National flood discharge mapping in Austria |
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| Authors: | Ralf Merz Günter Blöschl Günter Humer |
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| Institution: | (1) Institute for Hydraulic and Water Resources Engineering, Vienna University of Technology, Karlsplatz 13/222, Vienna, 1040, Austria;(2) Ingenieurbüro DI Günter Humer—Ingenieurbüro f. Kulturtechnik und Wasserwirtschaft, 4682 Geboltskirchen 70, Austria |
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| Abstract: | This article presents the approach and the results of a study in which 30, 100 and 200 year return period flood discharges
were estimated for 26,000 km of Austrian streams. Three guiding principles were adopted: combination of automatic methods
and manual assessments by hydrologists to allow speedy processing and account for the local hydrological situation; combination
of various sources of information including flood peak samples, rainfall data, runoff coefficients and historical flood data;
and involvement of the Hydrographic Services to increase the accuracy and enhance the acceptance of results. The flood discharges
for ungauged catchments were estimated by the Top-kriging approach with manual adjustment to the local flood characteristics.
The adopted combination approach proved to be very efficient both in terms of the project time required and in terms of the
accuracy and acceptability of the estimated flood discharges of given return periods. |
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| Keywords: | Flood Hazard mapping Regionalisation Flood frequency Ungauged catchments |
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