report of the Working Group on Hydrometeorologi"cal Aspects of the World Weather Watoh, RESOLUTION 12 45 CONSIDERING that thp. tasks of the working group are of a oontinuing nature so long as the programme of the World Weather Watch is in its developmenta.l rhases, DECIDES. (1) To establish a Working Group on F~drological Aspects of the World Weather Watch with the following terms of reference: (a) To investigate ways in whioh the WWW might be developed so as to be of greatest value and benefit to hydrological services, including the programme of IHD, and to recommend appropriate action by WMOj (b) To REsess and evaluate in~ormation received on ntudies on the de termina tion of snow and ice cover a.nd any othe:- hydrome teorologioal parameters by artificial satellite observa,tfons and to suggest courses of aotion which would increane the value of these studies; (c) To continue the study begun by the preceding working group on hydro logical requirements for weather radar data and on current capa bili ties in meeting the.Be requirements with a vi~1f to assisting, if' requested by the presid.ent, in the preparation of a report on tr.e subjeot, and also to .submjt its own report as results of' additional study beoome available; To submit annual reports to the president ann. a final summary re port on its aotivit.ies not later than six monthA before the next session of' the Commission; (2) To invite the following to serve on the Wo:::-king GroUl} on HyJirologioal ABpects of the World Weather Watch: J. Harding (U.K.), ohairman J. P. l'ruce (rASH) H. 1. Ferguson (Canada) A. F. Flanders (U.S.A.) A. F. Rainbird (Australia) D. Radinovi6 (Yugoslavia) V. V. Rakhmanov (U.S.S.R.) Res. 12 (CHy-IrI) - WORKING aooup 011 MACHINE PROCESSING OF HYDROMETEOROLOGICAL DATA THE COMMJSSIOII FOR HYDROMETEOROLOGY, NOTING the report of the Working Group on Macr.ine Processing of Hydrometeoro logi oal Data, CONSIDERING: (1) That oertain events have prevented completion of the draft Technioal !'rote, (2) That good progress has been mad.e and much valua.ble mat-erial already 001- lec~ed and written, 46 RESO LU'rrON 13 (3) "That recent developments in connexion with the WWW and the IHD make a Technioal Note on this Bubjs.ct of inoreased value, DECIDES, (1) To establish a Working Group on Machine Processing of HYdrometeorologi cal Data with the following terms of reference: (a) To oomplete the preparation of a draft Technioal Note, already sub stantially begun by the working group established by Resolution 4 (CRy-IT), on machine methods for the collection, quality control, processing and publication of hydrometeorological data, including material on storage and retrieval problems, but concentrating above all on the me:thods of bringing checked and corrected data into pel.' manent storage form, and having regard to the means available in countries at various stages of development; To condense portions of the Technical Note on data ooding and transmjssion for inclusion in the GUide and to refer it to the Working Group on the Guide and Technical Regulations; (c) To consider and report on the relationship between methods reoom mended in the Technical Note and the more advanced and rapidly de veloping systems which are envisaged in the context of WWW, the lED project on the acquisition, transmission and processing o~ data (SAPHYDATA), and any other related or similar activities. In this connexion, principal attention will be given to hydrologioal ap plioations (for instance, area rainfall estimates); (2) To invite the following to serve on the working group: W. L. Isherwood (U.S.A.), chairman A. Bleasdale (U.K.) U. Mane (Israel) E. Rodriguez Barrios (Venezuela) V. Stanesou (Romania) A representative of U.S.S.R. A representative of eel (3) To request the working group to give urgent priority to completion -of (1) (a) above as soon as possible and to make an early start on a survey of available material under (1) (b); (4) . To present a final report not later than six months before the next selir sion of the Commission. Res. 13 (Clly-III) - RAPPOR'reUR ON TRAINING IN HYDROLOGY THE COMMISSION FDR HYDROME'reOROLOGY, CONSIDERING that training is one of the most important tasks for development of work in the field of hydrology, RESO LUTION 14 47 NOTING: (1) That within the IHD programme and in the aotivities of Unesco conside~ able attention has been devoted to the promotion of this training and eduoation, (2) That wi thin WMO there are fields of specific interest in the training of hydrologists and hydrometeorologists, DECIDES: (1) To appoint a Rapporteur on Training in Hydrology with .ihe following tasks: (a) To recommend to the president of the Commission and the Secretar.y General of WMO steps to be taken by WMO in promoting training of personnel in aonnexion wi th special WMO programmes such as network desjgn, hydrological implications of the World Weather Watch, and hydrologioal foreoasting; (b) To assist in introducing hydrology and hydrometeorology in the WMO meteorological training centres and to recommend material which should be included in the WMO guidance publications on training. This work should be undertaken in close co-operation and ln accord ance with the work of the WMO Executive Committee Panel of Experts on Meteorological Eduoation; (c) To follow closely the work of institutions on hydrological educa tion established by other bodies and· organizations, in particular within the Co-ordinating Council of the International Hydrological Decade and by Unesco. He should partioularly recommend hydro~eteo rological material to be included in guidance publications in the IHD ~rogrammet if so requested; (d) To present a report not later than six months before the next ses sion of the Commission; (2) To invite Mr. K. A. Hzmaljan (U.S.S.R.) to act as Rapporteur 011 Training in Hydrology. Re s. 14 (CRy-III) - RAPPORTEUR ON TERMINOLOGY IN HYDROLOGY TRE COMMISSION FOR HYDROMETEOROLOGY, CONSIDERING that the preparation of a joint WMO/Unesco Multilingual Glossary is well under way and that the projeot will be best implemented by a joint panel from the WMO and Unesco Secretariats, with the help of oonsultants, DECIDES: (1) To nominate a Rapporteur on Terminology in Hydrology wi th the following responsibilities: (a) To keep undeT periodical survey progress in the field of terminol~ 48 RESOLUTION 15 in hydrology and, in particular, the work on the preparation of a WMO/Unesco Multilingual Glossar.y; (b) To keep members of CRy and the president of the Commission informed on developments in this subjeot ~hen appropriate; (0) To prepare a report for the fourth session of the Commission not later than six months before this session;' Cd) To keep olose contaot with the Rapporteur on Universal Decimal Classifioation in Hydrology on the use of this olassification in the Glossary J (2) To invite Mr. M. Jacobe (Israel) to aot as Rapporteur on Terminology in Hydrology. Res. 15 (CHy-III) - RAPFDRTEUR ON UNIVERSAL DECIMAL CLASSIFICATION IN HYDROWOY THE COMMISSION FOR HYDROMETEOROWOY, NOTING, _(1) That the unique basic-number for hydrology within theUDe has been agreed, (2) That a detailed schedule for hydrology within the UDC has been prepared and published and, therefore, officially