Water resource managers use geographic information
system (GIS) technology to visualize and analyze hydrologic
data for tasks such as assessing water quality, estimating
water availability, planning ood prevention, understanding
the natural environment, and managing water resources.
Arc Hydro is the starting point for water resource analyses
with Esri® ArcGIS® software. Download the free Arc Hydro
data model and tools via the Hydro resource center at