A rating-curve method for determining debit for dry season in micro-scale watersheds

Abstract

A rating curve discharge are equations which are functions of water level surface with river debit. This equation is needed to determine the river debit if the known data is only the water level surface. There are several methods that could be used to determine the equation including linear, exponential, logarithmic, polynomial of second degree and power-law method. The purpose of this study was to obtain the rating curve equation of relationship between the river water level surface with the debit at the research location. From the research results obtained that the most suitable equation was the second degree polynomial equation, namely: Q = 49.761H2-13.663H + 1.5112 due to its satisfying R2 = 0.818, r = 0.905 and NS = 0.995.