How Water Moves Across Landscapes

A watershed—also called a catchment—is the living system that gathers, stores, and moves water across the landscape. It is defined not by political boundaries, but by gravity: every drop of rain or snowmelt flows downhill, following the contours of land, into streams, wetlands, rivers, and eventually to a shared outlet such as a lake. Everything within that boundary is connected by the way water moves.

Water doesn’t just flow on the surface. Some of it soaks into the ground, where it feeds plants and slowly moves underground. Wetlands and low areas act like natural storage spaces, holding water during wet times and releasing it slowly during dry periods. This helps reduce flooding and keeps streams flowing longer.

People also affect how water moves. Roads, drainage systems, and land use can speed water up or block its natural paths. In some cases, this can lead to flooding or dry areas. By restoring wetlands, improving crossings like culverts, and working with natural systems, communities can help water move more naturally and support healthier landscapes.