Pazhassi Dam

The Pazhassi Dam also called Kulur Barrage is a stone masonry diversion structure in Kannur district, Kerala, India. It is named after king Pazhassi Raja, a patriot who died a heroic death in the war. The dam is constructed across the west flowing Bavali river near Veliyambra. It was commissioned by Prime Minister Morarji Desai in 1979. It mainly functions as an irrigation dam, serving a command area of 11525 ha in Iritty taluk of the Kannur District. The water from this dam also meets the drinking water requirement of Kannur district. The dam site and the reservoir are known for their scenery.

Topography
The dam is built at Kuyiloor across the Bavali River, in the basin of the West flowing rivers from Tadri to Kanyakumari. It rises in the Coorg (in Karnataka) at 2500 ft and drains a catchment area of 1028 km2. The mean annual rainfall in the catchment is 3622 mm. The nearest towns to the dam site are Mattanur and Iritty.

Features
The diversion dam or barrage, built with stone masonry to function as a major irrigation project, is 18.99 m in height and has a length of 245 m. At the Full Reservoir Level of 26.52 m, with a water spread area of 650 ha, the dam has a  gross storage capacity of 97500000 m3. The spillway designed to rout a design flood discharge of 3510 m3 per second is fitted with 16 radial gates over a length of 138 m.

While the dam was completed in 1978, its irrigation component was completed in 1979. The water stored in the reservoir is diverted for irrigation through a control structure on the left bank of the barrage to the main canal of 46.26 km length, designed to carry a discharge of 20 m3 per second. The gross command area under the canal system is 23650 ha with a net command area of 11525 ha (as against the earlier planned figure of 16110 ha) to mainly raise three crops of paddy every year in the Iritty and Taliparamba taluks of Kannur district; other crops grown in the command are coconut, arecanut, cashew nut, tapioca, pepper, ginger, turmeric and vegetables. The network of canals includes six branch canals of 76.35 km total length and 32 distributaries of 136.4 km total length. The entire command is covered under the Command Area Development Programme (CADP) of the Ministry of Water Resources, Government of India and is being monitored since 2003.

Failure of gates
On 7 August 2012, some of the gates of the barrage failed to open, causing the flood waters to overflow the barrage for 20 hours. There was no damage to life or the dam structure, but minor property and crop loss occurred. The gates were repaired at a cost of Rs 70 million.