adopted, (3) That work is ~ell under way ~or the ~ublication of a Guide to UDC in Hydrology, CONSIDERING that there a~e several other tasks to be followed up on this subjeot, DECIDES, (1) To appoint a Rapporteur_ On Univ8-Tsal Deoimal- Classificatiol'l: in Hydrology with the following responsibilities: (a) To fall-ow the work and- to assist the Seoretariat in the preparation of the Guide_to UDC in Hydrology and, in particular, to assist in the ci-rculation of this Guide for its final editing and translation and to cOiltinue th~ up-da'ting and feedback of UDe sohedules; (b) To review the p;robl"em of long.... range planning for water information and data systems; (c) To co-o-perate rl-th FtD -in the developments wi thin the field of in -terest Qf' 'the Comlilissi_on; To co-operate witb lASH in preparing an expansion and modification "of the UDe schedule for grmindwa:te-r hydrology; (e) To oo-Opera te with the CIl;Y Rapporteur on Terminology in Hydrology in order to appiy UDe to the Glossary; REsa LUTION 16· 49 . (r) To propose tt.e execution of Ii brary surveys on the use of me so that the original survey oonducted in 1962 can be updated; (g) To Bubmi t periodioal reports to the president of the Commtssion and tpe CRy members on the above tasks, and to submit a final report to the fourth session of CRy, not later than six months before this session; (2) To invite Mr. M. Rigby·(FID) to act as Rapporteur on Universal Decimal Classifioation in Rydrology. Res. 16 (CRy-III) - RAPPORTEUR ON CONTINENTAL DROUGHT TIlE COMMISSION FOR HYDROMETEOROLOGY, CONSIDERING. (1) The widespread damage and suffering caused by continental droughts and the implioation of drought for the hydrologioal services and activjties, and (2) The need to be kept informed of new developments in studies ,0£ the causes of continental droughts and means of forecasting Bueh events. DECIDES. (1) To appoint a Rapporteur on Continental Drought with the following tasks. (a) To prepare a oomprehensive a.nd ori tical review of 'Work done on dif ferent types of oontinental drought and to submit the report to the president of the Commission by July 1970; (b) To review the methods of foreoasting droughts for roedium- and long-range periods and suggest ways and means of impr6ving them for praotioal utilization; (0) To present to the Commission any suggestions conoerning studies 00- ordinated between various oountries concerned and between meteoro logists, hydrologists and agrioulturists on particular droughts of larger extenSion; When requested, to represent the Commission on other committees or groups whioh may be. set up for examination of the problems of droughts, ensuring adequate co-ordination; (e) To submit a final report to the fourth session of the Commission not later than six months before this session; (2) To invite Mr. L. Serra (France) to aot as Rapporteur on Con tinen tal Drought. ------ RESOLUTIONS 17. 18 Res. 17 (CHy-UT) - ADVISORY wORKmci GROUP THE COMMISSION FOR HYDROMETEOROLOGY. NOTlllG paragraph 7.13.5 of the General Summary of the Abridged Report m£ Fifth Congres-s, and CONSIDERING that it 'Would be desirable to have a working group to assist th~ president in the co-ordination and planning of Commission aotivities, partioularly as they may relate to IHD, and to "be available for consultation on important topics - whioh may arise between sessions, DECIDES", (1) To establish an Advisory Working Group of CHy with the following term. of reference J (a) To assist the president in providing advie6 or in taking action on urgent matters referred to the Commission which cannot be dealt with adequately by the regular working groups or by oorrespondence, (b) To assist the president in reviewing the progress of the work of the Commission and'in planning its future programmes, (c) To assist the president in· the seleotion of experts and oon~ul tants for partioular assignments, (d) To assist the president in maintaining a continuing review of Com mission aotivities related to lHD; (2) To invi ts the following to serve on the working group: president of the CommiE;lsion for Hydrometeorology (chairman) vice-president of.the Commission for Hydrometeorology past· president of the Commission for Hydrometeorology D. N. Body (Australia) R. H. Clark (Canada) J. Harding (U.K.) Res. 18 (CHy-III) - REVISION OF THE RESOLUTIONS AND RECOMMENDATIONS OF THE COMMISSION FOR HYDROMETEOROLOGY THE COMMISSION FOR HYDROMETEOROLOGY. CONSIDERING that Resolutions 1 to 11 (CRy-II) have been either superseded by, or incorporated in, resolutions of its third session, NOTING the action taken on the recommendations adopted by CRY prior to its . third session, DECIDES: (1) Not to keep in foroe Resolutions 1 to 11 (CHy-II); RESOLUTION 18 51 (2) °To note with satisfaction the aotion taken by the competent bodies on its Recommendations 1, 2, 3, 4 and 6 (CBy-II), whioh are now redundant and should not be kept in foroe; (3) To keep in force Reoommendation 5 (CRY-II) and to include its text in Annex VI to the report of the third session. 52 RECOIfMENDATIOlIS ADOPTED BY THE SESSIOH Reo. 1 (Clly-III) - TEClIHICAL REGULATIONS TIl HYDROMETEOROLOGY AlfD HYDROMETRY THE COMMISSION FDR HYDROMETEOROLOGY, NOTTIlG: (1) Reoommendation 1 (Clly-II) including its annex, (2) The Abridged Report of the seventeenth sossion of the Executive Cammi ttee - General Summa~J, paragraph 5.5.8.2, (3) The Abridged Report of Fifth Congress - General Summa~J, paragraph 7.4.~, (4) Resolution 1 (Clly-III), (5) Recommendation 9 (Clly-III), CONSIDERTIlG: (1) Its deoision to establish a Working Group on the Guide and Technioal Regulations, (2) That the adoption b;y WMO of Technical Regulations on some of these topics would imply that the Organization is accepted as the appropriate body for dei'ining standards in the field of hydrometry, (3) That many national authorities which have responsibility for hydrometric measurements have no direct association with the representation of Members :wi th WMO, (4) That experts from both meteorological and hydrological agencies of Mem ber co~~tries should have the opportunity to examine any proposed Technical Regulations in hydrometeorology before submission to Congress for adoption, RECO=TDS, (1) That appropriate action be taken to convene an intergovernmental meet ing at which delegations comprising experts from both meteorological and hydrological national agencies oould disouss the situation desoribed in "COJITSIDERING" above and re view the proposed new chapter on Teohnical Regulations in hydromet~orologyj (2) That the meeting be planned to take place about six months after dist~i bution of the draft chapter (whioh has been requested for submission by 30 November 1969) so that a deoision reg~rding a proposal for adoption can be made prior to Sixth Gongress. RECOMMENDATIONS 2, 3, 4 53 Reo •.2 (CRy-III) - nrFOlU\lATION ABOUT ORGANIZATION OF HYDROLOGICAL AND HYDRO).IETEOROLO OICAL SERVICES OF THE. MEMBER COUNTRIES THE COMMISSION FOR HYDROMETEOROLOGY, ~TOTING the report on organization of national Hydrological and Hydrometeoro logioal Services prepared by the Seoretary-General on the previous racommendati.on of the Commission, and on reoommendation of the Exeoutive Committee Panel of Experts for lED, CONSIDERING that this