From the single hydraulic work to hydrosystem: The case of the hydrologic design of the Evinos works

In the present, many of the major hydraulic works constitute links in wider chains of constructions (hydrosystems) that collaborate to serve one or more purposes. Both design and operation of each such individual work results from the total study of the entire hydrosystem, whereas traditional methodologies, based on the isolation and independent study of partial works are not sufficient. The Evinos works (dam, reservoir, connection tunnel), due to their incorporation in the wider water supply system of Athens, are a typical case where the hydrologic design was performed according to the hydrosystem concept. In this paper, the general considerations and specific techniques followed in the hydrologic design of the Evinos works are summarised, while comparisons with the relatively similar problem of the Acheloos diversion are made.