ABSTRACT Water management, among other things deals with a very important component - Hydrological and Meteorological data which define the conditions for available water resources to national or regional demands. The matching of the balance of water resources and needs, as well as the planning and implementation of appropriate measures to provide the necessary water supply for the basin have become question of high priority. This report explains the methods and processes used in Hydrometeorological data collection of different data types. The analysis shows the difficulties encountered during the collection of these hydrometeorological data and the reasons why some hydrometeorological data weren’t available. A relevant improvement of hydrological methods is needed to understand that this topic is of considerable interest to hydrological services. Taking all this into account, it is generally recognized that hydrometeorological data and well planned hydrological networks are prerequisites for efficient and sound water resources planning.