Mr Jenkins said the plant dies down in winter leaving river banks exposed, and any flooding can damage the banks.
He said work could only be carried out during the summer because all weirs had to be fully functional during winter to manage river levels during periods of higher rainfall.
While snowkiting in Utah with a group of Silicon Valley techies last winter, Charles River Ventures Partner Bill Tai was walking around one of the cabins with his iPhone out in front of him.
When the Meuse River froze during winter, resourceful women fried potatoes in place of scarcely available fish.
Next arrived the famous Culatello di Zibello or regional Parma ham aged for one year along the Po River -- an area whose winter fogs and humid summers make the air unlike any other in the world, plus the local Parmigiano Reggiano cheese, aged 30 months.
On his release he began to campaign for a big dam on the Iato river, which roared down in the winter rains and dried up in the nine arid months.
In summer, hikers follow a muddy footpath that parallels the creek, but winter skiers slide directly up the frozen snow-encrusted river in eerie silence.
Its owner and founder, Patrick Cunningham, an entrepreneur with a winter ski rental business, helped establish the now-popular river outings run by a dozen companies from spring through fall.
Once there, you can take hot-air balloon rides over the Sonoran Desert, kayak in the Verde River or tour Frank Lloyd Wright's architectural campus and winter home, Taliesin West.
The farm backs onto the river Severn and lies in its meadows, so the fields receive a good watering every winter.
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