INHGA - Proiect Cheia

The flood is a phenomenon of rapid and significant increase and decrease of discharges and levels of a water course, and the flash flood has an increase time of maximum 6 hours.

The warning system in case of floods has at its basis the hydrological forecast established within the NIHWM. In the case of catchments with small reception surfaces (F<100 – 200 km 2 ) the response time to rainfall is very short (in the order of 15 minutes to several hours), which makes impossible the use of hydrological modeling.

The ensuring of real time imposes a rapid evaluation of precipitations supplied by automated stations, radar information and the comparison of these precipitation values with different critical precipitation thresholds associated with preset defense (or risk) gage heights.

The link between precipitation thresholds, which lead to the reaching/exceeding of defense gage heights in the sections that control small basins with torrential regime can be established on the basis of the correlation between the characteristics of floods with its triggering factors.

On the basis of the correlations, there can be pre-established thresholds of the characteristics of precipitations (quantity, duration, etc.), which can start flash floods. At the moment of the forecast or recording in operative of these preset values, there can be immediately emitted warnings to the decision-makers, who can make estimations regarding the gravity and the risk of the event.

he advantage of the method is both the shortening of the emitting time (immediately after the recording of the rainfall), and the fact that the information from a single pluviometric station can be used as warning information for a larger area (for which it is representative) and which can cover the basin surface of several rivers.
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