Author(s):

Sourabh Das, Rajesh Singh and VK Pandey

Abstract: The present study was carried out at Rispana River milli watershed located in Uttarakhand state. The Rispana river which is a tributaries of Ganga, flows from Mussoorie and passes through Dehradun. Rispana river catchment in different aspects of hydro-meteorological investigation, which include estimation of long-term annual and seasonal rainfall departure, probability distribution analysis of annual and seasonal rainfall, analysis of annual and analysis of seasonal meteorological drought years for the period of 1985 to 2018. The average annual, seasonal (Jun-Sep), and non-seasonal (Oct-May) rainfall of study area was found to be 2169.1 mm, 1877.6 mm and 291.5 mm respectively. It was also found that the highest annual rainfall deficiency in drought year was -25% (in 1988), -27% (in 1991), -28% (in 2002),-25% (in 2009) and -30% (in 2016). In case of seasonal rainfall, the highest rainfall deficiency in drought year was -30% (in 1986), -29% (in 1991), -36% (in 2002), -31% (in 2009), -27% (in 2016) and -25% (in 2017).The Rainfall departure indicated that the highest annual rainfall year was 37% (in1990), 25% (in 1997), 36% (in 1998), 50% (in 2010) and 51% (in 2013). In case of seasonal rainfall (Jun- September) highest rainfall deficiency year was 30% (in 1990), 28% (in 1999), 26% (in 2007), 63% (in 2010), 29% (in 2011) and 53% (in 2013).

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