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HEC-GeoHMS
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Documentation
The Technical Reference Manual is currently being updated. The
current manual was completed in late 1999 and was intended to
describe Version 2.0.0 through Version 2.2.2. The simulation
components included in the program at that time have not changed and
the manual still describes their technical underpinnings accurately.
However, there are many new simulation methods that are not included
in the manual. The updated manual will add information on all of the
new simulation methods that have been added to the program. The
updated manual will also expand the amount of information for each
method. The goal is to provide complete information on the source
and derivation of the equations used in each method. Information
will also be provided on parameter estimation. Finally, numeric
solution details will be provided on how the equations are solved
inside the program.
The Applications Guide is currently being updated. The current
manual continues to accurately describe how to incorporate
hydrologic simulation into project work. However, Version 3.0.0
through Version 3.3 includes some new features that can make the
work simpler to perform. The manual also includes some screen
pictures that are no longer accurate. The user should be careful to
interpret the current manual in the context of interface changes
made for Version 3.0.0 and newer releases. The updated guide will
include accurate screen pictures and suggestions for better use of
the program to conduct project work.
Software Development
Land surface erosion and channel sediment transport is under
development. Initially two simple methods will be provided for
simulating land surface erosion as part of subbasin calculations.
Eventually more complex methods will be added to the subbasin. A
simplified channel transport capability will be added to reach
elements. It will handle erosion and deposition within the channel
in addition to transport down the channel, all in a simplified
approach appropriate for hydrologic simulation. It is not
anticipated to include a movable bed.
A new water quality capability is in the early planning stages.
Initially it will focus on simulation of nutrient fate and transport
for nitrogen and phosphorus. The initial capability is envisioned to
include a module in the reach for simulating transport and
transformations of the dissolved and particulate forms, plus ways to
specify the boundary conditions at source elements and subbasin
outflows. Later work will add actual simulation modules in the
subbasin to represent the interaction of plant growth, surface
decomposition, and transformations within the soil.
A flexible report generation tool is underdevelopment. It will be
able to produce reports of basin model and meteorologic model input
data, as well as simulation run results. The reports will be based
on a generalized format that can be easily customized both in the
data displayed and the formatting used to display it.