Research on Risk Assessment and Control for Urban Rainwater Resources Utilization

Strengthening risk management and control of urban rainwater resources utilization is the key to ensuring the sustainable and efficient use of urban rainwater resources. On the basis of comprehensive research on urban rainwater utilization, the definition and connotation of urban rainwater utilization emphasizing the attributes of resource utilization are proposed, and the definition and function model of urban rainwater utilization risk are established. Based on the whole process of the development and utilization of urban rainwater resources including external environment, urban natural and social characteristics, rainwater utilization engineering systems, and project operation management, the risk assessment index system for urban rainwater utilization and risk evaluation model by using Analytic Hierarchy Process are established, and a comprehensive risk assessment standard based on risk value and risk tolerance, as well as residual risk management and control theory and risk management methods are put forward. The results of research on risk assessment and control of rainwater resources utilization in Xifeng District of Qingyang City shows that the main risks of rainwater utilization in this district are as follows in order of severity: policies and regulations, economy developing level, maintenance costs, precipitation and natural eutrophication. Risk assessment shows that the risks are low and acceptable and thus can be reduced by strengthening daily monitoring and control.