Multi-Purpose Grade Control
Grade control river structures slow velocities and stabilize a river. A multi-purpose drop replaces formal looking structures with a roughened channel, augmenting natural rock with artificial rock features. The water becomes navigable by native fish and present little risk for responsible boaters and anglers. If a water diversion is included in the design, the intake screen (recent designs patent pending) can be located strategically either upstream of, or actually in the rapid.
Transverse River Stabilization
Several methods used to stabilize and make rivers look natural also improve their ability to convey flood flows. Features are strategically located across the river to promote deeper water and lower bank velocities, discouraging erosion without having to use piles of unsightly riprap.
As time has passed, changing social priorities and technological advances have made the cost of maintaining dams exceed the benefits.Dam removal can help solve problems related to our country’s aging dams. Years ago, dams were often built ignoring the environmental havoc they would create, obstructing the natural trail for fish to find their food or pursue seasonal migration patterns. Many have accumulated sediment that is backing up reservoir levels and increasing the hazards associated with an accidental breach. Many owners are unable to meet the environmental requirements put into place since their construction. Others no longer need them or admit the dams never effectively addressed their stated purpose.
- Kevin Colburn, National Stewardship Director for American Whitewater
Notes Kevin Colburn, National Stewardship Director for American Whitewater, “Many dams are over 100 years old and are simply at the end of their lifetime of structural integrity.”
When a dam can no longer function its removal should be considered. Our team has worked on two such projects for which the end result benefits the long term health of the river:
- Chattahoochee Falls Restoration – Columbus, GA
- Fox River – Batavia, IL