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Hello, my name is David Anderson, welcome to
understanding drainage systems. I work as the Partner
Support for Region 6 which is the Northeast of the
United States for the National Geospatial Technical
Operations Center in Rolla Missouri. There are many
types of drainage systems that are natural and
dendritic is the most common and that is what you are
going to see today as far as what is contained in the
NHD. They basically are derived from topology of the area, geology, flow of water, and
other items. The NHD allows end users to visualize
these systems almost immediately in most cases and be
able to determine what size of the area is being
drained by these surface water features. This is a
dentritic system that is being shown here. You can see
it looks kind of link a chain of features going down
into the one pour point which is that green dot up
there next to the lake in the Upper Northeast area.
And this is the most common of the drainage systems.
Interbasin connections can either be natural or
man-made. Karst systems are one of the most common
natural ones. They consist of things like sink holes
and springs where the water might disappear into a
groundwater system and then emerge eventually out into
another area. Man-made systems are quite common too
because of our public water drinking systems, ditches
and canals that are meant to re-route any of the
external waters to another area. One of the big ones
is Harold D. Roberts Aqueduct off the Dillon Reservoir
to Denver, or the Catskill Aqueduct off of the Ashokan
Reservoir in New York City that are used for public
water systems. Drainage basins as far as what is the
area of drainage is contained in the NHD and the WBD
features set. These are what some people like to call
hydrologic units and there are three populated feature
classes within the WBD. At the 8-digit, 10-digit, and
12-digit HUC systems. These are basically the
Subbasins, Watersheds, and Subwatersheds that are
populated. If you want to find out where the water is
coming from or how it is getting to an area, you can
use Utility Network Analyst. There are different flags
you can use such as starts, stops, things like that
that you can trace. In this screen-shot I am showing
that you can actually trace the flow uphill and you
will notice that the flow actually extends beyond the
little green flags which is the start and stop of the
Network Utility Analyst and that is because what it is
doing is identifying the whole feature where that
drainage is coming from. So this is how you would use
Utility Network Analyst to map the flow of a specific
area that you want to look at.
Title: Understanding Drainage Systems
Understanding drainage systems also known as Hydrologic Units or HUCs in the National Hydrography Dataset.
Date Taken: 9/1/2011
Video Producer: Kristiana Elite , U.S. Geological Survey, National Geospatial Technical Operations Center (NGTOC), National Hydrography Dataset
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Additional Video Credits:
U.S. Geological Survey
National Geospatial Technical Operations Center (NGTOC)
National Hydrography Dataset
For more information go to: National Hydrography Dataset
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