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Dams fill up after downpour

T. Ramakrishnan

Krishna water augmenting heavy flow into reservoirs from the catchment areas



SURPRISE: Students looking at the level in the Red Hills lake. On Friday morning, Red Hills received nearly 7,700 cubic feet per second. — Photo: S. Thanthoni


CHENNAI: Storage in the city's reservoirs went up by about one thousand million cubic feet (tmcft) on Thursday, and water managers expect to add another one tmcft in a day or two, with reservoirs and catchment areas recording heavy rain.

In the 24-hour-period that ended 8-30 a.m. on Friday, Tiruvallur town, 10 km from the Satyamurti Sagar in Poondi, received 27 cm. Red Hills recorded 24 cm, Chembarampakkam - 23 cm, Tamaraipakkam - 22 cm, Cholavaram 16 cm and Poondi - 12 cm. Zamin Korattur, which contributing flows to Chembarampakkam, registered 16 cm.

Flow will continue

Though the deep depression over the Bay moved northward, the flows in the Kosasthalaiyar river will continue for a few more days, water managers say.

On Friday morning, Red Hills received nearly 7,700 cubic feet per second (cusecs) while Satyamurthi Sagar recorded 3,902 cusecs including 826 cusecs of Krishna water. Cholavaram recorded 2,570 cusecs. Chembarampakkam tank registered over 5,200 cusecs.

On Friday, the Tamaraipakkam anicut (located across Kosathalaiyar), from where the Upper Supply Channel branches off to the Cholavaram tank, overflowed and the downstream Jegannathapuram check dam also reached its full level.

Well fields

This development is encouraging as the flows in the Kosasthalaiyar will directly contribute to recharging of well fields in the northern and northwestern fringes of the city.

The well fields, comprising numerous deep borewells in the Araniar-Kosathalaiyar basin, have been important contributors to the city's water supply as they account for 70 million litres a day, on an average.

In addition to the continuing heavy flow from the local catchment areas, about 750 cusecs of Krishna water is being received by the State at the Zero Point.

October rainfall

The average rainfall at the three reservoirs — Red Hills, Cholavaram and Satyamurti Sagar at Poondi — was 585 mm this month.

The highest rainfall for October in the last four decades was 656 mm in 1969, and the present rainfall is the second best. Till now, the rainfall in October 1972 had the second best tag with 506 mm.

So far, the average rainfall in the reservoirs for 2005 is 1189 mm. The annual normal rainfall is 1,400 mm.

Apart from benefiting the catchment areas of the reservoirs, the depression caused rain mainly in Chennai and neighbourhood.

Ponneri received 20 cm, Nungambakkam -16 cm, Meenambakkam - 15 cm, and Tambaram - 13 cm, besides Cheyyur and Sriperumpudur - 11 cm each.

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