-It interferes with the water animals (marine life) which cannot cross the barrier dam
-The calm waters encourage breeding of mosquitoes and bilharzias snails
-It segregates people who were neighbours due to resettlement in higher grounds
-Forms a barrier thus hindering transportation across the valley
-It covers most of the fertile farmlands along the river valley
-High water loss through evaporation due to the exposure of large water surface to direct sunrays
maurice.mutuku answered the question on August 16, 2019 at 06:13
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