Craig Woolhouse, from the Environment Agency, told ITV News the work would start on the 5 mile stretch of waterway affecting Curry Moor and Northmoor.
The Prime Minister has confirmed that dredging of the rivers on the Somerset Levels will begin in March.
David Cameron told a meeting of MPs in Bridgwater that dredging notices had gone out for work to begin.
But the Environment Agency said the work will only take place when it is "safe and practical to do so".
Dredging will take place on eight kilometres of river channel where the Tone and Parrett meet at Burrowbridge. Work will start on a 200 metre long stretch of the river Parrett north of Coates Farm.
This is a key stretch of the river that has been specifically identified by local people for dredging and where significant amounts of silt have built up.
Clearing this length provides the greatest flood reduction benefits through dredging for local villages, farmers and transport routes.
Work will be ready to start by the end of March provided water levels drop and the banks and adjacent land is dry enough for the specialist contractors’ excavators to work safely.
David Cameron inspected the high pressure Dutch pumps, visited Sedgemoor Council's headquarter in Bridgwater and explained to our Political Correspondent Bob Constantine, that it would take six weeks to drain the Somerset Levels.