report presents oonsiderable interest for many Member Sta tas, RECOMMENDS that the Secretary-General: (1) In order to oorrect any inaccuracy in the report, invite all Members to check the information about the organization of the Hydrological and Hydrometeorological Services in their respective countries appearing in the report, inoluding names ani ad dresses, and to submit corrections, if any, by 1 January 1969; (2) Arrange for inclusion in the tables of the report of more detail~d in formation as received from the inquiry; and (3) Arrange for general oirculation of this report to Members and other in terested parties, in an appropriate publication. Rec. 3 (CRy-III) - CO-ORDINATION BETWEEN MEMBERS' IW,TEOROLOGICAL, HYDROLOGICAL AND OTHER SERVICES CONCERNED THE COMMISSION FOR HYDHOMETEOROLOGY, NOTING that, in oertain countries, work in the field of meteorology, hydro logy and water resources is carried out by various services, and CONSIDERING the necessity for co-ordinating on a national basis the activity of services responsible for meteorology, hydrology and water resources: RECOMltIENDS that the attention of Members be drawn again to: (1) The necessity of maintaining and improving co-ordination between meteo rological, hydrological and other services concerned with meteorology and hydrology; (2) The neoessity, in the first place, of co-ordination in the design of meteorological and hydrological networks, the data from which are indispensable to hydro logical foreoasts and water-balance computations, and for co-ordination of observations from these networks. Reo. 4 (CRy-In) - lIMO PARTICIPATION IN THE lHD PROGRAMME ON THE WORLD WATER BALANCE THE COMMISSION FOR HYDROMETEOROLOGY, NOTING that the IHD Co-ordinating Council and its Working Group on World Water Balanoe recognized several activities of WMO as important for the IHD programme concern ing the establishment of the World Water Balance, 54 RECOMMENDATION 5 NOTING with satisfaction the action taken by the Executive Committee Panel of Experts on IHD and the Secretary-General in integrating these activities in the lIMO/IND projeot: Methodology of Computation of Hydrometeorological Elements for World Wate:r Balance, RECOMMENDS: (1) That WMO continue its assistance to the IHD Co-ordinating Counail in the development of methodology of oomputation of hydrometeorological elements for the World Water Balance, in the framework of the above-mentioned WMO/IHD project; (2) That the Executive Committee Panel of Experts on lED review this project periodically and recommend ways for its implementation; (3) That the Seoretary-Genflral, in conSUltation with the president of CRY and COl, oonsider the possibility of the preparation of world maps of preCipitation and evaporation in- co-operation with Unesco and that, if possible, preliminary studies for these maps be presented to the Symposium on World Water Balance to be held in the United Kingdom in 1970; (4) That the Secretar,y-General present to the next session of the Commission a report on the reBul ts of WMO participation in tl~is nm projeot. Reo. 5 (ClIy-III) - lIMO/IND PROJECT ON RYDROIJ)GICAL FORECASTING THE COMMISSION FOR RYDROMETEORQIJ)GY, CONSIDERING the continuing development of_techniques for hydrological fore- casting, NOTING: (1) The oontinuing interest of Member oountries in the development of teoh niques for improving p~ocedures for hydrological forecasting, (2) The endorsement by the fourth session of the Co-ordinating C.ouncil of the IHD of a proposal by liMO for 'Work in partioular areas of this topic, RECOMMENDS: (1) That the Seoretar,y-Oeneral appoint oonsultants to prepare reports on the following topiCSl (Q.) The applioation of recent research results in "miorohydrologyll to problems of forecasting oatchment runoff behaviour; (b) The application of conceptual models, using computers, in hydrolo gical foreoasting; (2) That the Exeoutive Committee Panel of Experts for IHD oonsider periodi cally the developments on the above projects and recommend the best ways for their fur ther implementation. RECOMMENDATIONS 6, 7 55 Rec. 6 (Oily_III) - lIMO PUBLICATIONS IN THE' FIELD OF INTEREST OF CIly THE COMMISSION FOR HYDROMETEOROLOGY, NOTING that a constantly g~owing number of WMO publications attracts great attention from wide oiroles of speoialists in the field of hydrology, partioularly the IIMO/IHD reports, CONSIDERING. (1) That it is necessary that a suffioient number of copies be available to satisfy the demand. for these publications, (2) That it is necessary to bring the existence of such publications to tte 3t.tention of the widest possible oircle of speCialists, RECOMMENDS. (1) That the publications in the series of WMOjIHD reports be printed as publications for sale, ';.". (2) That the Executive Committee authorize a free distribution of one copw of all the publioations in this seri~s and of some other publications, in particular in the series of Teohnical Notes, in addition to the normal free distribution, to all national committees for IHD and to a very limited number of institutions, ~s reoommended .by.the president of the Commission • . Rec'. 7 (CIly-III) - lIMO/Unesco JOINT PROJECT ON TERMINOLOGY THE COMMISSION FOR HYDROMETEOROLOGY, NOTING the first'draft of the Multilingual Glossary of Rydrology prepared by the CRy-II Working Group on Terminology and by the joint tlMO/Unesco Panel on Terminology in Hydrology, CONSIDERING the urgent need for publication of a list of hydrological terms with equivalente in the four offioial languages of WMO, RECOMMENDS. (1) That the Secretary-General publish at an early date, and jointly with Unesco, the list of equivalente oontained in the above-mentioned report but after review by the oonsultants of WMO and Unesoo of the comments on this list of equivalents, to be reoeived by the Seoretariat not later than 31 December 1968; : (2) That the joint WMO/Unesoo Panel on Terminology in HYdrology continue to funotion, with the HMO partiCipation extended if possible to three members, one of whom should, -whenever possible, be the rapporteur. The panel should concentrate primarily on the following tasks: (a) To oo-ordinate the work being performed under the auspices of WMO and Unesoo; 56 RECOMMENDATION 8 (b) To revise the programme of york as the need arises and to reoom~eqd the best ways and means of implementing this project. Rec. 8 (CHy-III) - liMO PARTICIPATION IN TRE IHD TRE COMMISSION FOR HYDROMETEOROLOGY, NOTING the present partioipation of WMO in the lED, CONSIDERING the relevant deoisions of Cg-V (Resolution 27) and EC-YJl (Res9- lution 16), RECOMMENDS, (1) That it would be appropriate for WMO partioipation in the lHD programme to be implemented in such a way that WMO assumes primary responsibili.ty for those :parts of the IHD programme which are of an operational character, particularly in the follow ing fields: (a) Network design and operation; (b) Standardization of instruments and methods of observation in hydro logy; (0) Operational systems for acquisition, transmission and processing of data in hydrology (which are olosely related with the WMO World Weather Watoh programme); (d) MeteorQlogioal and hydrological data Tor water resources projects; (e) Methods of oomputation of