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Delimitation and codification of hydrographic units through the use of geographic information systems

Abstract:

Geographic Information Systems (GIS) provide new methods and tools for automatic data processing, which are used by organizations to improve process management. The basin is considered as the basic unit of territorial planification, for which the hydrographic units delimitation is the key for water resources administration. The lack of detail in basins geographical information has to be solved, in order to optimize the decision-making process and related tasks. Using the Pfafstetter methodology, the Jubones river basin was subdivided into level 6. For this purpose, we used the level 5 hydrographic units, the SRTM spatial resolution data model of 30 m and GIS software. At level 5, 13943, 13944, 13945, 13947, 13948 and 13949 hydrographic units were identified. In accordance with the selected method guidelines, 9 drainage areas were coded for each hydrographic level 5 unit. 54 hydrographic units at level 6, of which 30 correspond to inter-basins and 24 to basins, thus updating the geographical information. The total subdivided area was 312,223.06 ha. It is important to replicate the research in other basins and publish the results using the Spatial Data Infrastructure (SDI) platforms.