Reservoir management ensures KRS fills up ahead of Kabini
However, sources said that this was more due to reservoir management as the outflow from Kabini in H.D. Kote was maintained at a higher level than the rate of inflow.
While the gross storage capacity of the KRS is 49.45 thousand million cubic feet (tmc ft), the storage capacity of the Kabini is 19.52 tmc ft. The storage in Kabini on Sunday, June 29, was 16.39 tmc ft, which is almost 84% of the installed capacity, with the rate of inflow being 20,469 cusecs and outflow being 30,000 cusecs at 6 p.m. on Sunday.
The water level of Kabini was hovering around 2,280 feet against its full level of 2,284 feet as on June 18 according to the Karnataka State Natural Disaster Monitoring Centre (KSNDMC). While the rate of inflow into the reservoir was 21,579 cusecs, the outflow was maintained at around 9,875 cusecs. Incidentally, the storage in Kabini on June 18 was 17.44 tmc ft; had the water been impounded for two more days, the reservoir would have attained its full level of 2,284 ft, making its storage reach 19.52 tmc ft by June 21 or June 22, assuming a rate of inflow of around 20,000 cusecs.
However, the Cauvery Neeravari Nigam Ltd (CNNL) authorities preferred to release the water from the dam, and the outflow has been maintained at a higher rate than the rate of inflow since the last few days.
Sources in the CNNL said the water level at Kabini dam tends to be maintained at less than the optimum level, and a buffer of 2 to 3 feet is preferred for safety purpose.
The catchment area of river Kapila is in the upstream region, encompassing Wayanad in Kerala. Flashfloods or surge in inflow could lead to sudden discharge from Kabini, which could inundate the low lying regions in the downstream of the dam and create havoc, according to officials.
As the KRS was also filling up fast, the authorities thought it would be prudent to release the water from Kabini instead of impounding it. A staggered release was preferable to sudden discharge, the sources added. And with the south west monsoon still active with more rains expected in July and August, there will be more inflow into the dam in the days ahead, the officials said.
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