hydrometeorological elements Tor purpQses of water balances; (f) Hydrological forecasting; (g) Assistanoe in the development OT meteorological and hydrological services; (h) Preparation o~ guidance material for operational purposes in the above fields; (2) That the Executive Committee and the Secretary-General take appropria~e steps to inform the Members and international organizations of RECOMMENDS (1) above in order to avoid duplication of effort and to ensure appropriate co-ordination with re lated aotivities; (3) That the Exeoutive Committee Panel of Experts for IHD keep under const~ review the development of the IHD programme and advise the President of the Commission and the Secretar,y-General on the implementation of WMO partioipation in this programme. RECOMMENDATION 9 57 Rec. 9 (ClIy-III) - LONG-TERM PLAN OF ACTION IN HYDROLOGY THE COMMISSION FOR HYDROMETEOROLOGY, NOTING. (1) That the twentieth session of the Executive Committee has requested that it examine the possibility of a long-term plan of action in the field of hydrologyt (2) The international developments in the field of hydrology, (3) That the Mid-Decade Conference is to exchange views on a possible long term plan in hydrology, (4) Recommendation 1 (ClIy-III), CONS IDERING • (1) The close rel~tionBhip between meteorology and hydrology, (2) WMO's experienoe and organization which adequately equip the Organiza tien to assume responsibilities for international co-operation in operational aspec1;s of hydrology, RECOMMENDS. (1) That ~{O should assume, by the end of th~ IHD, responsibility for the international co-operation of: (a) The operational aspects of the collection, transmission, processing and publication of' hydrological data related to the land phase of the h3drologioal cyole; (b) Research, development, improvement and promotion of methods, proce dures and teolnliques in design of networks and standardization of instruments and methods of observation and the operational phases of hydrological forecasting, and supply of meteorological and hydro logical data for the design of projects; (2) That the name of the Commission for Hydrometeorology be changeli to "the Commission for Hydrology", and that its terms of reference be changeci to reflect its responsibilities more clearly and to minimize oonfusion over terminology; (3) That, in order to ensure that the views of national Hydrological Servi~ are taken into aooount in any decisions affecting their interest, the above problem be considered at an international intergovernmental meeting of experts from both Meteoro logical and HYdrological Servioes which it ie proposed to convene, also in oonnexion with the Teohnioal Regulations mentioned in Reoommendation 1 (CHy-III), (4) That the F,yeoutive Committee of WMO consider this ~uestion from the point of view of principles and that, if the Exeoutive Commi ttee takes a positive deoi sion on this issue, the president of the Commission and its Advisory Working Group ·be entrusted with the elaboration of further details of the conference, in co-operation with the Secretary-General. RECOlIiMENDATION 10 Eteo. 10 (CllY-III) - REVISION OF RESOLUTIONS OF TRE EXEClJTIVE COMMITTEE BASED Oll PRIWIOUS RECOw.,~E1'TL1\~JONS OF THE COMMJSSIOK FOR EYTIHOMETEOROLOGY TRE CO''''''TSSION FOR llYJ'ROMETEOROLOGY, NOTING wi th satis~Bct:ion the action taken by the Executive Commi ttee on the -rrcvi(;us recommendations of the Commiesion for P"ydroIDPteorology, COHSIDERING that ma:1'y of these recoom("':r;dationE' have t-e~orr:e redundant in the moantim8, RECO!'t!ME:"JDS: (1) Tl~at the follcwjng ~xec"'.ltive C:omrr.i i.tee resoluticns be no longer - consi dered necezsaI'"'J: 24 (EC-XVI), 12 (Be-XVII), 13 (Be-XVII); (2) That, providing t:te Executive Comrnjt1.ee approves Recommendations 8 and. 9 (CEy-III), Resclutjor: 34 (EC-XVJJI) be al~o considered unnecessary. 59 ANN E X I Annex to paragraph 3 of the General Summary RELEVANT mINTS OF THE REmRT OF THE PANEL OF EXPERTS FOR THE IHD Pres.ent scope of WMO partioipation in the IHD (1968) 1. The actual IED projeots for whioh ¥MO assumes the teohnioal seoretariat are: Depth-duration-frequency studies of preoipitation in various geographioal regions; Water vapour flux evaluation for the hydrological budget; Measurement of precipitation inoluding snowfall and snow pack; Radar measurement of rainfall; Studies on benchmark basins and reference climatologioal stations; Research project on inoidence and spread of oontinental draught; Studies on recommended methods for the computation of evaporation amounts for World Water Balance studies; Preparation of guidanoe material for extension of preoipitation data and estimation of average values in the absenoe of adequate observat~ons; Ejdrologioal foreoasting; 2. In addition to these projects, WMO is co-operating in the following aotivi- ties of the IHD: Network planning and design; Representative and experimental basins; Floods and their oomputation; Hydrologioal design data for water resources projeots; Hydrological maps; Systems for acquisition, transmission and prooessing of hydrological data; Exohange of information; Improvement, oomparison and standardization of'hydrologioal instruments; Education and training of hydrologists. 3. The following WMO/IBD project reports have been published or are in prooess of being·published: Report No. 1 - Evaluation of atmospheric moisture transport for ~drologioal purposes, by Professor E. Palmen. 60 ANNEX I Report No. 2 - Incidenoe and spread of continental drought, by Dr. V. P. Subrahmanyam. Report No; 3 Estimating areal av~rage preoipitation, by A. F. Rainbird. Report No. 4 World Weather Watoh and its implioations in hydrology -and water resouroes management, by J. P. Bruoe and Professor J. Nemeo. Report No. 5 Radar measurement of precipitation for hydrological purposes, by E. Kessler and K. E. Wilko Report No. 6 - Preparation of oo-ordinated preoipitation, runoff and evapo~ ration maps, by T. J. Nordenson. Report No. 7 Satellite applioations to snow.hydrology, 1968, by R. W. Popham. Report No. 8 Hydrological benoh marks, by W. B. Langbein. Rep<>"t No. 9 Hydrologic requirements for weather radar data, by A. F. Flanders. 4. In order to ensure close co-ordination of action in all the above fields of aotivi ty, no is represented in the following working groups _of the IHD Co-ordinating Councils Global Water Ealanoe; Hydrologic Maps; Representative and Experimental Basins; Influenoe of Man on the HYdrological Cyole; Floods and their Computation; Exchange of Information; Standardization; Eduoation and Training. In addi tion to these working groups, liMO participa,tes in meetings of groups of experts of the IHD ,Seoretariat, which are relevant to WMO activities. 5. A joint WMO/Unesco panel is working on the preparation,~6f a Multilingual In- terdisoiplinar,y Glossar,y for Eydrology. 