Group 3 76 Warehouse, and the archive Dora I suffer periodic floods at least every 10 years. The high frequency of the events indicates that the floods in Trondheim are not caused by climatic extreme events. Floods usually occur in late winter, when heavy rainfall falls, and the ground and gutters are still frozen (Meiforth, 2017). For this reason, it is important to take preventive measures that prevent the deterioration of the affected heritage areas in the long term. Figure 6 also shows the square meters of the Dora 1 archive that have been affected by periodic flooding. Figure 2: Flood zones in Trondheim (forecast in 2100). Flood data obtained from NVE, 2020
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