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Abstract
Estimation of Instantaneous Unit Hydrograph with Clark's Technique in GIS
Track: Water Resources
Author(s): Nurunnisa Usul, Musa Yilmaz
Application of Clark's synthetic unit hydrograph technique with GIS technology requires the estimation of three parameters of the original methodology. Time of concentration, Tc, is derived from SCS lag equation, reservoir storage coefficient, R, from an observed storm hydrograph and the time-area histogram is evaluated from the DEM of the basin. The translation hydrograph is then derived from time-area graph by applying a unit excess rainfall over the basin. After performing a linear reservoir routing the translation hydrograph is routed to the basin outlet and the Instantaneous Unit Hydrograph is evaluated. Then this technique can be applied to ungauged basins.
Nurunnisa Usul
Middle East Technical University
Civil Engineering
Su Kaynaklari Lab. Insaat Muh. Bol.
ODTU
Ankara 06531
Turkey
Phone: +903122105448
Fax: +903122101002
E-mail: nurusul@metu.edu.tr
Musa Yilmaz
Middle East Technical University
Civil Engineering
Su Kaynaklari Lab. Insaat Muh. Bol. ODTU
Ankara 06531
Turkey
Phone: +903122102485
Fax: +903122101002
E-mail: musa@metu.edu.tr