6. The fourth session of the lHD Co-ordinating Council in May 1968 was presented wi th a report 'on WMO partioipa tion in the lHD. The most important points whioh the Council considered in relation to WMO participation .in the IHD, and on which it· invited 'HMO to take action, are the fol101·ring: (a) WMO has, in the past, provided the technioal seoretariat to an ad hoc Wo-rking Group of IHD on Network Planning and Design whioh considered the problems of ne-twork! planning and design for oonventional elements of the hydrological cycle, suoh as preoi-! pitation, evaporation and streamflow. The working group reoommended that particular attention should be paid in the future to the less-studied elements such as water quality, ANNEX I 61 soil mOisture, sedimentation and groundwater. These elements have been subsequently considered by an IHD/Unesco seoretariat panel of experts, on whioh WMO was also repre sented. The Counoil .Qonsidered that the panel should conoentrate its attention mafnJy on the problem of networks for measurement of groundwater. However, it invited other international organizations to partioipate in the study of the above-mentioned less-con ventional elements and invited WMO to co-operate particularly on studies concerning soil moisture observations. ------World water balanoe WMO has participated in the activities of IHD on this subjeot mainly through the development of methodology for oomputation of hydrometeorologioal elements of the world water balanoe such as preoipitation, evaporation and atmospherio moisture trans port. The Counoil invited WMO to oontinue this participation and disoussed in partiou lar the possibility of preparation of world maps for preoipitation and evaporation. WMO and Unesco were invi ted to consider p088i ble join t pre para tion of such maps be-fo·re the Symposium on World Water Balance which is to be held in Great Britain in 1970. (c) WMO is providing the teohnioal seoretariat and leadership in aspeots of fore oasting concerning runoff, river flow and lake level as well as ioe oonditions and sur face water temperature. The Counoil invited WMO to oontinue to provide the technioal seoretariat in those aspects of foreoasting and expressed the wish that the studies in clude improvement of teohniques for long-range foreoasting. (d) WMO partioipated in the IED_ working group aotivities on this subjeot. The Council invited WMO to oontinue its participation, partioularly on the problems relating to machine prooessing of hydrometeorologioal data, automatio weather stations and as pects of the World Weather Watch, which would imply co-o~eration with IHD. (e) ~th~~~~~~~~~~!~~~~_fo~_~~~~~~~_EE~~~R~!~!io~~_~~!~~!~~_~~~!!~!~ and------snow on the ground The Council disoussed the proposal of WMO for the IHD projeot and fully reoog nized WMO's responsibility to produoe guidanoe material in this field. It suggested that liMO act as the teohnioal secretariat for this projeot and, in particular, oonsider methods to improve the acouracy of measurements. It invited also lASH to provide advioe to WMO if necessary. (r) Publications The Counoil noted with approval the WMO pUblications relating to IHD and re quested WMO to oontinue its publioation activities within the framework of the IHD, in particular the publioation of its reports on WMO/IHD projeots. (g) The Counoil noted with satisfaotion the fruitful oo-operation of WMO and Unesco in the preparation of this glossary of which the first draft has been presented to the Council. It is submitted also to all members of the Commission as well as to all national comm! ttees for IHD, and to other selected speoialists for comments with a yiew to the preparation of a seoond draft. 62 ANNEX I The Counoil not-ad the proposals of WMO for the organization of symposia as recommended by the Executive Committee Panel of Experts on IHD, namely on distribution of precipitation in mountainous areas, and forecasting of runoff resulting from snow and ioe mel t. Mid-Decade inter-governmental conference 7. Considerable attention of the Council was concentrated on the organization, in the second part of 1969, of an international conference on the praotioal results of the IBD and on international co-operation in hydrology. This inter-governmental confer ence is to be convened by Unesco in co~operation with other interested international organizations and it is expected to be held from 6 to 11 October 1969. The conference is to consider three main points: (a) Review of the work aooomplished during the first half of the Decade; (0) Preparation of proposals for future work of the Deoade and for possible changes in direction of the programme; (0 ) Exohange of views on a long-term. plan of aotion in the field of hydrology. WMO will aotively participate in this oonferenoe as deoided by the Exeoutive Committee at its twentieth session. 63 ANNEX II Annex to paragraph 5.1 of the General Summary RECOMMENDATIONS TO WMO OF THE IHD AD HOC WORKING GROUP ON NETWORK PLANNING AND DESIGN Some of the recommendations o~ the IHD ad hoc working group are specifically addressed to WMO. These arel (a) PUblioation of a oase-book oontaining examples of networks in various kinds of geographio and climatio zones throughout the world. These examples would serve as a gUide to developing countries in desigaing their own networks; Efforts towards formulation of reoommendations for optimum periods of record in secondary precipitation networks and for methods of oorrelation with base stations; (e) Efforts towards formulation of recommendations for suitable instruments for precipitation measurement; (d) Research into new or improved methods for SnOl'T surveying; (e) Efforts towards the seleotion of a standard container for evaporation measUD-~ ment, for world-wide use; (f) Development of reasonably cheap, sturdy and sensitive instruments for measup ing net radiation and heat flux through soil and air; (g) Development of meteorologioal and stream-gauging instruments for u~e in tro pical climates. Some other recommendations are also connected with the activities of 1fr\!!O to a limited extent. 64 A l! N E X III Annex to paragraph 11.1 of the General Summary LIST OF lIMO PUBLICATIONS IN THE FIELD OF HYDROMETEOROLOGY PUBLISRED BETWEEN CEY-II AND CEY-III 1. Guide to EYdrometeorological'Practices (~!O -No. l68.TP.82) (English and Spanish) 2. Guide to Meteorological Instrument and Observing Practices (lIMO - No. 8.TP.3) 3. Re~~t of_the second session of the Commission for HYdrometeorology (lIMO - No. 161. RP .59) 4. WMO/ECA Report on major defioienoies in hydrologio data in Afrioa 5. Training of hydrometeorologioal personnel (lIMO - No. 219.TP.116) 6. Proceedings Qf the Third Joint lIMOjECAFE Seminar on Methods of EYdrological Fore casting for the Utilization of Water Resources (UN 'Water Resources Series No. 2'0 7. Prooeedings of the Fourth Joint WMO/ECAFE Seminar on Assessment of the Magnitude and Frequency of Flood Flows (UN Water Resources Series No. 30) ; 8. Instruments and measurements in hydrometeorology - Technioal Note No. 76- (lIMO - No. 191.TP.97) 9. Measurement and estimation of evaporation and evapotranspiration - Teohnical Note No. 83 (liMO - No. 201.TP.I05) 10. The measurement of peak discharge by indirect methods - Te9hnioal Note No. 90 (lIMO - No. 225.TP.119) 11. WMOjIHD Report No. 1 - Evaluation of -atmospherio moisture transport for hydrolo gical pu,rposes 12. lIMO/IHD Report No. 2 - Inoidence and spread of oontinental drought 13. lIMO/= Report No. 3 - Estimating areal average preCipitation 14. lIMO/IHD Report No. 4 - World Weather Watch and its implioations in hydrolOgy and water resources management 15. lIMO/IHD Report No.5 Radar measurement of precipitation for Atdrological purposes 16. lIMO/IHD Report No. 6 Preparation of co-ordinated preoipitation, runoff and evaporation maps. 65 ANNEX IV Annex to paragraph 12.1 of the General Summar,y INFORMATION CONCERNING TECHNICAL ASSISTANCE PROVIDED BY WMO IN THE FIELD OF HYDROMETEOROLOGY Technical assistance projects in hydrometeorologY 1. During the biennium 1967-1968, expert missions in hydrometeorology were in cluded in eight oountries to advise and assist the national Meteorologioal Services in the operation of hydrometeorologioal networks, prooessing and analysis of data and the training of personnel. Two missions (Thailand and Romania) were for the purpose of de veloping operational flood foreoasting while one mission (Cambodia) carried out various analyses of rainfall data needed in oonnexion with the national plans fpr water re sources development and utilization. 