By definition, hydrography
is the study and survey of rivers, streams, creeks, springs, wells, ponds,
lakes, reservoirs, oceans, seas, bays and estuaries with respect to their
tides, flow characteristics, and navigability. Much of the available
hydrographic information is in a format compatible with a GIS such as ArcView.
Locating streams and other water bodies may be essential in creating a
good model.
USGS/EPA NHD (National
Hydrography Dataset) showing stream networks and lakes.

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