Public health determinants consist of wide range of factors which the greatest scope for improving them lays outside the control of the policy makers such as government. Health impact assessment (HIA) is broadly used to identify those activities and policies likely to have significant effects on public health.To identify health determinants which are affected by urban Man-made Lake, a qualitative method was applied. Formatting and weighing the hierarchy of the factors, calculating AHP, and TOPSIS method for deciding and ranking alternatives was used. Results showed that, from two alternatives to construction and non-construction of Man- made Lake, construction was selected. Although decision-makers such as city council persons, zoning commissioners and so forth, typically have little background in health, substantial improvements occur in public health by bringing their attention to the health consequences of their actions.