(i) Some rivers are habitat to dangerous animals like hippos and crocodiles which may attack human beings or destroy crops.
(ii) River water can be a medium of spreading water-borne diseases since flood waters may spread chemicals from farms or human waste which contaminates sources of water.
(iii) When rivers flood, they destroy a lot of property or crops and may displace people leading to loss of human life.
(iv) Deep or wide rivers are a barrier to transport especially where bridges have not been constructed.
maurice.mutuku answered the question on June 7, 2017 at 13:02
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