We all live in a watershed, from the heart of Manhatten
to the desert of Arizona. A watershed can be defined as an
area within hydrologic boundaries that drains to a river,
lake, or ocean. For ease of reference, the United State Geologic
Survey (USGS) has classified watersheds into HUCs, or
Hydrologic Unit Codes. The country is divided into 21 regions,
with 2,262 cataloguing units.

With the human population increasing every day, and the
average American using around 70 gallons/day, there is a
need to manage our water resources. This management includes
not only the hydrologic systems such as ground water and
surface water, but also land cover, land use, and human
interactions.