Trend Analysis of Hydro-meteorological Data for River Kaduna at Shiroro Dam Site, Niger State Nigeria

Abstract

Variation in the hydro-climatic variables of River Kaduna at Shiroro Dam site, Nigeria is linked to a number of climate change activities around the river. In view of this, the paper aims at examining the trend of stream flow, rainfall, temperature and evaporation. Monthly discharge, rainfall, temperature and evaporation records were obtained for a period of Thirty Three (33) years (1980- 2012). These variables were used to examine the trend of the area. Incremental/Reductional analysis was used to determine a positive and negative change with percentage hydro-climatic variables difference. Mann- Kendall test, Turning point test and Kendall’s Rank Correlation were also used to estimate the significance of the trend. The result of the Mann –Kendall shows that the month of September had a value of Zs equals -2.09 (greater than