ADVENTURER Steve Posselt will kayak and walk from Echuca to Melbourne in a bid "to expose the folly" of the north-south pipeline.

The protest comes as conservationists accuse the Victorian Government of being a "Water Wally", saying Melbourne loses 20,000 megalitres annually by logging native forest in the Thomson catchment.

Mr Posselt plans to kayak upstream on the Goulburn River to a site near Yea before walking to Yarra Glen to mirror the lack of logic behind the pipeline.

He said Melbourne should harvest stormwater and recycle more - much more water falls on Melbourne than the city uses, according to Mr Posselt.

He said the Goulburn River was the most stressed in the Murray Darling basin.

"The biggest system in Australia doesn't actually run to the end, it dries out and stops ... it's madness taking more water out of it to put through Melbourne houses, business and factories," Mr Posselt told The Weekly Times.

Water Minister Tim Holding has said the upgrading irrigation systems meant more water for farmers and rivers in the region, not less and claimed Melbourne used twice as much recycled water as any other Australian city.

A spokesman for Environment Minister Gavin Jennings denied 20,0000 megalitres a year was lost to the Thomson Dam because of logging.