"Entire trees come down the Jones Falls," he said, requiring a larger collection device.
The new wheel will only have to contend with the plastic bottles, cigarette butts, and other small pieces of waste that make it down Harris Creek, which flows through underground pipes in Southeast Baltimore.
The smaller workload will mean the new contraption will work faster than the first.
"We're trading strength for speed," Lindquist said.
But like its predecessor, he said, the second device will be powered by a water wheel and solar panels.