Frisco 1 Technical Support for the Preparation of the Cross-Border Coordinated Comprehensive Flood Protection Study for the Drava River Basin
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HRVATSKE VODE Cross-border cooperation Pravna osoba za upravljanje vodama for flood risk reduction ZAGREB, Ulica grada Vukovara 220 THE COOPERATION PROGRAMME INTERREG V-A CROATIA SLOVENIA 2014-2020 PROJECT: FRISCO 1 TECHNICAL SUPPORT FOR THE PREPARATION OF THE CROSS-BORDER COORDINATED COMPREHENSIVE FLOOD PROTECTION STUDY FOR THE DRAVA RIVER BASIN STUDY: CROSS-BORDER COORDINATED COMPREHENSIVE FLOOD PROTECTION STUDY FOR THE DRAVA RIVER BASIN FEASIBILITY STUDY SUMMARY PREPARED BY: CONSORTIUM: HIDROING d.o.o. OSIJEK - leading partner GRAĐEVINSKI FAKULTET SVEUČILIŠTA U ZAGREBU VODNO-GOSPODARSKI BIRO MARIBOR d.o.o. EXTERNUS CONSULTING d.o.o. HIDROKONZALT PROJEKTIRANJE d.o.o. VODOPRIVREDNO PROJEKTNI BIRO d.d. Contracting authority: HRVATSKE VODE Zagreb, Ulica grada Vukovara 220 Project number I-1789/17 Prepared by: HIDROING d.o.o. Osijek CROSS-BORDER COORDINATED COMPREHENSIVE FLOOD PROTECTION STUDY FOR THE DRAVA RIVER BASIN FEASIBILITY STUDY SUMMARY EXECUTIVE: Vjekoslav Abičić, mag.oec. Zagreb, March 2019. THE STUDY DOCUMENTATION IS PREPARED BY FOLLOWING EXPERTS: STUDY TEAM LEADER: Zdenko Tadić, dipl. ing. građ. - HIDROING STUDY DEPUTY TEAM LEADER: Diana Šustić, dipl. ing. građ. - HIDROING EXPERT TEAM: Mr.sc. Antonija Barišić-Lasović, dipl.ing. – environmental aspects- HIDROING Doc.dr.sc. Damir Bekić - GRAĐEVINSKI FAKULTET SVEUČILIŠTA U ZAGREBU Mag. Smiljan Juvan, udig - VODNOGOSPODARSKI BIRO MARIBOR Tijana Mičić, udig - VODNOGOSPODARSKI BIRO MARIBOR Mate Soža, dipl. oecc. - financijska analiza - EXTERNUS CONSULTING Želimir Marojević, mag. ing. aedif. - HIDROING Branimir Barač, mag. ing. aedif. - HIDROING Igor Tadić, mag. ing. aedif. - HIDROING Zoran Vlainić, mag. ing. aedif. - HIDROING Tomislav Kržak, mag. ing. aedif. - HIDROING Hrvoje Barbarić, mag. ing. aedif., HIDROING Date: March 2019. EXECUTIVE: Vjekoslav Abičić, mag.oec. PROJECT FRISCO1 - TECHNICAL SUPPORT FOR THE PREPARATION OF THE CROSS-BORDER COORDINATED COMPREHENSIVE FLOOD PROTECTION STUDY FOR THE DRAVA RIVER BASIN FEASIBILITY STUDY SUMMARY HIDROING d.o.o. OSIJEK STUDIJA O PREKOGRANIČNO USKLAĐENOM UPRAVLJANJU RIZICIMA OD POPLAVA ZA SLIV RIJEKE DRAVE TABLE OF CONTENTS 1 INTRODUCTION ............................................................................................................ 1 1.1 Project location ........................................................................................................ 1 1.2 Objectives of the Feasibility Study ........................................................................... 1 1.3 Activities carried out in the scope of Feasibility Study .............................................. 2 2 HYDRAULIC ANALYSIS AND FLOOD RISK ANALYSIS OF THE EXISTING STATE ... 3 2.1 Hydraulic analysis of the existing state .................................................................... 3 2.2 Flood risk analysis ................................................................................................... 6 2.2.1 Damage assesment methodology .................................................................... 6 2.2.2 Damage assesment for the second phase of the flood risk analysis ................. 6 3 FORMULATION AND ANALYSIS OF ALTERNATIVE SOLUTIONS .............................. 8 3.1 Short-term compontent of measures ....................................................................... 8 3.1.1 Reconstruction of the Otok Virje - Brezje dike (KM1) ........................................ 8 3.1.1.1 Description of the analyzed measure ........................................................ 8 3.1.1.2 Damage estimation and flood risk analysis ...............................................11 3.1.1.3 Investment costs ......................................................................................11 3.1.1.4 Summary of the cost-benefit analysis .......................................................12 3.1.2 Construction of the Mala Vas branch (KM2) ....................................................14 3.1.2.1 Description of the analyzed measure .......................................................14 3.1.2.2 Project benefits ........................................................................................18 3.1.2.3 Investment costs ......................................................................................19 3.1.3 Preparedness of the short-term component projects .......................................20 3.2 Long-term component of measures ........................................................................22 3.2.1 Description of the analyzed measures .............................................................23 3.2.2 Damage assesment ........................................................................................24 