HIGH RISK HYDROLOGICAL PHENOMENA, THE FLOODS IN THE NIRAJ BASIN
Daniel Raduly
ABSTRACT – High risk hydrological phenomena, the Floods in the Niraj Basin. Since the beginning of time, people have wanted to know the threats they should protect themselves from, or the opportunities they should exploit in order to be closer to nature. For a long time, the Niraj Valley has been confronted with the danger of flooding which, usually in spring, threaten the houses, lives and activity of the people in the area. In order to protect the settlements on the Niraj valley from flooding, in 1988 the investment ”Hydrotechnical improvements in the Niraj Hydrologic Basin, Mureș county” was promoted. It consisted mainly of the following:
§ Making the nonpermanent accumulation Valea on Nirajul Mare river
§ Recalibrating the Vețca channel in order to receive the full flows of Nirajul Mic river and of its own affluents.
§ Arranging the course of the Niraj river between MiercureaNirajului and Unghenii in order to ensure the transition of the water flow with a 5% insurance, and the protection of areas with active erosion.
The moving forward of the work has experienced fast evolution as well as slow pace or even stagnation. However, it is certain that asfter 1999, when work was resumed, the number of dangerous floods was considerably reduced, as we shall see in ths article.
Keywords: hydrological risk, hazard, vulnerability, frequency, flood, flood hydrograph.
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