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Determining peak flows for ungaged areas is difficult and involves high uncertainty. Advanced&#x0D;computer capabilities provided by geographical information systems and hydrologic modeling&#x0D;software are used for detailed determination of the parameters involved, both for simple methods as&#x0D;the rational method and more detailed ones as the application of synthetic hydrographs. For the&#x0D;determination of the runoff coefficients and other runoff parameters, digital elevation models were&#x0D;combined with geologic and land use maps in order to extract morphologic and other distributed&#x0D;parameters with the use of GIS for computation of watershed runoff. The discharges were&#x0D;determined by the rational method, the Fuller’s formula and a hydrologic model using synthetic&#x0D;hydrographs according to SCS. A dependable estimate of the design discharge is necessary both for&#x0D;demarcation studies of watercourses and the assessment and management of flood risks according&#x0D;to the guidelines of Directive 2007/60/EC.&#x0D;In this paper a case study in Western Peloponnese is presented. Area specific fitted equations&#x0D;relating the drainage area to the peak flows were developed, that can be used in adjacent regions.&#x0D;The results of the hydrologic studies performed for many geographical units of the new Patra -&#x0D;Pyrgos - Tsakona highway, presently under construction, are analyzed and presented. Results of the&#x0D;rational method and modeling with the HEC-HMS system using SCS hydrographs were compared.&#x0D;Transverse drainage works, where the motorway crosses watercourses, were designed with the 50-&#x0D;yr design discharges determined by the hydrologic model with the use of synthetic hydrographs, lag&#x0D;time and CN, depending on land use, geology and soil cover, determined according to SCS. In the&#x0D;case of bridges with piers the corresponding 100-yr values were used. Differences between the&#x0D;rational method and the hydrologic model are not significant in most cases. Pronounced differences&#x0D;were noticed only in the combined presence of high water transmissivity soils and forest cover.&#x0D;Regional equations were developed for use. In the basins used there are no areas with major urban&#x0D;development or basins with control structures. The equations refer to the 50-yr design flood and can&#x0D;be used in any further computation that may be required in the vicinity without further hydrologic&#x0D;analysis. Comparison with other studies shows good agreement and with similar equations from&#x0D;other projects resemblance.&#x0D;

Systematic approach for ungaged basins’ discharge determination in Western Peloponnese, Greece