SWMM 5.1 Update History
=======================
Engine Updates, more information and code shown on the EPA Website:
1. A new feature
that provides monthly adjustments for
temperature,
evaporation rate, and rainfall was added.
2. Support for
reading the new GHCN-Daily climate data
files
available from NCDC's Climate Data Online service
was added.
3. In addition to
lateral groundwater flow, a custom
equation can
now also be used for seepage flow to
a deeper
groundwater aquifer.
4. The [GW_FLOW]
section of the project file was renamed
to [GWF] and
its format was changed to accommodate
both lateral
and deep groundwater flow equations.
5. A new Weir
parameter was added that specifies if the
weir can surcharge using an orifice equation
or not.
Surcharging
was the only option in SWMM 5.0 but was
switched to no
surcharging in earlier 5.1 releases.
This new
parameter accommodates both closed top weirs
that can
surcharge and open channel weirs that cannot.
6. The formula
used to recover infiltration capacity during
dry periods
for the Modified Horton method was revised.
7. The initial
cumulative infiltration into the upper soil
zone for
Green-Ampt infiltration had been incorrectly
set to the
maximum value instead of zero.
8. All of the
Green-Ampt infiltration functions were
re-factored to
make the code easier to follow.
9. The
calculation of infiltration out of the bottom of a
Bio-Retention
Cell or Permeable Pavement LID unit with a
zero-depth
storage layer was corrected.
10. Most of the
LID simulation routines were modified to
provide more
accurate results under flooded conditions.
11. Results
written to the detailed LID results report now
always
correspond to a full reporting time step.
12. The name of
the variable used to represent the height of
the receiving
channel bottom in a user-defined groundwater
flow equation
was corrected to match the name displayed
in the GUI's
Groundwater Editor dialog (Hcb).
13. A problem with
the program crashing when a climate file
was used to
provide evaporation rates for open channels
and storage
nodes when runoff was not computed (as when
there were no subcatchments in the project)
was fixed.
14. Flow and
pollutant routing mass balance accounting was
modified to
correctly handle negative external inflows.
15. The procedure
for computing the area available for seepage
out of a
storage node that has a tabular storage curve was
corrected.
16. Seepage from
storage units can now be modeled using Green-
Ampt
infiltration, which makes the seepage rate a function
of storage
level. The constant seepage rate option can
still be used
by setting the G-A initial moisture deficit
to 0.
17. The function
that finds depth as a function of volume from
a storage
curve was corrected for the case where the depth
falls within a
portion of the curve where area is constant
with depth
(i.e., vertical side walls).
GUI Updates:
1. The Object
Toolbar was restored.
2. A new page was
added to the Climatology Editor to edit
values for
monthly adjustments for temperature, evaporation,
and rainfall.
3. A field for
the new weir surcharge option was added to the
Weir Property
editor.
4. A problem with
the current project being closed without
asking if it
should be saved first whenever a new style
theme was
selected from the Program Preferences dialog
has been
fixed.
5. The default
seepage rate from an LID storage layer was changed.
6. The
Infiltration Editor was restored for editing Green-Ampt
parameters for
storage unit seepage loss.
7. The
Groundwater Flow Equation Editor was extended to accept
equations for
deep groundwater flow.
History of EPA SWMM versions (from Wikipedia)
