<s>
The	O
Hydrologic	B-Application
Modeling	I-Application
System	I-Application
(	O
HEC-HMS	B-Application
)	O
is	O
designed	O
to	O
simulate	O
the	O
precipitation-runoff	O
processes	O
of	O
dendritic	O
drainage	O
basins	O
.	O
</s>
<s>
Any	O
mass	O
or	O
energy	O
flux	B-General_Concept
in	O
the	O
cycle	O
can	O
then	O
be	O
represented	O
with	O
a	O
mathematical	O
model	O
.	O
</s>
<s>
In	O
most	O
cases	O
,	O
several	O
model	O
choices	O
are	O
available	O
for	O
representing	O
each	O
flux	B-General_Concept
.	O
</s>
<s>
HEC-HMS	B-Application
is	O
a	O
product	O
of	O
the	O
Hydrologic	O
Engineering	O
Center	O
within	O
the	O
U.S.	O
Army	O
Corps	O
of	O
Engineers	O
.	O
</s>
<s>
The	O
program	O
was	O
developed	O
beginning	O
in	O
1992	O
as	O
a	O
replacement	O
for	O
HEC-1	B-Application
which	O
has	O
long	O
been	O
considered	O
a	O
standard	O
for	O
hydrologic	O
simulation	O
.	O
</s>
<s>
The	O
new	O
HEC-HMS	B-Application
provides	O
almost	O
all	O
of	O
the	O
same	O
simulation	O
capabilities	O
,	O
but	O
has	O
modernized	O
them	O
with	O
advances	O
in	O
numerical	B-General_Concept
analysis	I-General_Concept
that	O
take	O
advantage	O
of	O
the	O
significantly	O
faster	O
desktop	O
computers	O
available	O
today	O
.	O
</s>
<s>
It	O
also	O
includes	O
a	O
number	O
of	O
features	O
that	O
were	O
not	O
included	O
in	O
HEC-1	B-Application
,	O
such	O
as	O
continuous	O
simulation	O
and	O
grid	O
cell	O
surface	O
hydrology	O
.	O
</s>
<s>
It	O
also	O
provides	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
to	O
make	O
it	O
easier	O
to	O
use	O
the	O
software	O
.	O
</s>
<s>
GeoHECHMS	O
is	O
a	O
2D/3D	O
visualization	O
and	O
editing	O
data	O
wrapper	O
to	O
the	O
HEC-HMS	B-Application
software	O
and	O
is	O
used	O
for	O
stormwater	O
and	O
flood	O
mitigation	O
engineering	O
studies	O
,	O
including	O
production	O
of	O
Federal	O
Emergency	O
Management	O
Agency	O
flood	O
hazard	O
maps	O
and	O
other	O
river	O
engineering	O
studies	O
,	O
land	O
development	O
projects	O
,	O
and	O
bridge	O
and	O
culvert	O
highway	O
transportation	O
projects	O
.	O
</s>
<s>
Features	O
related	O
to	O
HEC-HMS	B-Application
include	O
:	O
</s>