2. Under the regional UNDP projects, WMO has since 1965 provided a hydrometeoro logist to the Eoonomic Commission for Latin America to be a member of its ,Water Resour~ Team. Over the years this team has carried out surveys of the existing facilities and the needs in hydrometeorology in various oountries in Latin America and made recommenda tions for their improvement. As & result, three countries (Chile, Ecuador and Peru) carried out, with the assistance of the UNDP (Special Fund), projects for expansion of hydrometeoro1ogical network and facilities, and a project for a similar purpose has just been oommenced in Colombia. 3. Training seminars in hydrometeorology are also organized as projects under the UNDP technical assistance programme. Special Fund projects in ~ydrometeorologY 4. HMO has completed the execution of Special Fund projects in Chile, Ecuador, Peru, Burma and Thailand. In all these projects, networks of hydrometeorological and hydrological stations were established, adequate facilities for collection, prooessing and analysis of data were orea.ted a.nd a good number of na.tionals trained in these fields. In Burma and Thailand flood forecasting on a limited scale was started, while in Peru, in addition to the hydrometeorologioal network and facilities, a hydraulic laboratory was established. 5. The execution of the following Special Fund projects in hydrometeorology was commenced in 1967: Under the project "Expansion and Improvement of Hydrometeorological and Hydro logical Services in the Central America Isthmus", an extensive net~ork (830 hydrometeorological and 270 hydrological stations) and laboratory facilities will be established in Costa Rica, El Salvador, Guatemala, Honduras, Nicara~ and Panama for the collection of basic data required for the· appraisal of water resources. 66 .ANNEX IV The project "Colombian Meteorological and Hydrologioal Services" envisages the establishment of 250 additional meteorological and 150 additional hydro logical atations, and calibration and sediment laboratories and the training abroad of a number of nationals in hydrometeorology. The project "Meteorological Services Development in North-eastern Brazil" in cludes inter alia the development of flood forecasting and warning techniques applicable to that area~ The project "Hydrometeorological Survey of the Catchments of Lakes Victoria, ll Kioga and Albert , in which five countries (Kenya, Sudan, Uganda, United Arab Republic, United Republio of Tanzania) are collaborating, has as its purpose the colleotion and analysis of meteorological and hydrological data of the catchments of the three lakes in order to study the water balance of the Upper Nile basin for planning water conservation and development and to pro vide the groundwork for intergovernmental co-operation in the storage, regu lation and utilization of the Nile waters. 6.. Another Special Fund project, lIEx;pansion of Meteorological and Hydrological Servioes in Mongolia", was approved by the Governing Counoil of the UNDP in January 1968 and its execution was entrusted to WMO. This five-year projeot provides for the strengthening of the hydrometeorologioal and hydrological network in Mongolia, the cre ation of calibration and repair facilities and the training of staff. A number of au tomatic weather stations and a weather radar will also be installed. Training in hydrometeorology 7. In a number of countries which benefit from expert ~issions, the staff of the national Meteorological Services are trained in hydrometeorological work by the experts. Training in hydrometeorology, academic and/or on-the-job, is provided to nationals of a number of- countries by means of fellowships abroad. 8. Proposals are under oonsideration for including training in hydrometeorology in the regional meteorologioal training centres in Lagos (Nigeria) and Nairobi (Kenya), which are at present assisted from regional funds under the UNDP. %¥phoon and flood warning servioes 9. A Special Fund projeot, "Pilot Project for Improvement and Expansion of T,yphoon and Flood Warning Servioes in Taiwan", was commenoed in 1966. With the help of two storm-detecting radar systems and six telemetering raingauge stations installed in the two oritical basins of the countr,y, the behaviour of typhoons and the resulting floods will be studied, and techniques and procedures for an effeotive storm and flood warning system for Taiwan will be developed. 10. WMO and ECAFE jointly organized a survey mission c.omposed of meteorologists and a hydrologist, financed by the UNDP, whioh visited most of the countries in the typhoon area of the Bacific from December 1966 to March 1967, made a comprehensive study of existing facilities for typhoon warning services and formulated a number of signifi oant recommendations. A meeting of experts reviewed the meteorological and flood con trol aspects of the mission1s report in Ootober 1967 and supported its proposals for an improved system to combat the ravages wrought by t.Yphoons. 11. The proposals include improvements in the observing and telecommunications network and the establishment of pilot flood-foreoasting and warning systems in the ANNEX IV 67 countries conoerned. In order to translate these proposals into a programme of action, the area tion of an in tergovemmen tal typhoon commi ttee, similar to the committee for the development of the Mekong, has been recommended. This committee would assist the parti Cipating governments in planning the implementation of meteorological, hydrological and other facilities needed .for improved -typhoon forecasts and warnings and damage preven tion. The creation of a regional typhoon centre to serve as the executive arm of the typhoon commi ttes" 'has· also been recommended. 12. The T,yphoon Committee has been established and its first meeting ismheduled to take place in November 1968. A small joint WMO/ECAFE expert unit is being set up in ECAFE to assist the Typhoon Committee. 68 ANNEX V Annex to paragraph 14.3 of the General Summar,y PROVISIONAL CALENDAR OF SYMIDSIA PLANNED IN THE FRAMEWORK OF THE lED FOR 1968-1974* 1968 8-15 December Symposium on analogue and digital techniques in hydrology (IASHjunesco), Tucson, Arizona, U.S.A. lli2. 6-14 May Symposium on hydrology of deltaic areas in temperate zones (Unesoo/IASEV Romania), Bucharest, Romania. 