Abstract

Determination of Runoff Coefficient of Basins by Using GIS
Track: Water Resources
Authors: Nurunnisa Usul

Turkey has very different geomorphologic, hydrologic and climatic conditions, so the runoff coefficient should be different from one basin to another. But only one constant value is being used for all the basins in Turkey. In this study, monthly, seasonal and annual runoff coefficients of 48 sub-basins in western and southern part of Anatolia are determined by using synchronous and average rainfall-runoff data. Basin characteristics are determined by using GIS, and areal average precipitations are found by a program written in visual basic language that uses ArcObjects. The Box-Cox transformed data are used in regression analysis. Then, the temporal and spatial distributions of runoff coefficients and their relationship with the basin parameters are investigated. The results revealed that there is not a strong relationship between the basin parameters and runoff coefficients for the whole region, but there are significant relations between them for some basins