The publicly-owned company said that a recent burst of rain had not resolved the issue as a sustained period of heavy rainfall was required to start replenishing the reservoirs.
The wet weather was forecast to sweep north into the Highlands with a warning in place of heavy rainfall into Friday morning.
The heavy rainfall accompanies a broad warming trend covering the southeastern United States and reaching into the Midwest, according to the weather service.
"It is expected to continue to move in a westerly direction and bring heavy rainfall to parts of southern Tamil Nadu and Kerala states as it moves towards the Arabian Sea and gradually weakens, " Mr Ferozekhan said.
Scientists have flown into the heart of a turbulent weather system in a bid to uncover the causes of heavy rainfall.
Heavy rainfall or poor drainage systems can trigger a collapse.
The heavy rainfall -- particularly this storm had a lot of rain ahead of it as it was moving ashore -- the concern was where we could expect rainfall.
Last June heavy flooding hit Aberystwyth and nearby villages with a month's rainfall in 24 hours.
Heavy rainfall over the past four days has led to a 5% rise in water stocks, according to Jersey Water.
And the very heavy rainfall, which is the top 1 percent of events, went up at a rate of 20 percent over the 20th century.
"The controls we had put in place were inadequate due to the unusually high rainfall, which resulted in surface water flowing onto a track that was being used by heavy machinery to extract timber from the forest, " added Mr Garson.
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