Based on GIS technology

the integrated assessment on flood risk in Hanzhong city in Shaanxi Province was carried out by using administrative county as basic assessment unit. Natural factors including precipitation

precipitation variability

terrain elevation

slope and water system distribution were comprehensively considered in the flood hazard assessment. Socio-economic indicators including population density

annual grain output per unit area and GDP density were analyzed for the flood vulnerability assessment. A map of flood hazard assessment and a map of flood vulnerability assessment are constructed by combining with AHP and GIS technology. Then

superposition analysis method for flood hazard and vulnerability assessment was performed based on GIS technology

and the flood integrated risk assessment of Hanzhong city was obtained. The flood hazard risk of Hanzhong city was concentrated mainly in the Hanzhong basin and declined gradually from basin center to two sides around the main stream. The flood risk level is the highest in the southern part of Hanzhong

in the middle part of Chenggu county and in the northeastern part of Nanzheng county. The low level areas of flood disaster risk were Mian

Xixiang and Yang counties. Liuba county was the lowest in flood hazard risk. The assessment results are corresponding with the flood hazard occurrence in Hanzhong city in 2012

which can provide a scientific basis for making reasonable flood control and mitigation planning in Hanzhong city.