A widely used application for environmental water is to raise water levels in rivers and weirs to inundate new hard surfaces to grow new biofilms.

Source: https://phys.org/news/2023-10-slime-biofilms-rivers-vitally-important.html

The cost of this bike-path “project” would instead, if it was spent on the actual river course, make a magnificent start to dredging the river and putting in “weirs” to make the river look like something to be proud of.

Source: https://miamivalleytoday.com/bike-path-planned-for-south-side-of-river-a-mistake/