They want out of Greece, whose police raid them, forcing them into the sewers and culverts.
Campaign group Rail Future had suggested culverts at the bridge be increased to stop flooding on the line.
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Once used by rafters and home to wild salmon, the river now runs in culverts constrained by highway fortifications.
"The Fish and Wildlife Service is really interested in trout habitat, designing culverts so fish can move to cooler waters, " Prickett said.
It was clear that flood defences held but the culverts were blocked.
The flood alleviation scheme consisted of two parts - work to repair, replace and upsize 600m (660 yards) of culverts beneath the streets of Penrith.
It identifies 149 culverts out of 1.2 million statewide as priority ones to replace with environmentally friendly designs that allow aquatic and other creatures to pass through.
Earnest greens dumped boulders and logs into streams to create natural conditions, while a mile downstream someone else was undoing all that benefit by dredging or laying culverts.
He said he saw residents take chain saws to remove trees that lay across city streets, pile them along the side of the road and clean debris from culverts.
It is also thinking about reintroducing a cap on rupiah accounts held by foreigners, the latest in a series of dykes, bunds and culverts designed to control flows of capital.
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Last week, First Minister Carwyn Jones said there was no need for a public inquiry into the floods, adding that an initial report showed the problem was caused by blocked culverts.
"We've been exploring using culverts as a way to alleviate flooding and protect human safety, as well as helping fish and wildlife, " said Connie Prickett of the Adirondack chapter of The Nature Conservancy.
Mr Millar's call comes after the Environment Agency's initial findings published in December said that culverts around the estate would need to have been 85% blocked in order to cause the flooding.
The federal agency noted that 81 culverts built in southern Alaska to improve salmon passage over the past decade survived last September's 100-year flood in the region, while roads with older, undersized culverts were washed out.
The planned rebuilding of aging or storm-damaged culverts is giving ecologists a rare opportunity to help wildlife expand their range into cooler regions to adapt to climate change by eliminating barriers imposed by highways and poorly designed culverts.
In 2011, severe springtime flooding followed by Hurricane Irene and Tropical Storm Lee in late summer washed out roads throughout mountains of New York and New England as culverts not designed for such enormous volumes of water were overwhelmed.
And the construction of a 76, 000 cubic metre (2.7m cubic feet) flood storage basin upstream of the town, to hold back flood waters and reduce the risk of the culverts overflowing, as well as the wildlife area being developed.
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