(AP) – Dirt is slowly filling lakes and ponds in Kansas, and experts are divided over how much to worry.

The Wichita Eagle reported that the U.S. Army Corps of Engineers says there is still plenty of room for flood control. But some experts fear the influx of silt will threaten water quality and quantity.

About 60% of Kansans currently get their water from lakes. And that number is expected to grow.

Consider the John Redmond Reservoir, which supplies water to several Kansas towns and the Wolf Creek nuclear plant. It has only about 58% of its original capacity.

The cost of dredging a large reservoir could cost $1 billion. Building a new one would be even more costly and could take 20 years from initial planning to completion.