ABSTRACTAny system, such as an urban cluster, is always embedded in a larger system either in space or time, and each subsystem is affected by both its subscriptions and the large system of which it is a part. Central to this system model is the development of the interactions of these systems with particular regard to resources. This model provides forecasts of the urban cluster as a result of its interactions with other systems and the realization of alternative goals.The Demand Model is composed of an economic, population, reconciliation and life style submodel. The population is forecast for the large system (nation) and disaggregated to the subsystems (regions, state, counties, urban, etc.) based on resource concepts both probable and possible. Transducers are used to describe the life style of urban areas. Again the transducers are goal oriented. Technical coefficients which are also alternative goal oriented are then used to produce individual or total water needs.As a result a demand model which is goal oriented and also applicable to a wide range of supplydemand studies has been developed.
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