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Deep depression likely to cross the coast tonight

T. Ramakrishnan

Sluggish movement makes weathermen revise their forecast

CHENNAI : The "sluggish movement" of the deep depression over southwest Bay of Bengal has forced the Meteorological Department to revise its forecast.

On Sunday, the department said that the system would cross the coast between Cuddalore (in north Tamil Nadu) and Nellore (in south Andhra Pradesh) by Monday night. But, after reviewing the position this morning, the department says the deep depression would cross the coast by Tuesday night.

The department has attributed the change in its forecast to the deep depression remaining virtually stationary. At 8.30 p.m. on Monday, the deep depression lay centred at about 300 km east southeast of Cuddalore. "The system is likely to move in a north-westerly direction," the weather office said.

Rainfall

During the 24-hour period that ended 8-30 a.m. on Monday, Cholavaram and Red Hills, both in Tiruvallur district, recorded 9 cm and 7 cm respectively. Only a few places of north coastal parts of the State received rain. Nungambakkam and Meenambakkam, the two observatories of Chennai, registered 6 cm and 4 cm respectively.

Meanwhile, the Central Groundwater Board, in its analysis of the groundwater position carried out in November, has stated that around 70 per cent of 471 monitoring wells all over the State had recorded rise in water levels, compared to the decadal mean (1995-2004).

The measurement of water levels had been made immediately after the first spell of heavy rain in November. Subsequent spells were not taken into account.

Most of the wells in Chennai, Dharmapuri, Dindigul, Erode, Kancheepuram, Karur, Madurai, Namakkal, Nilgiris, Perambalur, Salem and Tiruvarur reported rise in the levels, ranging from 1 metre to above four metres.

Vellore and Tirunelveli were the two districts that had more wells showing declining trend. Interestingly, the excess rainfall in Vellore this season was not sufficient.

In Sivaganga, Nagapattinam, Virudhu Nagar, Tuticorin, Coimbatore and Cuddalore also, the considerable number of wells (about 33 per cent to 50 per cent) had showed declining trend.

Compared to the groundwater level of May 2005, the position in November revealed that the rise in the level was observed in 79 per cent of the wells.

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