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
Case Study Area Regional Unit of Evros
Case Study Area Proposed Case Study Area limits Flood Hazard Zone Embankment Evros River
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.
Main causes of flooding in Case Study Area: Evros River flooding. Stormwater flooding from streams vertical to Evros River.
Evros River Mandra Stream
Lagina area flood 2010 Mandra area flood 2010 Pragi area flood 2010 Lavara area flood 2010
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)
2005
2005
Flood History in the Study Area: Local District Population (2011) Number of flood events (1986 2012) Amorio 412 10 Lavara 1.093 17 Mandra 150 6 No human casualties Important Flood Events (1986 2012): Event Date Local District Damaged Area (m 2 10 3 ) Compensation ( ) 17/05/1998 Lavara 5.783 370.000,00 01/05/2006 Amorio 2.075 240.000,00 01/05/2006 Lavara 6.478 570.000,00
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
Damages of Crops of the Lavara Area Year Area of SqrKhm Crop 2005 13500 Cereals, Clover 2006 9000 Cereals, Clover 2010 4.570 Cereals,Clover 2012 6.170 Cereals Cotton Sunflower Corn Clover 2013 1.170 Cereals Clover 2014 1.120 Cotton Corn 2015 350 Cereals, Clover 2016 1.000 Clover, Cereals
Evros River: Basin Area: 53.000 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
Copernicus Program flooded area satellite recordings
Flood Hazard Map by Return Period of 20 years
Flood Hazard Map by Return Period of 50 years
Flood Hazard Map by Return Period of 100 years
Flood Hazard Map by Return Period of 1000 years
Flood Depth per Return Period alongside the Railway and National Road Embankments Return Periods (years) Flood Depths alongside the Railway Embankment (m) 2 0.75-1.25 20 1.75-2.00 50 >2.00 100 >2.00 1000 >2.00
Current Flooding Situation - Damage estimations per Return Period Damage in buildings Return Periods (years) Residential Properties Non Residential Properties 2 20 5 20 250 40 50 300 40 100 380 60 1000 380 60 Damage in cultivated areas Return Periods (years) Area (ha) 2 120 20 277 50 1.200 100 1.240 1000 1.380
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
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
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
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
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. 566.000 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
CBA RESULTS Options (Repeated) Benefit : Cost ratio 250.00 200.00 Benefit:cost ratios 1. Closing road and rail gaps 200.08 150.00 100.00 2. Closing road and rail gaps AND Enhanced bypass channel in floodplain 37.69 50.00 3. Closing road and rail gaps AND Enhanced bypass channel in floodplain AND Enhanced main river embankments 14.49 0.00 1. 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
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