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© 1973, World Meteorological OrganizationNOTEThe designations employed and the presentation of the material in this publication do notimply the expression of any opinion whatsoever on the part of the Secretariat of the WorldMeteorological Organization concerning the legal statns of RUy country or territory or of itsauthorities, or concerning the delimitation of its frontier.s.
CONTENTSFOREWORDSUMMARY..................................................................(English, French, Russian, Spanish)•.......................•.....VVIICHAPTER 1 AUTOMATION OF HYDROLOGICAL OBSERVING STATIONS••••••••••••••••• 11.11.21.2.11.2.21.31.3.11.3.21.3.31.3.41.3.51.3.61.3.71.41.4.11.4.21.4.31.5Introduction.....••..•............•..•....•...........•• 0·•••••••••Reasons for introducing automation••••••••.••••..••.•••.•••..•....Adequacy af present data collection programme •••••••••••••••••••••Manual versus automatic.........................................•.Factors affecting choice of instruments and type of installationfor automatic hydrological observing stations••••.•.•..•....•.••••Local conditions.•......•........•................•...............Sources of power........•.•.......................................Accuracy requirements•..•.•.......................................Proposed life of station.............•..•...................•••...Maintenance....•..•..................................•...•..••....Transmission requirements.•.......................................Treatment of data..........•......................................Selection of instruments............•.............•...............Network design .Aids for selection of instruments .Questionnaire on instruments of proven reliability .Special considerations .12224577889101010101111CHAPTER 2 TRANSMISSION OF HYDROLOGICAL OBSERVATIONS•..••.......•..••..•• 132.12.22.32.42.4.12.4.2Introduction .Systems of data transmission .General considerations in selection of systems .Transmission links.........•......................................Dedicated land lines .Commercial telephone lines .131316171718
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ANN E X 1QUESTIONNAIRE ON HYDROMETE
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