The University of Nairobi held its annual tree planting at Ngong hills over looking the beautiful Nairobi city on one side and the vast rift Vally on the other. Ngong hill forms the catchment of Ngong river- which flows through the city of Nairobi and drain into the greater Athi river that flows to Indian Ocean. Recent floods in Nairobi showed the limitations of the city in managing such water flows from the mountain. This can be assosiated to the increased deforestation and the encroachment of riparian reserves by rogue constructions. The University of Nairbo hopes to continue support the plight of environmental conservation not only through research but also through action.