Explanation:

Rajrappa Falls has tremendous geographical significance. The Damodar valley at Rajrappa is a typical example of polycyclic valley or topographic discordance which is characterized by two storey valley. The Damodar developed its broad and flat valley of senile stage before the onset of Tertiary upliftment. The river was rejuvenated due to upliftment of landmass during the Paleogene and Neogene Periods (66 million to 1.8 million years ago) by the side effects of the Himalayan orogeny and thus the Damodar excavated its new deep and narrow valley of youthful stage within its broad and flat valley of senile stage. The Bhera river coming from over the Ranchi plateau makes a waterfall while joining the Damodar and thus presents an example of a hanging valley. The Damodar gorge near Rajrappa is a typical example of incised meander.