Following 1991-1992 winter severe flooding events in the Haifa Bay area, in which 500 hectares of residential, industrial and agricultural areas were flooded, the Kishon River drainage authority and Yodfat Engineers promoted the implementation of hydrological study, river regulation works, small river dredging works and controlled closed disposal of sediments ( long distance ) - first time in Israel , construction of protection embankments, culverts , bridges and flexible backflow prevention devices (Tideflex - first time in Israel ).