3.2.3 Assesment of the construction costs for the long-term measures ....................27 3.2.4 Results of the cost-benefit analysis .................................................................28 4 ENVIRONMENTAL AND NATURE PROTECTION ASPECTS ......................................29 5 SHORT-TERM MEASURES IMPLEMENTATION PLAN ...............................................30 5.1 Evaluation of the Project maturity ...........................................................................30 5.2 Dynamic plan of Project implementation .................................................................30 HIDROING d.o.o. OSIJEK CROSS BORDER COORDINATED COMPREHENSIVE FLOOD PROTECTION STUDY FOR THE DRAVA RIVER BASIN 1 INTRODUCTION 1.1 Project location The area of this project is the Drava river basin between the Markovci dam and Varaždin. The river segment of the joint Croatian-Slovenian interest is from rkm 297 to rkm 322 + 800, in total length 26 km. The catchment area in the Republic of Croatia comprises the northwestern part of the Varaždin County and the western part of the Međimurje County, while in the Republic of Slovenia project area includes the eastern part of the Podravska region and a small part of the southern part of the Pomurska region. The total surface area of the Drava river basin covered by this project is 411.94 km2. Figure 1 Wider area of the Drava River cathcment on the segment of common Croatian-Slovenian interes 1.2 Objectives of the Feasibility Study The main objectives of this Feasibility Study are to identify the optimal variant of long- term flood risk management measures for the target area, the section of the Drava River from Markovci to Varaždin and to verify the feasibility of construction measures, which are to be implemented within the framework of a later construction project (short- FEASIBILITY STUDY SUMMARY 1 HIDROING d.o.o. OSIJEK CROSS BORDER COORDINATED COMPREHENSIVE FLOOD PROTECTION STUDY FOR THE DRAVA RIVER BASIN term measures). As part of this study, potential long-term flood risk mitigation measures, which would be financed from other sources, were also analyzed. 1.3 Activities carried out in the scope of Feasibility Study The activities carried out in the preparation of this feasibility study are described below. A statistical analysis of the water waves of the Drava for the hydrological stations Markovci, Varaždin, Borl, Formin, Videm and Zamušani was made. The results of the statistical analysis were used as input data for the hydraulic model of the river Drava on the section between Markovci dam and Varaždin. The hydraulic analysis was done in two phases. The first phase of hydraulic analysis was carried out based on existing data and existing hydraulic models. The second phase was carried out on the basis of an improved hydraulic model, made in the activity T3.3. Based on the results of the hydraulic analysis, a flood risk analysis (also made in two phases) was performed. In the first stage of flood risk assessment, NACER methodology was used. Based on the results of the first phase, identification of possible measures to reduce the risk of floods was carried out. The verification and final analysis of the proposed measures were carried out on the basis of the results of the second phase of flood risk analysis. In the second phase of flood risk assessment, the Bilateral methodology of economic assessment of flood damage at cross-border basins was used. In total, 12 measures were defined, of which 2 short-term and 10 long-term. Short- term measures are measures that can be implemented through a subsequent project funded under Priority Axis 1 of the Slovenia-Croatia Cross-Border Cooperation Program 2014-2018. INTERRGEG V-A (FRISCO 2). Long-term measures are measures that would be implemented in the future, using other sources of funding. Hydraulic analysis (based on the second phase hydraulic model), risk analysis, and cost estimation were performed for each measure. Cost and Benefit Analysis (CBA) was developed on the basis of risk analysis and cost estimates for each measure. In this Summary the following activities are summarized: Results of the hydraulic analysis and flood risk analysis of the existing state, Analysis of alternative solutions (including description of solutions, risk analysis and CBA analysis), aspects of environmental protection for alternative solutions Short-term measures implementation plan FEASIBILITY STUDY SUMMARY 2 HIDROING d.o.o. OSIJEK CROSS BORDER COORDINATED COMPREHENSIVE FLOOD PROTECTION STUDY FOR THE DRAVA RIVER BASIN 2 HYDRAULIC ANALYSIS AND FLOOD RISK ANALYSIS OF THE EXISTING STATE 2.1 Hydraulic analysis of the existing state The hydraulic modeling of the Drava river in the project area is carried out in two phases. The first phase of hydraulic analysis was carried out based on existing data