Analysis on fuzzy risk of water resources - a case study of Jinhua City

Jinhua city suffers from uneven precipitation, river water pollution and a lack of water storage projects. The problem of water shortages is becoming increasingly severe. We can obtain a conservative risk value, a venture risk value and a maximum probability risk value. Under such an a level, three risk values can be calculated. As a adopts all values throughout the set [0, 1], it is possible to obtain a series of risk values. Therefore, the fuzzy risk can be a multi-valued risk or set-valued risk. Calculation of the fuzzy expected value of Jinhua city´s water resource risk has been performed based on the interior-outer set model. Selection of an a value depends on the confidence in different groups of people.