Water

Ground water

Lakes

Rivers & streams

Watersheds

Wetlands

Watershed Assessment Tool

DNR Division of Waters
(Water Appropriation Permits, Public Waters Work Permits, etc.)

DNR Division of Ecological Services
(Aquatic Plant Control Permits, etc.)

Hydrologic cycle - Where water comes from and where it goes (Pollution Control Agency Web site)
Hydrologic terms - Terms commonly used in hydrology