Evaluation of Streamflow Partitioning Methods
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Evaluating the relative amounts of stored or moving water via the different components of the
hydrological cycle is highly depended on prudent management and planning. Proper characterization of
hydrological cycle components is even more critical since both water quality and water quantity are considered in
the water management scheme. One of the most challenging parts of this process is the separation and
quantification of baseflow from the streamflow hydrograph.
Streamflow partitioning has long been a topic of interest in the science of hydrology. Baseflow recession
curve itself contains valuable information about ground water flow and it is widely used in hydrological models
such as HEC-1 and other water resource applications. During the last few decades, an important number of case
studies have been made with the aim of identifying the streamflow partitioning and physical factors, which control it.
As a result of the limitation of available data, most of them were developed and tested on specific physiographic
regions. The large number of existing techniques and high level of subjectivity in separating baseflow from
streamflow indicates that the problem is not fully understood.
The purpose of this paper is to review and evaluate the previously developed streamflow partitioning
methods and highlight their advantages and disadvantages. This is important for appropriate use and to avoid any
misuse. Successful application of hydrological models depends on their calibration and validation; therefore, the
main part of this study focuses on the principles governing streamflow separation and its elements.