The correct option is They do not form any delta..
Explanation
The drainage characteristics of the Western Coastal Plain are primarily determined by the topography of the Western Ghats, which run parallel to the coast and are situated very close to the Arabian Sea.
Analysis of River Characteristics:
- Steep Gradient and Short Course: The Western Ghats act as a water divide. The slope towards the west is very steep, and the coastal plain is narrow. Consequently, rivers flowing westwards are short in length and flow with high velocity.
- Absence of Deltas: Delta formation requires a river to have a long course, a large sediment load, and a gentle gradient near the mouth to allow sediments to settle. The west-flowing rivers move too swiftly to deposit sediments effectively. Therefore, they do not form deltas.
- Formation of Estuaries: Instead of deltas, these rivers form estuaries. An estuary is a funnel-shaped mouth of a river where fresh water mixes with sea water, and tides flush out the sediments.
- Direction of Flow: These rivers drain into the Arabian Sea, whereas rivers flowing into the Bay of Bengal (like the Godavari and Krishna) are long and form extensive deltas.
Key Takeaway: Rivers flowing through the Western Coastal Plain are characterized by their short courses, swift flow, and the formation of estuaries rather than deltas.