1Department of Farm Engineering, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
2ICAR-Indian Institute of Soil & Water Conservation, Dehradun, Uttarakhand, India
*Corresponding author: rajeshyadav04@yahoo.co.in
Online published on 25 August, 2017.
Stream flow is a principal element of the hydrological cycle and its temporal variability is important from both the scientific and practical point of view. In the present study the monthly stream flow trends of 3 gauging stations viz. Kedar, Naula and Sarpdully in Ramganga river catchment were detected using the Mann–Kendall (MK) non parametric test and Sen's slope estimator. For the trend detection of Kedar and Naula gauging stations stream flow data for the period 1973–2012 was used and for Sarpdully the data for the period 1986–2012 was used. Trend estimation with Mann-Kendall non parametric test at 5% level of significance and Sen's slope magnitude were determined for each months. The trend result for Kedar gauging station was found to be negative from January to July and December whereas positive trend was observed during August to November. At Naula gauging station a negative trend was noted in all months whereas at Sarpdully station there was positive trend in all months. Sen's slope estimator indicated increasing and decreasing magnitude of slope during different months.
At Kedar gauging station the MK test for detecting stream flow trend indicated negative trend from January to July and December whereas positive trend was found during August to November.
At Naula station there was negative or decreasing stream flow trend during all months of the year whereas at Sarpdully station positive trend was found during all months.
Sen's slope estimator indicated increasing and decreasing magnitude of slope which was similar to the MK Test.
Mann-Kendall test, non parametric, stream flow, Sen's slope, Ramganga river catchment
