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giswr
> events
> 1st nhda symposium
> tuesday >
nhd flow volume & velocity estimation
NHD Flow Volume and Velocity
Estimation
In order to model the transport and fate of contaminants
in streams using the National Hydrography Dataset (NHD),
it is necessary to have flow and velocity estimates for
each NHD reach segment. To meet this requirement, a project
has been initiated to develop estimates of mean annual flow
and velocity, mean monthly flow, and corresponding high
and low estimates for each item. The project will employ
a hybrid deterministic/statistical approach that meets these
qualifications. It is expected that NHD flow and velocity
estimates will be closely integrated with water quality
models. To facilitate this integration, it is imperative
that the water quality models and the method for estimating
flow and velocity share a consistent framework. The digital
elevation model used to define basins for individual NHD
reach segments should provide such a framework. This presentation
will discuss the approach, status and plans for estimating
NHD flow volume and velocity.
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