As an important part of resilience, disaster prevention and mitigation capabilities of the exposure units are a key consideration in disaster economic loss assessment. Based on the data collected from Lizhong Town in the Lixiahe region of Jiangsu Province, the initial depth-damage scatter diagrams and fitted curves were drawn for residential property, industrial property, business, infrastructure, and agriculture. Then the modified depth-damage scatter diagrams and fitted curves in line with the actual damage situation were drawn by taking into consideration disaster prevention and mitigation capabilities. The results show that: (1) At the significance level of 0.05, the correlation between submersion depth and depth-damage rate under different scenarios for residential property, industrial property, business, infrastructure, and agriculture is a power function; (2) Taking into consideration disaster prevention and mitigation capabilities, economic losses of different exposure units caused by flood disaster decreased. Residential property flood losses were reduced by 34% at the submersion depth of 3 m; industrial property losses were reduced by 17% at the submersion depth of 2 m; business losses were reduced by 24% at the submersion depth of 3 m; and infrastructure losses were reduced by 11% at the submersion depth of 2 m. The influence of disaster prevention and mitigation capabilities on residential property flood losses was most obvious. This study may serve as a useful supplement for research on flood depth-damage relation and provide references for disaster prevention and mitigation decisions and disaster risk management in similar areas.
