RAINFALL-RUNOFF CORELATION RELATED TO LAND USE IN NYANDO RIVER BASIN

ABSTRACT
The study investigates the effect of change in rainfall on runoff and the effect of land use on
the same. It also involved the determination of rainfall-runoff relationship in the catchment.
A model rainfall-runoff relationship was done by plotting a graph of flow against rainfall on
which a correlation coefficient R2 value was obtained as 0.1547. Only three years in the study
period matched this relationship with the rest being above 40% showing a very strong rainfallrunoff
relationship. The closest rainfall-runoff correlation coefficient was 0.6562 in the year
1993 and the lowest was 0.006 in the year 1986. The relationship was then related to the
changes in land cover over the years. The change in land cover was determined by taking
sample images of various areas in the catchment. The catchment showed significant change
in land use with vegetation giving way to homes, paths, roads and farmlands. This was an
indication as to why the rainfall runoff relationship was increasing.

 

AttachmentSize
OTUNGA ROBERT OKOTH.pdf2.17 MB