7-13 September Symposium on hydrology of glaciers (rASH/Unesco/Glaciological Society), Cambridge, U. K~ 17-22 September Symposium on land subsidence (Unesoo/IASH/Japan), Tokyo, Japan. 27 October - Symposium on hydrometry (Unesco/WMO/IASH/Federa1 Repuh1ic of Germany), 1 November Coblenz, Federal Republic of Germany. l21Q 15-23 July Symposium on World Water Balance (Unesco/rASH/WMO/U.K.), Reading, U.K. Date to be Symposium on the results of. investigations in representative and expe fixed rimental areas (IASH/Unesco/New Zealand). Date to be fixed Hydrogeochemistry and biochemistry (IAGC/Unesco/IASH/Japan). 1970-1974 Distribution of precipitation in mountainous areas (WMO). 1970-1974 Forecasting of runoff resulting from snow and ice melt (WMO). 1111. Symposium on environmental and inter-disciplinary studies of glaciers, and of snow in mountain regions (LASH/Unesco, Moscow (during XVth General Assembly of the ruGG)). * Eased on information available in the WMO Secretariat September 1968. 69 ANN E X VI Annex to paragraph 17 of the General Summary PREVIOUS RECOMMENDATION OF THE COMMISSION KEPT IN FORCE Reo. 5 (CRy-II) - COLLABORATION WITH THE UNITED NATIONS AND ITS REGIONAL ECONOMIC COM MISSIONS THE COMMISSION FOR HYDROMETEOROLOGY, NOTING that the Seoretary-General through the inter-agenoy meetings of the United Nations and its specialized agencies is currently aware of the activities related to hydrOmeteorology of the other agencies and, in partioular, of surveys on water needs and resources and of surveys on physioal and economio data of river basins or ground water reservoirs extending across sever~l oountries, RECOMMENDS that the Seoretary-General be requested to oontaot, prior to each survey, the United Nations and the regional eoonomic commission concerned and 10 draw attention to the following points: (1) The desirability that the teams entrusted with the survey include ex perts with the neoessary knowledge of hydrology as well as of meteorology; (2) The neoessity of full co-operation between international survey teams and the national Services, so that analyses of climatological and hydrological data and maps, prepared by the survey teams, are made in such a y~ that they can be used by the national S~lrvices for their current and planned studies; (3) The desirability of taking appropriate measures to ensure that after the conolusion of the United Nations experts' misSion, hydrological and meteorological sta tions installed as a result of the mission are taken over in whole or in part by nation al Servioes, in order to improve the previously existing network. 70 LIST OF DOCUMENTS I. "Doc 1/ series Doc. Agenda Title Submitted by No. item 1 Agenda 2.2 Rev. 1 2 Explanatory memorandum concerning the 2.2 provisional agenda Add. 1 3 World Water Balance and representative 6.2 Chai rman of the and experimental basins working group Report of the Working Group on Representa tive and Experimenta~ Basins 4 Establishment of working groups 16 Seoretsr,y-General 5 Report by the president of the Commission 3 President .of' CRy Add. 1 6 Training seminars in hydrometeorology 10.3 Seoretar,y-General 7 IHD project on hydrologioal forecasting 7.2 Secretar,y-Gen~ral 8 WMO-CBj Working Group on Machine 9.2 Chairman of the Processing of Ejdrometeorological Data working group 9 Re~ort on organization of existing hydro 5.2 Secretar,y-General logical and hydrometeorologioal services 10 Water information systems 9.3 Secretary-General 11 Hydrological design data for water 8.3 Seoretar,y-General resources projects 12 lED programme in education and training 10.2 Secretar,y-General in hydrology and ¥MO co-operation 13 Methodology of World Water Balanoe studies 6.1 Secretar,y-General 14 Improvement, comparison and standardization 4.4 Secretary-General of hydrological instruments and techniques 15 General guidance material and stan~rdiza 4.2 CBj representative tion on the ClMO work- ing group LIST OF DOCUMENTS 71 Agenda Doo. Title Submitted by No. item 15 Report of the CRy representative on the CRy representative elMO Working Group on the Measurement on the CIMO work of Precipitation ing group 16 General guidanoe material and standar CRy representative dization on the ClMO work ing group Report of the CEY representative on the CIMO Working Group on Evaporation Measuremen t 17 General guidanoe material and standar Chairman of the dization working group Report of the chairman of the CRy Working Group on Water Levels and Disoharge Measure ment and Estimation 18 Publications, terminology, universal 11.3 Chairman of the deoimal classifioation working group Report of the CRy Working Group on Universal Deoimal Classification 19 Eduoation and training 10.1 Chairman of the working group Report of the CRY Working Group on Training in HYdrometeorology 20 Hydrological forecasting CSM rappo rteur Meteorological foreoasts for hydro logical purposes 21 Co-operation with other inter 14 Secretary-General national organizations 22 Aotivities of the Exeoutive Committee 3 Seoretary-General Panel of Experts for the International HYdrological Decade Add. 1 23 Publioations, terminology, universal 11.2 Chairm~n of the decimal olassification in hydrology working group Report of the Chairman of the CRy Working Group on Terminology 24 Hydrological forecasting 7.5 Seoretary-General Avalanche warnings 25 Guide and Teohnioal Regulations Seoretary-General Teohnical Regulations in Hydrometeorology 72 LIST OF DOCUMENTS Agenda Doc. Ti tIe Submitted by No. item 26 Teohnioal assistanoe and related 12.1 Seoretary-General projects 27 Methodology of World Water Balanoe studies 6.1 C~ representative on the Cel working Report on activities of the COl Working group Group on Climatio Atlases 28 Network design Seoretary-General 29 General guidanoe material and CRy representative standardization on the CAgM work ing group Report of the Clly representative on the CAgM Working Group on Practioal Soil Moisture Problems in Agriculture 30 General guidanoe material and standard SeoTetary-General ization Prqposed revisions to the Guide to EYdrometeorological Practioes App. A, Corr. 1 31 Co-operation with other international 14.3 Secretary-General organizations and symposia Add. 1 App. A, Rev. 1 App. B, Rev. 2 32 Hydrological design for water resouroes 8.1 Chairman of the projeots working group Report of the ohairman of the Clly Working Group on Estimation of Maximum Floods 33 Review of resolutions and reoommendations Seoretar.y-General of CBY-III and the Executive Committee 34 General guidance material and standard Secretary-General ization Amendments to the Technioal Regulations 35 Co-operation with other international 14.2 Secretar,y-General organizations and symposia Regional co-operation 36 WMC/IHD reports and other publications 11.1 Seoretar.y-General Add. 1 37 Report of the CBY Working Group on the Cha.irman of the Guide and Technical Regulations working group LIST OF DOCUMENTS 73 Doo. Agenda Ti tIe Submi tted by No. item 38 Report of the CHY Working Group on the Secretar,y-General HYdrometeorological Aspects of the World Weather Watch 39 Resolutions of the IHD Co-ordinating 3, 6.1 Secretar,y-General Counoil referred to in Cay-III documents 7. 