Why do the rivers of west coast not form a delta? ( CSE 2006)
The west flowing rivers do not make delta, but estuaries. Many west flowing rivers like Narmada, Tapti, Periar etc passes through rift vallies. This river contains very few amounts of Slits and due to its fast speed it cannot make delta. When these fast flowing rivers reach to its mouth it become unable to deposit its slits, due to this reason slits falls in to the sea.
An ESTUARY is a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea
Estuaries form a transition zone between river environments and ocean environments and are subject to both marine influences, such as tides, waves, and the influx of saline water; and riverine influences, such as flows of fresh water and sediment. The inflow of both seawater and freshwater provide high levels of nutrients in both the water column and sediment, making estuaries among the most productive natural habitats in the world.
There are many small rivers which originate from the western Ghat Mountains and the fall in to the Arabian Sea. Due to the high gradient of Western Ghat these rivers flow with a very high speed and unable to deposits slits. They pass through the hard rocks, these rivers contain very little amount of silts. The estuaries made by these rivers are full of bio-diversity.