The city of Kenai has been working on a way to stabilize its eroding bluffs for nigh on four decades. The city is now in the final phase of pre-construction design before being able to lock down funding and potentially get the project on the ground.
The bluffs that the city of Kenai sits on have been eroding, badly, for years. As the groundwater goes out, it pushes material out of the bluff to the bottom, where the river perpetually washes it away, accelerating the erosion. If the material falling out could build up, it could establish a slope over time that plants could grow on, making a more stable bluff that could in turn protect the buildings on top from tumbling into the river.