Base flow and surface runoff are two important components that sustain a river or stream. Study was conducted at the Lower Kaduna river catchment, where Kaduna South Water Works was located in Kaduna to estimate the base flow discharge into the Kaduna River. The estimation was done using Local Minimum method of hydrograph separation from stream flow discharge data of thirty years (1977-2006). The total volume of base flow estimated within the period of study was 2.8240 x 1011 m3 representing 15.2% of total stream flow. The year 1984 with lowest stream flow within the reported period has highest base flow contribution with a total value of 9.382 x 109 m3 representing 34.2% of total stream flow for the year, indicating that the river was sustained through by the base flow. The lowest baseflow contribution occurred in 2002 with a value of 5.901 x 109 m3 (6.1%), while the stream flow was ranked first within the period under study. The result was grouped in ten years event, from 1977 to 1986 a sum of 1.084 x 1011 m3 base flow was estimated (19.45%), while from 1987 to 1996 and 1997 to 2006, 9.121 x 1010 m3 and 8.275 x 1010m3 were estimated representing 14.29% and 12.47% respectively. A downward trend in base flow was indicated while stream flow shows an upward trend from the statistical analysis. The research provides a frame of reference for the implementation of groundwater protection, uses, and management plans.
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