Restoration work at a stream on the Blickling estate will help improve the water quality of the lake and hopefully lead to the return of plantlife.
Silvergate stream runs for 2km through the north Norfolk estate, feeding the lake before joining the River Bure, a rare chalk stream that feeds into the Norfolk Broads national park.
The work will include channel, pond and floodplain meadow restoration and the creation of silt traps.
National Trust countryside manager Stuart Banks said: 'As well as increasing opportunities for dragonflies and mayflies along the water's edge, improving the water quality will also benefit fish, as well as invertebrates. The hope is that it may even lead to the introduction of the native White Claw Crayfish in the future.'
The work will be paid for thanks to an award of £115,000 from Postcode Earth Trust, which is funded by players of People's Postcode Lottery.
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