Group 3 79 overlapping the plan with flood areas, it showed that 23%, 29%, and 33% of the total floor area are at the risk of flood by following the diachronic analysis of flood areas, as it is represented in figure 6. Vulnerability Table 2 shows the vulnerability index and the difference due to defined factors investigated in the three studied cases. The group of warehouses is the most vulnerable (VI= 66%) because nowadays not all of them have an occupation and use. The cathedral is the least vulnerable due to the fact that it is in currently under use every day and hour. Additionally, it is well conserved at national level without improper structural modifications, needs for the installation system. Regarding the degree of conservation, it has low vulnerability. The Cathedral is not in a flood-risk zone, so besides the least vulnerability there is no exposure to the flood hazard. Table 2: Vulnerability matrix and Vulnerability Index (VI) of Warehouses, Cathedral and Dora I. Vulnerability Factors Warehouses Cathedral Dora Current occupation and use 3 1 1 Heritage Value 1 1 2 Structural modifications 2 2 2 Maintenance for Installation system 2 1 1 Degree of conservation 2 1 1 Vulnerability Index 66,67% 40,00% 46,67% Table 3 show the vulnerability indexes of the possible five scenarios of warehouses. The most vulnerable is vacant situation without any function (VI= 86,67%) and hotel comes after with the value of 60,00%. The vulnerability by structural modifications increases particularly in the hotel and museum scenarios because there are more needs to intervene within the original building in order to meet nowadays’ legal requirements for these novel functions e.g., fire protection, emergency exits, and daylight. All the vulnerability factors, except structural modification, is highest in the scenario where the warehouses are not used. On the other hand, VI decreases in the scenarios where warehouses are re-functioned as offices, hotels. According to this matrix, the least vulnerable scenarios are the functions of museums, community center, and offices. Table 3: Vulnerability Matrix and VI for the hypothetical scenarios
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