3.3 Drainage:
The district has major rivers; the Kagera which marks the north-western border with
Burundi and Rwanda, the Ruvubu river which flow around the southern border and
crosses the district to join Kagera river. Also there are perennial and seasonal rivers
and springs which are marked by the numerous valley bottoms across the district.
3.4 Rainfall:
The rain decreases from north-west to the south-east, ranging from approximately
1300mm to 700mm in the drier southern part of the district. The rainfall pattern shows
a distinct dry season from June to September. However, there is a big variations in
rainfall amount mainly due to high relief intensities, and consequent rain shadow
area.