Shaping a baseflow model through multiple regression analysis: the coruh watershed example

In today's conditions, where the frequency of events related to global climate change is increasing, it is important to employ water science to utilize water with maximum efficiency and to keep water under control in the areas close to its consumption zone. It is also important to determine how much of the flow in the stream during dry periods is the baseflow and how much of it is direct flow. This study designed a model of the baseflow index (BFI) and the baseflow rate (Q(b)) in one of the watersheds in Turkey. The smoothed minima method designed by the United Kingdom Institute of Hydrology (UKIH) was used to calculate the BFI and Q(b) at 10 flow observation stations in the Coruh watershed. The Coruh Watershed Baseflow Model was designed using BFI and Q(b) values with watershed characteristics and other variables. The determination coefficient of the BFI model was calculated as R-2 = 0.842, and the Q(b) model determination coefficient was calculated as R-2 = 0.99. The usability of the Coruh model was proven by using the UKIH's smoothed minima method and comparing its relative errors with the BFI and Q(b) in the Coruh model. HIGHLIGHTS