AN INTEGRATED SYSTEM FOR THE SUPERVISION AND MANAGEMENT OF THE STREAM NETWORK OF GREATER ATHENS AREA

摘要

In the present paper an integrated system for supervision and management of thestream network of greater Athens area(Attiki) is presented. In 1995, the Water Supplyand Sewerage Authority (EYDAP) focusing in this serious problem of flood protection ofAttiki decided, to create a detailed inventory of the stream network. The study is carriedout by a Corporation of Consultants Engineers and it was completed in the summer of1998.The aim of this study was to develop a supervising and managing system for waterstreams, which represents the actual condition of the hydrological network, estimates itshydrologic and qualitative characteristics, follows its evolution and finally manages theunexpected (e.g. flood) situations in realistic time limits.The recording of streams in Attiki, was structured on a pioneering system ofgeographical data, so that when it will be in use, the stream network will provide fast andeasy access to the users. For the integration of the system Hydrological, HEC-1, andHydraulic, HEC-2, models were used in an interactive way successively for the first timein Greece in conjunction with a Geographical Information System (GIS).The study of the stream network was organized in seven hydrologic and morphologicunits which consists the seven hydrologic compartments. These hydrologiccompartments compose independent elements. Every compartment was divided inwatersheds and every watershed is divided into sub-basins to incrase the accuracy inthe sub-basin simulation. Attiki was distinguished in 160 watersheds The flood dishargewas estimated for different returned time periods (10 20 and 50 years) in a total of 277critical junctions all over the stream network.The integrated approach of the subject, demanded the creation of a general file ofdescriptive and spatial information. The aim was the creation of a geographic data base,in which the data coded and following a well defined hierarchy, from which the automaticextraction of specific hydrological, geological, geographical-administrative informationfor the whole hydrographic network of the area of jurisdiction of EYDAP, would bepossible.The systematization of the recording, in order to acquire a total and complete view of thehydrographic network, required time and a combination of many methods, which alwaysresulted in an autopsy of the field.