Evros River Flood Lavara Case Study

Transcription

1 Evros River Flood Lavara Case Study Chouvardas Konstantinos (Coordinator) Papapostolou Christos Chamitidou Maria Partsias Christos Doulgeraki Chrisoula Paschali Stauroula Karanika Chrisoula Kokovinos Konstantinos Koujianos Ioannis

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3 Case Study Area Regional Unit of Evros

4 Case Study Area Proposed Case Study Area limits Flood Hazard Zone Embankment Evros River

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6 Authorities responsible for Flood Management. In National Level: Ministry of Environment and Energy Special Secretariat for Water. Ministry of Infrastructure, Transport and Networks Directorate of Flood Management and Land Reclamation Works. Ministry of Interior General Secretariat of Civil Protection. In Regional Level: Region of Eastern Macedonia and Thrace Regional Unit of Evros. Infrastructure authorities. Civil Protection authorities. Municipality of Soufli. Infrastructure authorities. Civil Protection authorities. Local Police and Fire Departments.

7 Main causes of flooding in Case Study Area: Evros River flooding. Stormwater flooding from streams vertical to Evros River.

8 Evros River Mandra Stream

9 Lagina area flood 2010 Mandra area flood 2010 Pragi area flood 2010 Lavara area flood 2010

10 Bund break (caused by the water pressure) Bund break (caused by the water pressure) Bund break (caused by human intervention) Bund break (caused by human intervention)

11 2005

12 2005

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15 Flood History in the Study Area: Local District Population (2011) Number of flood events ( ) Amorio Lavara Mandra No human casualties Important Flood Events ( ): Event Date Local District Damaged Area (m ) Compensation ( ) 17/05/1998 Lavara ,00 01/05/2006 Amorio ,00 01/05/2006 Lavara ,00

16 Primary sectors affected by flood events: Agriculture. Livestock. Trade and Business. Transport Infrastructure. Properties (Public and Private). No archeological sites & monuments in Case Study Area. Damaged pump station Flooded area

17 Damages of Crops of the Lavara Area Year Area of SqrKhm Crop Cereals, Clover Cereals, Clover Cereals,Clover Cereals Cotton Sunflower Corn Clover Cereals Clover Cotton Corn Cereals, Clover Clover, Cereals

18 Evros River: Basin Area: km 2 66,2% in Bulgaria 27,5% in Turkey 6,3% in Greece River Length: 528 km Estimated flow (annual average): 103 m 3 /s

19 Copernicus Program flooded area satellite recordings

20 Flood Hazard Map by Return Period of 20 years

21 Flood Hazard Map by Return Period of 50 years

22 Flood Hazard Map by Return Period of 100 years

23 Flood Hazard Map by Return Period of 1000 years

24 Flood Depth per Return Period alongside the Railway and National Road Embankments Return Periods (years) Flood Depths alongside the Railway Embankment (m) > > >2.00

25 Current Flooding Situation - Damage estimations per Return Period Damage in buildings Return Periods (years) Residential Properties Non Residential Properties Damage in cultivated areas Return Periods (years) Area (ha)

26 Proposed flood protection interventions: 1. Closing of 3 National Road and Railway overpasses 2. Enhancing of the main by-pass channel in the irrigation network 3. Enhancing of the river s main embankment

27 1. Closing of 3 National Road and Railway overpasses: I. Overpass protection (2 Alternative Designs) II. Arrangement of the existing flood protection and drainage infrastructure Alternative A: Extended berms No land redistribution Construction of 3 berms Height: 4.00m Road Grade: ±7% Costs Value ( ) Capital Costs 300,000 Maintenance Costs 3,000 Total Costs 303,000 Alternative B: Shorter berms Land redistribution - expropriations

28 2. Closing of 3 National Road and Railway overpasses AND Enhancing of the main by-pass channel in the irrigation network Length: 12km Indicative depth: 3.00m Indicative bed width: 3.00m Indicative slope: 2:3 Costs Value ( ) Capital Costs 1,300,000 Maintenance Costs 13,000 Total Costs 1,313,000

29 3. Closing of 3 National Road and Railway overpasses AND Enhancing of the main by-pass channel in the irrigation network AND Enhancing of the river s main embankment Length: 16km Existing height: 3.00m Proposed height: 5.00m Proposed crest width: 6.00m Indicative slope: 2:3 Costs Value ( ) Capital Costs 2,600,000 Maintenance Costs 26,000 Total Costs 2,626,000

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31 Current flooding situation: Discounted future potential losses: approx. 61,500,000 After Closing the 3 National Road and Railway overpasses: Total Cost: 303,000 Discounted future potential losses: approx. 855,000 Benefit: approx. 60,625,000 After Closing of 3 National Road and Railway overpasses AND Enhancing of the main by-pass channel in the irrigation network: Total Cost: 1,313,000 Discounted future potential losses: approx Benefit: approx. 60,915,000 After Closing of 3 National Road and Railway overpasses AND Enhancing of the main by-pass channel in the irrigation network AND Enhancing of the river s main embankment: Total Cost: 2,626,000 Discounted future potential losses: ø Benefit: approx. 61,500,000

32 CBA RESULTS Options (Repeated) Benefit : Cost ratio Benefit:cost ratios 1. Closing road and rail gaps Closing road and rail gaps AND Enhanced bypass channel in floodplain Closing road and rail gaps AND Enhanced bypass channel in floodplain AND Enhanced main river embankments Closing road and rail gaps 2. Closing road and rail gaps AND Enhanced bypass channel in floodplain 3. Closing road and rail gaps AND Enhanced bypass channel in floodplain AND Enhanced main river embankments

33 Thank you for your attention.