peninsular rivers are not navigable . why?

The rivers of Peninsular India are not suitable for navigation as they flow swiftly over the plateaus and highlands. ... The peninsular rivers of the south have their source in the Western Ghats and flow across hills making a number of waterfalls, which are not navigable, but provide Hydro-electricity.

ryt !!!

They are only navigable in lower courses

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c 

A large number of peninsular rivers are seasonal as the flow of these rivers depend on rain.So these rivers gets dried up during summer season. River beds in these rivers are uneven and rocky . These rivers have Sharp slopes. Construction of dams is difficult hence navigation is not possible.

a. Peninsular rivers rises from the slopes of Western?ghat?and??flow eastwards and drain into the?Bay of Bengal.
b.These rivers are not navigable as they flow in rocky surfaces.
c. It is primarily because?of the rocky terrain in the region in which they flow, these rivers? are not navigable .

The reasons are as follow : (i)These are seasonal rivers which remain dried up in the summer. (ii) River beds are uneven, rocky and have a steep gradients. (iii) Construction of several dams also has made navigation through these rivers impossible