2, 9.3 40 Report of the Working Group on HYdro Chairman of the meteorological Instruments and Methods wo rking group of Observation 41 The lED Mid-Decade Conference and needs 14.4 Presiden t of CHY and possibilities for a long-term plan of action in the field of hydrology 42 Report of the CHY Working Group on 7.1 Seoretar,y-General HYdrological Forecasting 43 Wind set-up and seiches 7.3 Seoretary-General 44 HYdrological foreoasting 7.5 Seoretar,y-General Avalanohe warnings 45 Report of the CHY Working Group 7.1 Chairman of the on HYdrological Forecasting working group 46 Artifioial rainfall 13.1 Secretary-General 47 Influence of freshwater discharge on 2.2 Delegation of salinity of tidal streams and the measure Guyana ment and prediction of distribution of salinity in these streams 48 Regional co-operation Chairman of the RA VI Working Co-operation with other international Group on HYdro organizations and symposia me teorology 49 HYdrology in FAO 14·1 Mr. H. W. Underhill FAO 50 Evaporation 10ss6s from lakes and India reservoirs 51 Storm distribution for short durations India 52 Evaporation losses from lakes and Israel reservoirs Evaporation data of Class A pan as indioa tor of the yearly maroh of evaporation from larger reservoirs 74 LIST OF DOCUMENTS Doc. Agenda Ti Ue Submitted by No. item 53 Unesco aotivities in the field of 14.1 Representative hydrology of Unesco 54 Optimization of meteorological-hydro 14.4 Delegate of logical organization within the specialized Guyana agenoies of the United Nations 55 Avalanche warnings 7.5 Italy II. "Pink" series 1 Report to Plenary by Committee A on Chairman of agenda item 7.4 - Meteorologioal fore Committee A oasts for hydrologioal purposes 2 Report to Plenary by Committee A on 12.1 Chairman of agenda item 12.1 - Teohnioal assistanoe Committee A Rev. 1 3 Report to Plenary by Committee A on Chairman of agenda item 8.4 - TYphoon damage control Committee A projeot 4 Report to Plenary by Committee A on Chaiman of agenda item 7.3 - Wind set-up and seiohes Committee A 5 Report to Plenary by Committee B on Chairman of agenda item 5.1 - Symposium on Network Committee 13 Design and subsequent aotivities 6 Report to Plenary by Committee A On Chairma.n of agenda item 9.2 - Machine prooessing of Committee A hydrometearologioal data 7 Report to Plenar,y by Committee A on 12.2 Chairman of agenda item 12.2 - Water resources oon Committee A sul tan t team 8 Report to Plenar,y by Committee B on 6.1 Chairman' of agenda item 6.1 - World Water Balance Commi ttee B 9 Report to Plenar,r by Committee E on Chairman of agenda item 5.2 - Organiza.tion of national Committee 13 Hydrologioal and Hydrometeorologioal Services 10 Report to Plenar,r of the lIorking Group on 16 Chairman of the Advisor,y Working Groups Working Group on the Constitution Establishment of a working group to advise of the Advisor,r the president Working Group of CHy LIST OF DOCUMENTS 75 Doc. Agenda Ti tle Submitted by No. item 11 Report to Plenary by Committee A on 13.1 Chairman of agenda item 13.1 - Artificial rainfall Committee A 12 Report to Plenar,y by Committee E on 10.2 Chairman of agenda item 10.2 - Co-operation with Committee B the Co-ordinating Council for IHD in hydrological education and training 13 Report to Plenary by Committee Bon 8.1 Chai man of agenda item 8.1 - Estimation of maxi Committee B mum -floods 14 Report to Plenar,y by Committee Bon 10.3 Chairman of agenda item 10.3 - Training seminars Committee B 15 Report to Plenary by Committee] on Chairman of agenda item 7.1 - Working Group on Committee B Ejdrological Forecasting 16 Report to Plenary by Committee Bon Chairman of agenda item 7.2 - Australian symposium Committee B and related WMO activities in hydro~ logical forecasting 17 Report to Plenar,y by Committee Bon 8.2 Chairman of agenda item 8.2 - Technioal Note on Committee B depth-are a-duration of Tainfall 18 Report to Plenary by Committee B on 8.3 Chairman of agenda item 8.3 - Hydrological design Committee B data for water resources projects 19 Report to Plenar,y by Committee Bon 10.1 Chairman of agenda item 10.1 - Guidance material Committee B and report on training of hydrometeo rological personnel 20 Report to Plenary by Committee A on 4.6 Chairman of agenda item 4.6 - Influenoe of fresh Committee A water discharge on salinity of tidal streams 21 Report to P1enar,y by Committee B on 1l.2 Chairman of agenda item 11.2 - lYMO/Unesco .Joint Committee B Project on Terminology 22 Report to Plenary by Committee] on 11.3 Chairman of agenda item 11-.J - Universal decimal COIIl:mittee B classification in ~drology 76 LIST OF DOCUMENTS Doo. Agenda Ti tIe Submitted by No. item 23 Report to Plenar,y- by Commi ttee A on Chairman of agenda item 4.1 - Guide to Ejdrometeo Commi ttee A rological Practices and Technical Regulations in hydrometeorology 24 Report to 'Plenary by Committee A on 4.3 Chairman of agenda item 4.3 - Water level and Committee A discharge measurement 25 Report to Plenary by Committee A on Chairman of agenda item 9.1 ~ HYdrometeorologioal Commi ttee A aspects of the World Weather Watoh 26 Report to Plenary by Committee A on 13.2 Chairman of agenda item 13.2 - Continental drought Committee A 27 Report to Plenary by Committee A on 4·5 Chairman of agenda item 4.5 - Evaporation losses Commi ttee A from lakes and reservoirs 28 Report to Plenary by Committee B on 14.2 Chairman of &genda item 14.2 - Regional co-operation Committee B 29 Report to Plenary b.Y Committee Bon Chairman of agenda item 7.5 - Avalanche war.nings Committee ::B 30 Report to Plenary by Committee A on Chairman of agenda item 8.5 - Storm distribution Committee A for short durations 31 Report to Plenary by Committee A on 9.3 Chairman of agenda item 9.3 - Water information sys Committee A tems and related IED projects 32 Report to Plenary by Committee B on Chairman of agenda item 14.1 - Co-operation with the Committee ::B IBD Secretariat and other international o rganiza tions 33 Report to Plenary by Committee B on Chairman of agenda item 14.3 - Symposia Committee B 34 Report to Plenar,r by Committee B on 6.2 Chairman of agenda item 6.2 - Representative and Committee ::B experimental basins 35 Report to Plenary by Committee B on ll.l Chairman of agenda item 11.1 - WMO/IED reports Committee B and other publications LIST OF DOCUMENTS 77 Doo. Title Agenda Submi t ted by No. item Report to Plenary by Committee A on Chairman of agenda item 4.4 - Improvement, comparison Committee A and standardization of hydrologioal ins truments and techniques 37 Report to Plenary on agenda item 2 - 2 Representative of Organization of the session Secretary-General Report to Plenary on agenda item 1 - 1 Representative of Opening of the session Seoretary-General 39 Report to Plenary on agenda item 15 15 Representative of Scientific leotures and discussions Secretary-General Report to Plenary by Committee A on 4.2 Chairman of agenda item 4.2 - Instruments and Committee A methods of observation 41 Report to Plenary by Committee Bon 3 Chairman of agenda item 3 - Report by the president Commi ttes B of the Commission 42 Report to Plenary by Committee Bon 14.4 Chairman of agenda item 14.4 - IHD Mid-Decade Conference Committee of the Add. 1 Whole 43 Report tQ Plenary on agenda item 16 - 16 Representative of Establishment of working groups Secretary-General