9 Economic considerations To optimize the net benefits from implementation of waste water reuse, a well designed integrated planning process, as described before is essential. Conceptual level planning for wastewater reuse typically involves definition of the project, cost estimation, and identification of a potential reclaimed water market. Furthermore social and economic benefits of agricultural wastewater reuse have to be assessed (BAHRI A. 1999; HARUVY NAVA 1997,1998; HARUVY ET AL.1999 among other studies). A distinction between economic and financial analysis has to be made. The objective of the economic analyses of wastewater reuse projects is to quantify impacts on society, whereas financial analysis are targeted on the local ability to raise money from project revenues, governmental grants, and loans to pay for the project. o Economic analysis: Focus on the value of resources invested in a project to construct and operate it, measured in monetary terms and computed in terms of present value estimations o Financial analysis: determines if a favoured economic option is financially viable (PORTER, 1984). The marginal financial analysis to be considered consists of the following costs: Capital costs (include leads payments, dept serving), operation and maintenance costs, energy costs, revenue and timing of expenditure and receipts (examples refer to BURGESS, 1991).