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ReSAC successfully fulfilled a project for mapping flood risk and flood hazard for East-Aegean River Basin Directorate, Bulgaria

Remote Sensing Application Center – ReSAC, Bulgaria in a consortium with other organizations finished the project for Mapping flood hazard and flood risk in East Aegean River Basin Directorate (EARBD) in Bulgaria.

The project was a second step in implementation of the Flood Risk Directive in Bulgaria, namely preparation of the flood hazard and risk maps.

The project was focused on analyzing 31 areas with significant potential flood risk with a total length of 1078 km. in the rivers and 19 reservoirs for which a scenario for dam break and dam overflow was modeled.

The territory of the EARBD is almost 1/3 from the territory of Bulgaria. The second largest river in the country flows here – Maritsa River which is a transboundary river for Bulgaria, Turkey and Greece. The other important rivers also transboundary are Arda River, which takes the water from the East Rhodopy Mountain and Tundzha River – both of them tributaries to Maritsa.

For very short time frame from the beginning of May 2015 the project consortium performed activities on preparatory actions for analysing the areas with significant flood risk, more than 2000 cross section measurements, hydraulic (1D and 2D) and hydrologic modeling in order to assess the flood hazard.

ReSAC was involved in the aforementioned steps supporting the consortium with GIS analyses, cross section distribution, data processing for modeling, preparation of DEM from topographic maps in scale 1:5 000 and cadaster information.

The main responsibility of ReSAC was focused on assessing the flood risk within the 31 areas of the project. National data for population, economic infrastructure, land use, cadaster, critical infrastructite, cultural heritage, protected areas etc. were processed in a way to allow assessing the flood risk in accordance to the Flood Risk Directive of the EU.

As a result of the project more than 5300 maps in scale 1:10 000 and 1: 5 000 for flood hazard and flood risk were produced and delivered to the East Aegean River Basin Directorate and to the stake holders and interested users.
ReSAC was also responsible for preparation all the GIS databases containing the in-situ data, source data and final project results databases. ReSAC produced the database which the River Basin Directorate will directly report to the EC in relation to the Directive together with the GIS layers to be integrated in WISE.

Example of flood hazard map

Example of flood hazard velocity map

Example of flood risk map

The project was a continuation of the activities and professional expertise ReSAC provides to the specialized governmental authorities in the past several years related with disaster management and especially these related with the Flood Risk Directive. ReSAC as a center of excellence supports the Ministry of Environment and River Basin Directorates in the implementation of the Directive since 2011 with the Preliminary Flood Hazard and Risk Assessment for Danube Region River Basin Directorates (DRRBD), in 2012 with the Determination of the Areas with Significant Potential Flood Risk for DRRBD and participation in the Danube FloodRisk Project with preparation of Flood Hazard and Risk Maps for Bulgarian Sector of Danube River and training of the local users and stakeholders.

For more information

Remote Sensing Application Center (ReSAC)
61, Tzar Assen Str., fl. 2, 1463, Sofia, Bulgaria. Tel: +35929800731 / Fax: +35929818216.