What is a Watershed?

A watershed is a drainage basin; a bowl-shaped depression where the rim defines the boundaries of the watershed. The bottom of the bowl is our lake. Everything in the basin (or watershed) drains into the lake; lawns, roads, and farm fields, as well as streams and creeks. Homes and businesses impact the watershed by using phosphorus lawn fertilizers and large non-porous surfaces (such as roads and driveways.)

The Delavan Lake Watershed

Delavan Lake is 2,000 acres and the watershed area is 26,000 acres. In comparison, Geneva Lake is 5,200 acres and the watershed is 13,100 acres. You can see from the map with the purple watershed areas we have a very large watershed to protect! See the signs....