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DSS for operation of the lateral reservoirs during flood periods Radu Drobot, Aurelian Florentin Draghia - Abstract On the lower Danube (downstream Iron Gates) the river banks on the Romanian side are protected by dykes on a length of 1100 km. Different towns along the Danube River, like Giurgiu, Oltenita, Calarasi, Braila and Galati are still threatened by floods close to or higher than 1% probability of exceedance. The floodplain is divided by transverse dykes into agricultural zones which could be used as polders for storing water during high floods. A Decision Support Tool (DST) was developed by UTCB in order to evaluate the hydraulic consequences (water level, maximum discharge) for different scenarios of polders accidental or deliberate flooding. A special sub-model for breach development (breach elevation and length evolution) was set up. Since the hydraulic simulations are time and other resources consuming, a hydrological model for flood propagation was used. After parameters calibration and validation, based on registered exceptional floods in 2006 and 2010 different scenarios of polders inundation were tested. 1. Introduction At the end of XIX th and beginning of XX th century land reclamation works started in the Danube meadow and especially in the river Delta. The first embankments were realized at Mahmudia (467 ha) in 1895 (Dithmer and Langerweld) and Chirnogi (1058 ha) in 1904 (Scharm, Dithmer and Langerweld). The latest

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DSS for operation of the lateral reservoirs during flood periodsRadu Drobot, Aurelian Florentin Draghia -AbstractOn the lower Danube (downstream Iron Gates) the river banks on the Romanian side are proteted b!d!kes onalengtho" ##$$km%Di""erent towns alongtheDanubeRiver, likeGiurgiu, Oltenita,&alarasi, 'railaandGalatiarestill threatenedb!"loodslosetoorhigherthan#(probabilit!o"e)eedane% *he "loodplain is divided b! transverse d!kes into agriultural +ones whih ould be usedas polders "or storing water during high "loods% ADeision ,upport *ool (D,*) was developed b!-*&'in order to evaluate the h!draulionse.uenes (water level, ma)imumdisharge) "or di""erent senarios o" polders aidental ordeliberate "looding% Aspeial sub-model "or breah development (breah elevation and lengthevolution) was set up% Since the hydraulic simulations are time and other resources consuming, ahydrological model for flood propagation was used% A"ter parameters alibration and validation, basedonregisterede)eptional "loodsin/$$0and/$#$di""erent senarioso" poldersinundationweretested%1. IntroductionAttheendo"1I1thandbeginningo"11thentur!landrelamationworksstartedintheDanube meadow and espeiall! in the river Delta% *he "irst embankments were reali+ed at2ahmudia(304ha)in#567(Dithmer and8angerweld) and&hirnogi (#$75ha) in#6$3(,harm, Dithmer and 8angerweld)% *he latest relamations date "rom#657, the totalproteted area reahing almost 967%$$$ ha% A number o" 93 enlosures were reali+ed all alongthe Danube (Fig% #)%In natural regime, the meadow had a retention apait! evaluated at /$%9 billion m9%A"ter theembankments reali+ationaninreaseo"more than#m o" thewater levelomparedtothenatural regimeoursin'railaandGalati townduring"loodsloseto#(probabilit!o"e)eedane%'eside'railaandGalati thereareothertownsalongtheDanubeRiver,likeGiurgiu, Oltenitaand&alarasiwhiharethreatenedb!"loodslosetoorhigherthan#(probabilit! o" e)eedane%Fig% #% :nlosures along the Danube River on the Romanian territor!Galati area has a speial situation, being loated between the on"luenes o" two importanttributaries; ,iret River (upstream Galati town) and