Thottappally Spillway

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Thottappally Spillway is Kuttanad's drain-way out to the Arabian Sea. The Thottappally Spillway splits the Thottappally lake with the fresh water part to the east and saline Thottappally river mouth to the west merging with the Arabian Sea. Thottappally spillway is constructed to spill excess water coming over the Upper Kuttanad and Lower Kuttanad regions through Manimala River, Achancovil River and Pamba River. It is designed such that it could spill off 19,500 cubic meters of water per second, but after its construction it was found that it is able to spill 600 cubic meters of water per second. Reasons for this reduced flow rate are, strong sea breezes during rainy seasons resulting in a rise in sea level relative to the water level of Kuttanad, formation of sand bars on the western area of the spillway and the width of the leading canal is too narrow to carry this much water to the spillway. [1]

Arabian Sea A marginal sea of the northern Indian Ocean between the Arabian Peninsula and India

The Arabian Sea is a region of the northern Indian Ocean bounded on the north by Pakistan and Iran, on the west by the Gulf of Aden, Guardafui Channel and the Arabian Peninsula, on the southeast by the Laccadive Sea, on the southwest by the Somali Sea, and on the east by India. Its total area is 3,862,000 km2 (1,491,000 sq mi) and its maximum depth is 4,652 metres (15,262 ft). The Gulf of Aden in the west, connects the Arabian Sea to the Red Sea through the strait of Bab-el-Mandeb, and the Gulf of Oman is in the northwest, connecting it to the Persian Gulf.

Upper Kuttanad is a part of India's Kuttanad region. It consists of parts of Kottayam, Pathanamthitta, and Alapuzha districts.

Lower Kuttanad comprises taluks of Ambalapuzha, Kuttanad and northern half of Karthikapally taluk in Alappuzha district, Kerala, India.


Spillway work forms part of the Kuttanad development scheme included in the first five year national plan. Spill way was inaugurated by Sri. Pattom Thanupillai on 5 December 1955.

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  1. Kuttanad 1992 Published by Kerala Sasthrasahithya Parishat